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Created March 19, 2026 14:40
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What's new in Remotion - Editing with Claude Code
Raw
conversation.txt
╭─── Claude Code v2.1.79 ──────────────────────────────────────────────────────╮
│ │ Tips for getting │
│ Welcome back Jonny! │ started │
│ │ Run /init to create a … │
│ ▐▛███▜▌ │ ─────────────────────── │
│ ▝▜█████▛▘ │ Recent activity │
│ ▘▘ ▝▝ │ No recent activity │
│ Opus 4.6 (1M context) · Claude Max · │ │
│ jonny@remotion.dev's Organization │ │
│ ~/whats-new │ │
╰──────────────────────────────────────────────────────────────────────────────╯
❯ look at /Users/jonathanburger/Movies, import all files starting with "whats"
into the public folder.
Read 2 files (ctrl+o to expand)
⏺ Found 11 .mov files (whats1.mov through whats11.mov). I'll copy them all into
the public folder.
⏺ Bash(cp /Users/jonathanburger/Movies/whats*.mov
/Users/jonathanburger/whats-new/public/)
⎿  Done
Read 1 file (ctrl+o to expand)
⏺ All 11 files copied to public/ (~660MB total):
- whats1.mov through whats11.mov
❯ then, use remotion best practices and put them in a series
⏺ Let me first understand the current project structure, then apply Remotion
best practices.
⏺ Skill(remotion-best-practices)
⎿  Successfully loaded skill
⏺ Explore(Explore project structure)
⎿  Done (16 tool uses · 18.5k tokens · 22s)
(ctrl+o to expand)
⏺ Let me read the relevant Remotion rules for this task.
Read 6 files (ctrl+o to expand)
⏺ Now let me read the current source files and install the required package.
Read 3 files (ctrl+o to expand)
⏺ Bash(npx remotion add @remotion/media 2>&1)
⎿  Error: Exit code 1
npm error could not determine executable to run
npm error A complete log of this run can be found in:
/Users/jonathanburger/.npm/_logs/2026-03-19T08_18_28_862Z-debug-0.log
⏺ Bash(npx remotion add @remotion/media 2>&1)
⎿  Error: Exit code 1
npm error could not determine executable to run
npm error A complete log of this run can be found in:
/Users/jonathanburger/.npm/_logs/2026-03-19T08_18_35_911Z-debug-0.log
⏺ Bash(ls node_modules/.bin/remotion* 2>/dev/null; which remotion 2>/dev/null;
npm ls remotion 2>&1 | head -5)
⎿  (eval):1: no matches found: node_modules/.bin/remotion*
remotion not found
whats-new@1.0.0 /Users/jonathanburger/whats-new
└── (empty)
⏺ Bash(npm install 2>&1 | tail -5)
⎿  To address all issues, run:
npm audit fix --force
Run `npm audit` for details.
⏺ Bash(npx remotion add @remotion/media 2>&1)
⎿  Installing @remotion/media
$ npm i --save-exact --no-fund --no-audit @remotion/media@4.0.436
… +2 lines (ctrl+o to expand)
⏺ Now let me also install mediabunny for getting video durations, and read the
FFmpeg rules for silence detection.
⏺ Bash(npm install --save-exact mediabunny 2>&1)
⎿  added 4 packages, changed 1 package, and audited 334 packages in 626ms
69 packages are looking for funding
… +8 lines (ctrl+o to expand)
Read 1 file (ctrl+o to expand)
⏺ Now let me detect silences in all the video files using FFmpeg, then build the
Series composition with trimming.
⏺ Bash(for i in 1 2 3 4 5 6 7 8 9 10 11; do echo "=== whats${i}.mov ==="; npx
remotion ffprobe -i /Users/jonathanburger/whats-new/public/whats${i}.mov
2>&1 | grep -E "…)
⎿  === whats1.mov ===
Duration: 00:00:05.92, start: 0.000000, bitrate: 17252 kb/s
Stream #0:0[0x1](und): Audio: pcm_f32le (lpcm / 0x6D63706C), 48000 H
… +34 lines (ctrl+o to expand)
⏺ Bash(for i in 1 2 3 4 5 6 7 8 9 10 11; do echo "=== whats${i}.mov ==="; npx
remotion ffmpeg -i /Users/jonathanburger/whats-new/public/whats${i}.mov
-af silencedetect…)
⎿  Error: Exit code 1
=== whats1.mov ===
=== whats2.mov ===
=== whats3.mov ===
=== whats4.mov ===
=== whats5.mov ===
=== whats6.mov ===
=== whats7.mov ===
=== whats8.mov ===
=== whats9.mov ===
… +2 lines (ctrl+o to see all)
⏺ No silences detected at -30dB. Let me try a higher threshold.
⏺ Bash(for i in 1 2 3 4 5 6 7 8 9 10 11; do echo "=== whats${i}.mov ==="; npx
remotion ffmpeg -i /Users/jonathanburger/whats-new/public/whats${i}.mov
-af silencedetect…)
⎿  Error: Exit code 1
=== whats1.mov ===
=== whats2.mov ===
=== whats3.mov ===
=== whats4.mov ===
=== whats5.mov ===
=== whats6.mov ===
=== whats7.mov ===
=== whats8.mov ===
=== whats9.mov ===
… +2 lines (ctrl+o to see all)
⏺ Bash(npx remotion ffmpeg -i /Users/jonathanburger/whats-new/public/whats1.mov
-af volumedetect -f null - 2>&1 | grep -E "mean_volume|max_volume")
⎿  No matches found
⏺ Bash(npx remotion ffmpeg -i /Users/jonathanburger/whats-new/public/whats1.mov
-af volumedetect -f null - 2>&1)
⎿  Error: Exit code 8
ffmpeg version n7.1 Copyright (c) 2000-2024 the FFmpeg developers
built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)
configuration: --prefix=remotion --extra-cflags='-Iremotion/include
-Iremotion/include/opus -Iremotion/include/lame -Iremotion/include/vpx'
--extra-ldflags='-Lremotion/lib -Wl' --enable-small --enable-shared
--enable-libdav1d --enable-libzimg --enable-libfdk-aac --disable-static
--disable-ffplay --disable-postproc --disable-filters --disable-libxcb
--enable-filter=aformat --enable-filter=atrim --enable-filter=acopy
--enable-filter=adelay --enable-filter=anullsrc --enable-filter=atempo
--enable-filter=apad --enable-filter=amerge --enable-filter=amix
--enable-filter=asetrate --enable-filter=asetpts --enable-filter=aresample
--enable-filter=concat --enable-filter=loudnorm --enable-filter=colorspace
--enable-filter=tinterlace --enable-filter=fieldorder --enable-filter=pan
--enable-filter=volume --enable-filter=scale --enable-filter=sine
--enable-filter=split --enable-filter=nullsrc --enable-filter=silencedetect
--enable-filter=palettegen --enable-filter=paletteuse
--enable-filter=zscale --enable-filter=tonemap --enable-filter=copy
--disable-doc --enable-gpl --enable-nonfree --disable-encoders
--enable-encoder=opus --enable-encoder=aac --enable-encoder=libfdk_aac
--enable-encoder=png --enable-encoder=mjpeg --enable-encoder=pcm_s16le
--enable-encoder=pcm_s24le --enable-encoder=libx264
--enable-encoder=libx265 --enable-libvpx --enable-encoder=libvpx_vp8
--enable-encoder=libvpx_vp9 --enable-encoder=gif
--enable-encoder=libmp3lame --enable-encoder=libopus
--enable-encoder=prores_ks --enable-encoder=rawvideo --enable-videotoolbox
--enable-encoder=h264_videotoolbox --enable-encoder=hevc_videotoolbox
--enable-encoder=prores_videotoolbox --disable-muxers
--enable-muxer='webm,opus,mp4,wav,mp3,mov,matroska,hevc,h264,gif,image2,ima
ge2pipe,adts,m4a,mpegts,null,avi' --enable-libx264 --enable-libx265
--enable-libmp3lame --enable-zlib --enable-libopus --disable-demuxers
--disable-sdl2 --disable-xlib --enable-demuxer='aac,av1,avi,caf,concat,flac
,flv,h264,hevc,image2,image2pipe,matroska,mov,mp3,ogg,pcm_f32le,pcm_f32be,p
cm_f64le,pcm_f64be,pcm_s16be,pcm_s16le,pcm_s24be,pcm_s24le,pcm_s32be,pcm_s3
2le,pcm_u16be,pcm_u16le,pcm_u24le,pcm_u24be,pcm_u32be,pcm_u32le,wav,gif,hls
,m4a,mpeg2_videotoolbox,mpeg4_videotoolbox' --disable-decoders
--enable-decoder='aac,ac3,av1,flac,h264,hevc,libvpx_vp8,libvpx_vp9,vp8,vp9,
mp3,mpeg4,opus,pcm_u8,pcm_f16le,pcm_f24le,pcm_f32le,pcm_f32be,pcm_f64le,pcm
_f64be,pcm_s16be,pcm_s16le,pcm_s24be,pcm_s24le,pcm_s32be,pcm_s32le,pcm_s64b
e,pcm_s64le,pcm_u16be,pcm_u16le,pcm_u24le,pcm_u24be,pcm_u32be,pcm_u32le,pro
res,theora,vorbis,vp9,mjpeg,gif,png,libdav1d,hls,m4a,rawvideo,h264_videotoo
lbox,hevc_videotoolbox'
libavutil 59. 39.100 / 59. 39.100
libavcodec 61. 19.100 / 61. 19.100
libavformat 61. 7.100 / 61. 7.100
libavdevice 61. 3.100 / 61. 3.100
libavfilter 10. 4.100 / 10. 4.100
libswscale 8. 3.100 / 8. 3.100
… +25 lines (ctrl+o to see all)
⏺ Bash(for i in 1 2 3 4 5 6 7 8 9 10 11; do echo "=== whats${i}.mov ==="; npx
remotion ffmpeg -i /Users/jonathanburger/whats-new/public/whats${i}.mov
-map 0:a -af sile…)
⎿  === whats1.mov ===
[silencedetect @ 0x600000eec240] silence_start: 0
[silencedetect @ 0x600000eec240] silence_end: 1.3305 | silence_duratio
… +211 lines (ctrl+o to expand)
⏺ I have all the silence data. Now I'll build the composition with a <Series>,
trimming leading and trailing silences from each video.
⏺ Write(src/get-video-duration.ts)
⎿  Wrote 13 lines to src/get-video-duration.ts
1 import { Input, ALL_FORMATS, UrlSource } from "mediabunny";
2
3 export const getVideoDuration = async (src: string) => {
4 const input = new Input({
5 formats: ALL_FORMATS,
6 source: new UrlSource(src, {
7 getRetryDelay: () => null,
8 }),
9 });
… +3 lines (ctrl+o to expand)
⏺ Write(src/Composition.tsx)
⎿  Added 58 lines, removed 1 line
1 +import { AbsoluteFill, Series, staticFile, useVideoConfig } fro
+m "remotion";
2 +import { Video } from "@remotion/media";
3 +
4 +const VIDEO_FILES = [
5 + "whats1.mov",
6 + "whats2.mov",
7 + "whats3.mov",
8 + "whats4.mov",
9 + "whats5.mov",
10 + "whats6.mov",
11 + "whats7.mov",
12 + "whats8.mov",
13 + "whats9.mov",
14 + "whats10.mov",
15 + "whats11.mov",
16 +];
17 +
18 +// Leading silence end (seconds) and trailing silence start (se
+conds) for each video
19 +// Detected via ffmpeg silencedetect (noise=-30dB, d=0.5)
20 +const SILENCES: Record<string, { leadingEnd: number; trailingSt
+art: number }> =
21 + {
22 + "whats1.mov": { leadingEnd: 1.33, trailingStart: 4.03 },
23 + "whats2.mov": { leadingEnd: 0.65, trailingStart: 29.81 },
24 + "whats3.mov": { leadingEnd: 3.39, trailingStart: 45.02 },
25 + "whats4.mov": { leadingEnd: 2.3, trailingStart: 38.25 },
26 + "whats5.mov": { leadingEnd: 3.14, trailingStart: 24.74 },
27 + "whats6.mov": { leadingEnd: 2.47, trailingStart: 31.31 },
28 + "whats7.mov": { leadingEnd: 4.35, trailingStart: 38.56 },
29 + "whats8.mov": { leadingEnd: 2.74, trailingStart: 27.51 },
30 + "whats9.mov": { leadingEnd: 1.85, trailingStart: 17.39 },
31 + "whats10.mov": { leadingEnd: 1.9, trailingStart: 15.66 },
32 + "whats11.mov": { leadingEnd: 3.3, trailingStart: 26.6 },
33 + };
34 +
35 export const MyComposition = () => {
2 - return null;
36 + const { fps } = useVideoConfig();
37 +
38 + return (
39 + <AbsoluteFill style={{ backgroundColor: "black" }}>
40 + <Series>
41 + {VIDEO_FILES.map((file) => {
42 + const silence = SILENCES[file];
43 + const trimBefore = Math.floor(silence.leadingEnd * fp
+s);
44 + const trimAfter = Math.ceil(silence.trailingStart * f
+ps);
45 + const durationInFrames = trimAfter - trimBefore;
46 +
47 + return (
48 + <Series.Sequence key={file} durationInFrames={durat
+ionInFrames}>
49 + <Video
50 + src={staticFile(file)}
51 + trimBefore={trimBefore}
52 + trimAfter={trimAfter}
53 + />
54 + </Series.Sequence>
55 + );
56 + })}
57 + </Series>
58 + </AbsoluteFill>
59 + );
60 };
⏺ Write(src/Root.tsx)
⎿  Added 58 lines, removed 6 lines
1 import "./index.css";
2 -import { Composition } from "remotion";
2 +import { Composition, CalculateMetadataFunction, staticFile } f
+rom "remotion";
3 import { MyComposition } from "./Composition";
4 +import { getVideoDuration } from "./get-video-duration";
5
6 +const VIDEO_FILES = [
7 + "whats1.mov",
8 + "whats2.mov",
9 + "whats3.mov",
10 + "whats4.mov",
11 + "whats5.mov",
12 + "whats6.mov",
13 + "whats7.mov",
14 + "whats8.mov",
15 + "whats9.mov",
16 + "whats10.mov",
17 + "whats11.mov",
18 +];
19 +
20 +const SILENCES: Record<string, { leadingEnd: number; trailingSt
+art: number }> =
21 + {
22 + "whats1.mov": { leadingEnd: 1.33, trailingStart: 4.03 },
23 + "whats2.mov": { leadingEnd: 0.65, trailingStart: 29.81 },
24 + "whats3.mov": { leadingEnd: 3.39, trailingStart: 45.02 },
25 + "whats4.mov": { leadingEnd: 2.3, trailingStart: 38.25 },
26 + "whats5.mov": { leadingEnd: 3.14, trailingStart: 24.74 },
27 + "whats6.mov": { leadingEnd: 2.47, trailingStart: 31.31 },
28 + "whats7.mov": { leadingEnd: 4.35, trailingStart: 38.56 },
29 + "whats8.mov": { leadingEnd: 2.74, trailingStart: 27.51 },
30 + "whats9.mov": { leadingEnd: 1.85, trailingStart: 17.39 },
31 + "whats10.mov": { leadingEnd: 1.9, trailingStart: 15.66 },
32 + "whats11.mov": { leadingEnd: 3.3, trailingStart: 26.6 },
33 + };
34 +
35 +const FPS = 30;
36 +
37 +const calculateMetadata: CalculateMetadataFunction<
38 + Record<string, unknown>
39 +> = async () => {
40 + const durations = await Promise.all(
41 + VIDEO_FILES.map((file) => getVideoDuration(staticFile(file)
+)),
42 + );
43 +
44 + let totalFrames = 0;
45 + for (let i = 0; i < VIDEO_FILES.length; i++) {
46 + const silence = SILENCES[VIDEO_FILES[i]];
47 + const trimmedDuration = silence.trailingStart - silence.lea
+dingEnd;
48 + totalFrames += Math.ceil(trimmedDuration * FPS);
49 + }
50 +
51 + return {
52 + durationInFrames: totalFrames,
53 + };
54 +};
55 +
56 export const RemotionRoot: React.FC = () => {
57 return (
58 <>
59 <Composition
9 - id="MyComp"
60 + id="WhatsNew"
61 component={MyComposition}
11 - durationInFrames={60}
12 - fps={30}
13 - width={1280}
14 - height={720}
62 + durationInFrames={300}
63 + fps={FPS}
64 + width={1920}
65 + height={1080}
66 + calculateMetadata={calculateMetadata}
67 />
68 </>
69 );
⏺ Now let me verify it compiles:
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  Error: Exit code 2
src/Root.tsx(40,9): error TS6133: 'durations' is declared but its value is
never read.
⏺ Update(src/Root.tsx)
⎿  Removed 4 lines
37 const calculateMetadata: CalculateMetadataFunction<
38 Record<string, unknown>
39 > = async () => {
40 - const durations = await Promise.all(
41 - VIDEO_FILES.map((file) => getVideoDuration(staticFile(file)
-)),
42 - );
43 -
40 let totalFrames = 0;
41 for (let i = 0; i < VIDEO_FILES.length; i++) {
42 const silence = SILENCES[VIDEO_FILES[i]];
⏺ Update(src/Root.tsx)
⎿  Added 1 line, removed 2 lines
1 import "./index.css";
2 -import { Composition, CalculateMetadataFunction, staticFile } fr
-om "remotion";
2 +import { Composition, CalculateMetadataFunction } from "remotion
+";
3 import { MyComposition } from "./Composition";
4 -import { getVideoDuration } from "./get-video-duration";
4
5 const VIDEO_FILES = [
6 "whats1.mov",
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Type checks pass. Here's what I set up:
src/Composition.tsx — Uses <Series> to play all 11 videos sequentially. Each
<Series.Sequence> wraps a <Video> with trimBefore/trimAfter to cut the leading
and trailing silences detected by FFmpeg.
src/Root.tsx — Defines a WhatsNew composition at 1920x1080, 30fps, with
calculateMetadata that computes the total duration from the trimmed lengths.
Silence trimming — Each video's leading silence (starts at 0) and trailing
silence (extends to the end) were detected using ffmpeg silencedetect at
-30dB/0.5s threshold. The trim points are stored in a SILENCES map and applied
via Remotion's non-destructive trimBefore/trimAfter props.
✻ Churned for 3m 31s
❯ I wanna improve the silence detection.
for whats1-what5, can you rerun it with ffmpeg and tell me which command you
used?
⏺ Bash(for i in 1 2 3 4 5; do echo "=== whats${i}.mov ==="; echo "Command: npx
remotion ffmpeg -i public/whats${i}.mov -map 0:a -af
silencedetect=noise=-30dB:d=0.5 -f…)
⎿  === whats1.mov ===
Command: npx remotion ffmpeg -i public/whats1.mov -map 0:a -af silence
detect=noise=-30dB:d=0.5 -f null /dev/null
… +106 lines (ctrl+o to expand)
⏺ The command used was:
npx remotion ffmpeg -i public/whatsX.mov -map 0:a -af
silencedetect=noise=-30dB:d=0.5 -f null /dev/null
Here's a summary for each file:
whats1.mov (5.92s total):
- Leading: 0 → 1.33s
- Trailing: 4.03 → 5.89s
whats2.mov (33.05s total):
- Leading: 0 → 0.65s, then another silence 0.67 → 6.53s (essentially
continuous leading silence until ~6.5s)
- Trailing: 29.81 → 33.03s
whats3.mov (45.55s total):
- Leading: 0 → 3.39s
- Trailing: 43.49 → 44.96s, then 45.02 → 45.52s (essentially continuous
trailing silence from ~43.5s)
whats4.mov (40.40s total):
- Leading: 0 → 2.30s
- Trailing: 38.25 → 40.40s
whats5.mov (27.14s total):
- Leading: 0 → 3.14s
- Trailing: 24.74 → 27.10s (with nearby silences starting at 23.11 and 23.92)
Would you like to adjust the trim points for any of these, or try different
detection parameters (e.g. different noise threshold or minimum duration)?
❯ I'm wondering if this works well for any video.
wouldn't it be better to first detect the overall volume of the video first,
and then based on that try to find the silence?
⏺ Good thinking. Let me check what volume measurement is available in this
FFmpeg build and measure the loudness of each video.
⏺ Bash(for i in 1 2 3 4 5; do echo "=== whats${i}.mov ==="; npx remotion ffmpeg
-i /Users/jonathanburger/whats-new/public/whats${i}.mov -map 0:a -af
loudnorm=print_for…)
⎿  === whats1.mov ===
"input_i" : "-33.77",
"input_tp" : "-17.64",
… +31 lines (ctrl+o to expand)
⏺ Interesting. The key values:
┌────────┬──────────────────────────────┬──────────────────────────────────┐
│ Video │ Integrated Loudness │ Loudness Threshold │
│ │ (input_i) │ (input_thresh) │
├────────┼──────────────────────────────┼──────────────────────────────────┤
│ whats1 │ -33.77 dB │ -45.72 dB │
├────────┼──────────────────────────────┼──────────────────────────────────┤
│ whats2 │ -34.29 dB │ -45.44 dB │
├────────┼──────────────────────────────┼──────────────────────────────────┤
│ whats3 │ -32.84 dB │ -43.82 dB │
├────────┼──────────────────────────────┼──────────────────────────────────┤
│ whats4 │ -33.78 dB │ -44.70 dB │
├────────┼──────────────────────────────┼──────────────────────────────────┤
│ whats5 │ -33.29 dB │ -44.58 dB │
└────────┴──────────────────────────────┴──────────────────────────────────┘
The input_thresh is the EBU R128 gating threshold — it's the level below which
audio is considered "too quiet to count" toward the integrated loudness. This
is actually a great adaptive baseline for silence detection.
The approach would be: instead of a fixed -30dB threshold, use each video's
input_thresh (or something relative to input_i) as the silencedetect noise
floor. That way a quieter recording doesn't get its speech clipped, and a
louder one still catches true silence.
For these videos they're all fairly similar (~-33 to -34 dB integrated, ~-44
to -46 dB threshold), so -30dB was actually already above the speech level,
which is why it worked. But for a video with very different levels, it could
miss or over-trim.
Want me to build a script that:
1. Runs loudnorm first to get input_thresh per video
2. Uses that threshold (or a value relative to input_i, e.g. input_i - 15dB)
as the silencedetect noise parameter
3. Outputs the updated silence map?
✻ Baked for 31s
❯ recalculate the leadingEnd and trailing start offsets for this video, I wanna
see what the result would be like
⏺ Bash(for i in 1 2 3 4 5 6 7 8 9 10 11; do
echo "=== whats${i}.mov ==="…)
⎿  === whats1.mov ===
input_thresh: -45.72 dB
[silencedetect @ 0x6000012501e0] silence_start: 0.643625
… +107 lines (ctrl+o to expand)
⏺ Here are the results using each video's own loudness threshold (input_thresh)
from EBU R128:
┌─────────┬───────────┬──────────────────────┬──────────────┬────────────┐
│ │ │ │ Trailing │ Duration │
│ Video │ Threshold │ Leading silence ends │ silence │ (total) │
│ │ │ │ starts │ │
├─────────┼───────────┼──────────────────────┼──────────────┼────────────┤
│ whats1 │ -45.72 dB │ 0.64s (no silence at │ 4.57s │ 5.92s │
│ │ │ 0!) │ │ │
├─────────┼───────────┼──────────────────────┼──────────────┼────────────┤
│ │ │ 6.47s (gap at │ │ │
│ whats2 │ -45.44 dB │ 0.63-1.14, then │ 31.13s │ 33.05s │
│ │ │ silent to 6.47) │ │ │
├─────────┼───────────┼──────────────────────┼──────────────┼────────────┤
│ whats3 │ -43.82 dB │ 2.89s (0→0.99, │ 43.81s │ 45.55s │
│ │ │ 1.27→2.89) │ │ │
├─────────┼───────────┼──────────────────────┼──────────────┼────────────┤
│ whats4 │ -44.70 dB │ 2.24s │ 38.77s │ 40.40s │
├─────────┼───────────┼──────────────────────┼──────────────┼────────────┤
│ whats5 │ -44.58 dB │ 3.04s (0→2.14, │ 25.31s │ 27.14s │
│ │ │ 2.14→3.04) │ │ │
├─────────┼───────────┼──────────────────────┼──────────────┼────────────┤
│ whats6 │ -44.70 dB │ 2.32s (0→1.67, │ 31.64s │ 33.09s │
│ │ │ 1.67→2.32) │ │ │
├─────────┼───────────┼──────────────────────┼──────────────┼────────────┤
│ whats7 │ -44.34 dB │ 4.21s │ 39.27s │ 40.07s │
├─────────┼───────────┼──────────────────────┼──────────────┼────────────┤
│ whats8 │ -45.00 dB │ none (first silence │ 28.47s │ 30.08s │
│ │ │ at 1.54s) │ │ │
├─────────┼───────────┼──────────────────────┼──────────────┼────────────┤
│ whats9 │ -44.76 dB │ 1.85s (starts at │ 17.95s │ 19.69s │
│ │ │ 0.22, not 0) │ │ │
├─────────┼───────────┼──────────────────────┼──────────────┼────────────┤
│ whats10 │ -44.34 dB │ 1.84s (0→1.23, │ 15.85s │ 17.25s │
│ │ │ 1.23→1.84) │ │ │
├─────────┼───────────┼──────────────────────┼──────────────┼────────────┤
│ whats11 │ -45.69 dB │ 3.27s (0→0.65, │ 27.52s │ 29.28s │
│ │ │ 0.65→3.27) │ │ │
└─────────┴───────────┴──────────────────────┴──────────────┴────────────┘
Notable differences from the fixed -30dB approach:
- whats1: no leading silence detected at all (sound starts at 0, first silence
is mid-video at 0.64s)
- whats8: no leading silence (first silence starts at 1.54s)
- whats9: leading silence doesn't start at 0 either (starts at 0.22s)
- Generally tighter trailing trims since the adaptive threshold is more
permissive
Want me to update the SILENCES map in Composition.tsx with these new values?
✻ Crunched for 40s
❯ yes
Read 1 file (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 12 lines, removed 12 lines
16 ];
17
18 // Leading silence end (seconds) and trailing silence start (se
conds) for each video
19 -// Detected via ffmpeg silencedetect (noise=-30dB, d=0.5)
19 +// Detected via ffmpeg silencedetect using adaptive per-video E
+BU R128 loudness threshold
20 const SILENCES: Record<string, { leadingEnd: number; trailingSt
art: number }> =
21 {
22 - "whats1.mov": { leadingEnd: 1, trailingStart: 4.83 },
23 - "whats2.mov": { leadingEnd: 6, trailingStart: 31.81 },
24 - "whats3.mov": { leadingEnd: 3.3, trailingStart: 44.52 },
25 - "whats4.mov": { leadingEnd: 2.3, trailingStart: 39.55 },
26 - "whats5.mov": { leadingEnd: 3.14, trailingStart: 24.74 },
27 - "whats6.mov": { leadingEnd: 2.47, trailingStart: 31.31 },
28 - "whats7.mov": { leadingEnd: 4.35, trailingStart: 38.56 },
29 - "whats8.mov": { leadingEnd: 2.74, trailingStart: 27.51 },
30 - "whats9.mov": { leadingEnd: 1.85, trailingStart: 17.39 },
31 - "whats10.mov": { leadingEnd: 1.9, trailingStart: 15.66 },
32 - "whats11.mov": { leadingEnd: 3.3, trailingStart: 26.6 },
22 + "whats1.mov": { leadingEnd: 0, trailingStart: 4.57 },
23 + "whats2.mov": { leadingEnd: 6.47, trailingStart: 31.13 },
24 + "whats3.mov": { leadingEnd: 2.89, trailingStart: 43.81 },
25 + "whats4.mov": { leadingEnd: 2.24, trailingStart: 38.77 },
26 + "whats5.mov": { leadingEnd: 3.04, trailingStart: 25.31 },
27 + "whats6.mov": { leadingEnd: 2.32, trailingStart: 31.64 },
28 + "whats7.mov": { leadingEnd: 4.21, trailingStart: 39.27 },
29 + "whats8.mov": { leadingEnd: 0, trailingStart: 28.47 },
30 + "whats9.mov": { leadingEnd: 0, trailingStart: 17.95 },
31 + "whats10.mov": { leadingEnd: 1.84, trailingStart: 15.85 },
32 + "whats11.mov": { leadingEnd: 3.27, trailingStart: 27.52 },
33 };
34
35 export const MyComposition = () => {
⏺ Now update the matching values in Root.tsx for the duration calculation.
Read 1 file (ctrl+o to expand)
⏺ Update(src/Root.tsx)
⎿  Added 11 lines, removed 11 lines
18
19 const SILENCES: Record<string, { leadingEnd: number; trailingSt
art: number }> =
20 {
21 - "whats1.mov": { leadingEnd: 1.33, trailingStart: 4.03 },
22 - "whats2.mov": { leadingEnd: 0.65, trailingStart: 29.81 },
23 - "whats3.mov": { leadingEnd: 3.39, trailingStart: 45.02 },
24 - "whats4.mov": { leadingEnd: 2.3, trailingStart: 38.25 },
25 - "whats5.mov": { leadingEnd: 3.14, trailingStart: 24.74 },
26 - "whats6.mov": { leadingEnd: 2.47, trailingStart: 31.31 },
27 - "whats7.mov": { leadingEnd: 4.35, trailingStart: 38.56 },
28 - "whats8.mov": { leadingEnd: 2.74, trailingStart: 27.51 },
29 - "whats9.mov": { leadingEnd: 1.85, trailingStart: 17.39 },
30 - "whats10.mov": { leadingEnd: 1.9, trailingStart: 15.66 },
31 - "whats11.mov": { leadingEnd: 3.3, trailingStart: 26.6 },
21 + "whats1.mov": { leadingEnd: 0, trailingStart: 4.57 },
22 + "whats2.mov": { leadingEnd: 6.47, trailingStart: 31.13 },
23 + "whats3.mov": { leadingEnd: 2.89, trailingStart: 43.81 },
24 + "whats4.mov": { leadingEnd: 2.24, trailingStart: 38.77 },
25 + "whats5.mov": { leadingEnd: 3.04, trailingStart: 25.31 },
26 + "whats6.mov": { leadingEnd: 2.32, trailingStart: 31.64 },
27 + "whats7.mov": { leadingEnd: 4.21, trailingStart: 39.27 },
28 + "whats8.mov": { leadingEnd: 0, trailingStart: 28.47 },
29 + "whats9.mov": { leadingEnd: 0, trailingStart: 17.95 },
30 + "whats10.mov": { leadingEnd: 1.84, trailingStart: 15.85 },
31 + "whats11.mov": { leadingEnd: 3.27, trailingStart: 27.52 },
32 };
33
34 const FPS = 30;
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Both Composition.tsx and Root.tsx are updated with the adaptive silence
values. Videos 1, 8, and 9 now have leadingEnd: 0 since no leading silence was
detected at their actual loudness threshold.
✻ Cooked for 1m 8s
❯ it's pretty good.
in .agents/skills/remotion-best-practices, can you write a new
silence-detection skill that works like this.
it should reference the ffmpeg skill.
also reference it in SKILL.md
Searched for 1 pattern, read 2 files (ctrl+o to expand)
⏺ Write(.claude/skills/remotion-best-practices/rules/silence-detection.md)
⎿  Wrote 101 lines to
.claude/skills/remotion-best-practices/rules/silence-detection.md
1 ---
2 name: silence-detection
3 description: Adaptive silence detection for video/audio files us
ing FFmpeg loudnorm and silencedetect
4 metadata:
5 tags: silence, detection, trimming, ffmpeg, loudnorm, audio
6 ---
7
8 # Adaptive Silence Detection
9
10 Detect silent segments in video or audio files using a two-step
approach: first measure the file's overall loudness, then use th
at as an adaptive threshold for silence detection. This avoids f
alse positives from a fixed threshold on quiet recordings or mis
sed silences on loud ones.
… +91 lines (ctrl+o to expand)
⏺ Now add it to SKILL.md:
⏺ Update(.claude/skills/remotion-best-practices/SKILL.md)
⎿  Added 4 lines
17
18 For some video operations, such as trimming videos or detecting
silence, FFmpeg should be used. Load the [./rules/ffmpeg.md](.
/rules/ffmpeg.md) file for more information.
19
20 +## Silence detection
21 +
22 +When needing to detect and trim silent segments from video or a
+udio files, load the [./rules/silence-detection.md](./rules/sil
+ence-detection.md) file. It uses adaptive per-file loudness thr
+esholds (EBU R128) for accurate results across recordings with
+different volume levels. Requires FFmpeg — see [./rules/ffmpeg.
+md](./rules/ffmpeg.md).
23 +
24 ## Audio visualization
25
26 When needing to visualize audio (spectrum bars, waveforms, bass
-reactive effects), load the [./rules/audio-visualization.md](.
/rules/audio-visualization.md) file for more information.
⏺ Update(.claude/skills/remotion-best-practices/SKILL.md)
⎿  Added 1 line
60 - [rules/transparent-videos.md](rules/transparent-videos.md) -
Rendering out a video with transparency
61 - [rules/trimming.md](rules/trimming.md) - Trimming patterns fo
r Remotion - cut the beginning or end of animations
62 - [rules/videos.md](rules/videos.md) - Embedding videos in Remo
tion - trimming, volume, speed, looping, pitch
63 +- [rules/silence-detection.md](rules/silence-detection.md) - Ad
+aptive silence detection using FFmpeg loudnorm and silencedetec
+t
64 - [rules/parameters.md](rules/parameters.md) - Make a video par
ametrizable by adding a Zod schema
65 - [rules/maps.md](rules/maps.md) - Add a map using Mapbox and a
nimate it
66 - [rules/voiceover.md](rules/voiceover.md) - Adding AI-generate
d voiceover to Remotion compositions using ElevenLabs TTS
⏺ Done. Created rules/silence-detection.md with the two-step adaptive approach
(loudnorm threshold + silencedetect), and referenced it in SKILL.md in both
the top-level section and the rules index.
✻ Worked for 51s
❯ make calculatemetadata based on the trims
Read 2 files (ctrl+o to expand)
⏺ The SILENCES and VIDEO_FILES are duplicated between both files. Let me
consolidate — export them from Composition.tsx and use them in Root.tsx.
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
1 import { AbsoluteFill, Series, staticFile, useVideoConfig } from
"remotion";
2 import { Video } from "@remotion/media";
3
4 -const VIDEO_FILES = [
4 +export const VIDEO_FILES = [
5 "whats1.mov",
6 "whats2.mov",
7 "whats3.mov",
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
17
18 // Leading silence end (seconds) and trailing silence start (se
conds) for each video
19 // Detected via ffmpeg silencedetect using adaptive per-video E
BU R128 loudness threshold
20 -const SILENCES: Record<string, { leadingEnd: number; trailingSt
-art: number }> =
20 +export const SILENCES: Record<string, { leadingEnd: number; tra
+ilingStart: number }> =
21 {
22 "whats1.mov": { leadingEnd: 0, trailingStart: 4.57 },
23 "whats2.mov": { leadingEnd: 6.47, trailingStart: 31.13 },
⏺ Write(src/Root.tsx)
⎿  Added 6 lines, removed 34 lines
1 import "./index.css";
2 import { Composition, CalculateMetadataFunction } from "remotio
n";
3 -import { MyComposition } from "./Composition";
3 +import { MyComposition, VIDEO_FILES, SILENCES } from "./Composi
+tion";
4
5 -const VIDEO_FILES = [
6 - "whats1.mov",
7 - "whats2.mov",
8 - "whats3.mov",
9 - "whats4.mov",
10 - "whats5.mov",
11 - "whats6.mov",
12 - "whats7.mov",
13 - "whats8.mov",
14 - "whats9.mov",
15 - "whats10.mov",
16 - "whats11.mov",
17 -];
18 -
19 -const SILENCES: Record<string, { leadingEnd: number; trailingSt
-art: number }> =
20 - {
21 - "whats1.mov": { leadingEnd: 0, trailingStart: 4.57 },
22 - "whats2.mov": { leadingEnd: 6.47, trailingStart: 31.13 },
23 - "whats3.mov": { leadingEnd: 2.89, trailingStart: 43.81 },
24 - "whats4.mov": { leadingEnd: 2.24, trailingStart: 38.77 },
25 - "whats5.mov": { leadingEnd: 3.04, trailingStart: 25.31 },
26 - "whats6.mov": { leadingEnd: 2.32, trailingStart: 31.64 },
27 - "whats7.mov": { leadingEnd: 4.21, trailingStart: 39.27 },
28 - "whats8.mov": { leadingEnd: 0, trailingStart: 28.47 },
29 - "whats9.mov": { leadingEnd: 0, trailingStart: 17.95 },
30 - "whats10.mov": { leadingEnd: 1.84, trailingStart: 15.85 },
31 - "whats11.mov": { leadingEnd: 3.27, trailingStart: 27.52 },
32 - };
33 -
5 const FPS = 30;
6
7 const calculateMetadata: CalculateMetadataFunction<
8 Record<string, unknown>
9 > = async () => {
10 let totalFrames = 0;
40 - for (let i = 0; i < VIDEO_FILES.length; i++) {
41 - const silence = SILENCES[VIDEO_FILES[i]];
42 - const trimmedDuration = silence.trailingStart - silence.lea
-dingEnd;
43 - totalFrames += Math.ceil(trimmedDuration * FPS);
11 + for (const file of VIDEO_FILES) {
12 + const silence = SILENCES[file];
13 + const trimBefore = Math.floor(silence.leadingEnd * FPS);
14 + const trimAfter = Math.ceil(silence.trailingStart * FPS);
15 + totalFrames += trimAfter - trimBefore;
16 }
17
18 return {
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. calculateMetadata now computes the total duration using the same
Math.floor/Math.ceil frame rounding as the <Series.Sequence> in
Composition.tsx, and both files share the same VIDEO_FILES and SILENCES
exports — no more duplication.
❯ I wanna start adding various overlays to the scenes.
in scene 1, start sliding in a div from the right until it takes half of the
composition.
the video should slide to the left as well, but only half as much so the
speaker stays centered in the left half.
make this go for 5 seconds, then unroll the animation. use appropriate easings
for sliding in and out
Read 3 files (ctrl+o to expand)
⏺ I'll extract Scene 1 into its own component with the slide-in overlay
animation.
⏺ Write(src/Scene1.tsx)
⎿  Wrote 85 lines to src/Scene1.tsx
1 import {
2 AbsoluteFill,
3 Easing,
4 interpolate,
5 staticFile,
6 useCurrentFrame,
7 useVideoConfig,
8 } from "remotion";
9 import { Video } from "@remotion/media";
10 import { SILENCES } from "./Composition";
… +75 lines (ctrl+o to expand)
⏺ Now update Composition.tsx to use Scene1 for the first video:
⏺ Update(src/Composition.tsx)
⎿  Added 1 line
1 import { AbsoluteFill, Series, staticFile, useVideoConfig } from
"remotion";
2 import { Video } from "@remotion/media";
3 +import { Scene1 } from "./Scene1";
4
5 export const VIDEO_FILES = [
6 "whats1.mov",
⏺ Update(src/Composition.tsx)
⎿  Added 9 lines, removed 6 lines
47
48 return (
49 <Series.Sequence key={file} durationInFrames={durat
ionInFrames} premountFor={30}>
50 - <Video
51 - src={staticFile(file)}
52 - trimBefore={trimBefore}
53 - trimAfter={trimAfter}
54 -
55 - />
50 + {file === "whats1.mov" ? (
51 + <Scene1 />
52 + ) : (
53 + <Video
54 + src={staticFile(file)}
55 + trimBefore={trimBefore}
56 + trimAfter={trimAfter}
57 + />
58 + )}
59 </Series.Sequence>
60 );
61 })}
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Scene1.tsx handles whats1.mov with:
- Video: shifts left by 25% so the speaker stays centered in the left half
- Overlay: a white div covering the right 50%, slides in from offscreen right
- Timing: slide-in starts at 0.5s, takes 0.8s, holds for 5s, then slides back
out over 0.8s
- Easing: Easing.inOut(Easing.quad) for smooth acceleration/deceleration on
both in and out
✻ Cooked for 38s
❯ sorry, this was meant for scene 2
⏺ Bash(mv /Users/jonathanburger/whats-new/src/Scene1.tsx
/Users/jonathanburger/whats-new/src/Scene2.tsx)
⎿  Done
⏺ Update(src/Scene2.tsx)
⎿  File must be read first
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene2.tsx)
⎿  Added 2 lines, removed 2 lines
9 import { Video } from "@remotion/media";
10 import { SILENCES } from "./Composition";
11
12 -const FILE = "whats1.mov";
12 +const FILE = "whats2.mov";
13
14 -export const Scene1: React.FC = () => {
14 +export const Scene2: React.FC = () => {
15 const frame = useCurrentFrame();
16 const { fps } = useVideoConfig();
17 const silence = SILENCES[FILE];
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
1 import { AbsoluteFill, Series, staticFile, useVideoConfig } from
"remotion";
2 import { Video } from "@remotion/media";
3 -import { Scene1 } from "./Scene1";
3 +import { Scene2 } from "./Scene2";
4
5 export const VIDEO_FILES = [
6 "whats1.mov",
⏺ Update(src/Composition.tsx)
⎿  Added 2 lines, removed 2 lines
47
48 return (
49 <Series.Sequence key={file} durationInFrames={durat
ionInFrames} premountFor={30}>
50 - {file === "whats1.mov" ? (
51 - <Scene1 />
50 + {file === "whats2.mov" ? (
51 + <Scene2 />
52 ) : (
53 <Video
54 src={staticFile(file)}
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Renamed to Scene2.tsx / Scene2, now targeting whats2.mov, and wired up
in the Series.
✻ Worked for 30s
❯ make it only stay 3.5 seconds.
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
19 const trimAfter = Math.ceil(silence.trailingStart * fps);
20
21 const slideInDuration = 0.8 * fps;
22 - const holdDuration = 5 * fps;
22 + const holdDuration = 3.5 * fps;
23 const slideOutDuration = 0.8 * fps;
24 const slideInStart = 0.5 * fps;
25 const slideOutStart = slideInStart + slideInDuration + holdDu
ration;
⏺ Done.
❯ make the entry and leave transitions faster.
⏺ Update(src/Scene2.tsx)
⎿  Added 2 lines, removed 2 lines
18 const trimBefore = Math.floor(silence.leadingEnd * fps);
19 const trimAfter = Math.ceil(silence.trailingStart * fps);
20
21 - const slideInDuration = 0.8 * fps;
21 + const slideInDuration = 0.4 * fps;
22 const holdDuration = 3.5 * fps;
23 - const slideOutDuration = 0.8 * fps;
23 + const slideOutDuration = 0.4 * fps;
24 const slideInStart = 0.5 * fps;
25 const slideOutStart = slideInStart + slideInDuration + holdDu
ration;
26
⏺ Done. Slide in and out are now 0.4s each (was 0.8s).
❯ add a whoosh sound effect wiht volume 0.3 when entering
Searched for 1 pattern, read 2 files (ctrl+o to expand)
⏺ I need a whoosh sound effect file. Let me find a free one to download.
⏺ Web Search("free whoosh sound effect mp3 download")
⎿  Did 1 search in 7s
⎿  Interrupted · What should Claude do instead?
❯ use remotion best practices for the sound effect
⏺ Skill(remotion-best-practices)
⎿  Successfully loaded skill
Searched for 1 pattern (ctrl+o to expand)
⏺ The sound-effects rule file doesn't exist yet. Let me check if there's a
@remotion/sound-effects or similar package.
⏺ Web Search("remotion sound effects @remotion/sfx package 2026")
⎿  Did 1 search in 4s
⏺ Fetch(https://www.remotion.dev/docs/contributing/sfx)
⎿  Received 897 bytes (200 OK)
⏺ Fetch(https://www.remotion.dev/docs/sfx)
⎿  Received 601 bytes (200 OK)
⏺ Bash(npm install --save-exact @remotion/sfx 2>&1 | tail -3)
⎿  Interrupted · What should Claude do instead?
❯ it is a mistake in the skill, it is in sfx.md
Read 1 file (ctrl+o to expand)
⏺ Now let me add the whoosh sound to Scene2.
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
6 useCurrentFrame,
7 useVideoConfig,
8 } from "remotion";
9 -import { Video } from "@remotion/media";
9 +import { Audio, Video } from "@remotion/media";
10 import { SILENCES } from "./Composition";
11
12 const FILE = "whats2.mov";
⏺ Update(src/Scene2.tsx)
⎿  Added 3 lines
61
62 return (
63 <AbsoluteFill>
64 + <Sequence from={Math.floor(slideInStart)} layout="none">
65 + <Audio src="https://remotion.media/whoosh.wav" volume={
+0.3} />
66 + </Sequence>
67 <AbsoluteFill
68 style={{
69 transform: `translateX(${videoX}%)`,
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line
1 import {
2 AbsoluteFill,
3 Easing,
4 + Sequence,
5 interpolate,
6 staticFile,
7 useCurrentFrame,
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Added a whoosh sound effect (https://remotion.media/whoosh.wav) at
volume 0.3, timed to play when the slide-in animation starts.
✻ Churned for 33s
❯ delay the sound effect by 1 second.
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
62
63 return (
64 <AbsoluteFill>
65 - <Sequence from={Math.floor(slideInStart)} layout="none">
65 + <Sequence from={Math.floor(slideInStart + 1 * fps)} layou
+t="none">
66 <Audio src="https://remotion.media/whoosh.wav" volume={
0.3} />
67 </Sequence>
68 <AbsoluteFill
⏺ Done. The whoosh now plays 1 second after the slide-in starts.
❯ make the overlay only take up 40% of the screen real estate not half.
⏺ Update(src/Scene2.tsx)
⎿  Added 2 lines, removed 2 lines
78 </AbsoluteFill>
79 <AbsoluteFill
80 style={{
81 - left: "50%",
82 - width: "50%",
81 + left: "60%",
82 + width: "40%",
83 transform: `translateX(${overlayX}%)`,
84 backgroundColor: "white",
85 }}
⏺ Also need to adjust the video shift — now it should shift by 20% (half of 40%)
instead of 25%:
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
52 slideOutStart,
53 slideOutStart + slideOutDuration,
54 ],
55 - [0, -25, -25, 0],
55 + [0, -20, -20, 0],
56 {
57 easing: Easing.inOut(Easing.quad),
58 extrapolateLeft: "clamp",
⏺ Done. Overlay now covers the right 40%, and the video shifts left by 20% to
keep the speaker centered.
❯ the transition looks better when the in transition is Easing.out and the out
transition is easing.in.
add them together.
make the overlayX and videoX interpolations less redundant by first making an
interpolate that animates from 0 to 1.
then videoX and overlayX interpolate again based on the normalized value
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene2.tsx)
⎿  Added 13 lines, removed 22 lines
25 const slideInStart = 0.5 * fps;
26 const slideOutStart = slideInStart + slideInDuration + holdDu
ration;
27
28 - // Overlay slides in from right: 100% -> 0% translateX
29 - const overlayX = interpolate(
28 + // Normalized progress: 0 -> 1 (in) then 1 -> 0 (out)
29 + const slideIn = interpolate(
30 frame,
31 - [
32 - slideInStart,
33 - slideInStart + slideInDuration,
34 - slideOutStart,
35 - slideOutStart + slideOutDuration,
36 - ],
37 - [100, 0, 0, 100],
31 + [slideInStart, slideInStart + slideInDuration],
32 + [0, 1],
33 {
39 - easing: Easing.inOut(Easing.quad),
34 + easing: Easing.out(Easing.quad),
35 extrapolateLeft: "clamp",
36 extrapolateRight: "clamp",
37 },
38 );
44 -
45 - // Video shifts left by 25% of width (half of the 50% overlay
-)
46 - // so the speaker stays centered in the left half
47 - const videoX = interpolate(
39 + const slideOut = interpolate(
40 frame,
49 - [
50 - slideInStart,
51 - slideInStart + slideInDuration,
52 - slideOutStart,
53 - slideOutStart + slideOutDuration,
54 - ],
55 - [0, -20, -20, 0],
41 + [slideOutStart, slideOutStart + slideOutDuration],
42 + [0, 1],
43 {
57 - easing: Easing.inOut(Easing.quad),
44 + easing: Easing.in(Easing.quad),
45 extrapolateLeft: "clamp",
46 extrapolateRight: "clamp",
47 },
48 );
49 + const progress = slideIn - slideOut;
50
51 + const overlayX = interpolate(progress, [0, 1], [100, 0]);
52 + const videoX = interpolate(progress, [0, 1], [0, -20]);
53 +
54 return (
55 <AbsoluteFill>
56 <Sequence from={Math.floor(slideInStart + 1 * fps)} layou
t="none">
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Now slideIn (0→1 with Easing.out) and slideOut (0→1 with Easing.in) are
combined as progress = slideIn - slideOut, and overlayX/videoX are simple
interpolations from that normalized value.
❯ update the timing skill to reflect these new learnings (composing
interpolates and Easing.in for out, Easing.out for in)
Read 1 file (ctrl+o to expand)
⏺ Update(.claude/skills/remotion-best-practices/rules/timing.md)
⎿  Added 31 lines
177 extrapolateRight: "clamp",
178 });
179 ```
180 +
181 +### Easing direction for enter/exit animations
182 +
183 +Use `Easing.out` for enter animations (starts fast, decelerate
+s into place) and `Easing.in` for exit animations (starts slow
+, accelerates away). This feels natural because elements arriv
+e with momentum and leave with gravity.
184 +
185 +## Composing interpolations
186 +
187 +When multiple properties share the same timing (e.g. a slide-i
+n panel and a video shift), avoid duplicating the full interpo
+lation for each property. Instead, create a single normalized
+progress value (0 to 1) and derive each property from it:
188 +
189 +```tsx
190 +const slideIn = interpolate(
191 + frame,
192 + [slideInStart, slideInStart + slideInDuration],
193 + [0, 1],
194 + { easing: Easing.out(Easing.quad), extrapolateLeft: "clamp",
+ extrapolateRight: "clamp" },
195 +);
196 +const slideOut = interpolate(
197 + frame,
198 + [slideOutStart, slideOutStart + slideOutDuration],
199 + [0, 1],
200 + { easing: Easing.in(Easing.quad), extrapolateLeft: "clamp",
+extrapolateRight: "clamp" },
201 +);
202 +const progress = slideIn - slideOut;
203 +
204 +// Derive multiple properties from the same progress
205 +const overlayX = interpolate(progress, [0, 1], [100, 0]);
206 +const videoX = interpolate(progress, [0, 1], [0, -20]);
207 +const opacity = interpolate(progress, [0, 1], [0, 1]);
208 +```
209 +
210 +This pattern works with both `interpolate` and `spring`. The k
+ey idea: separate **timing** (when and how fast) from **mappin
+g** (what values to animate between).
⏺ Done. Added two new sections to the timing skill:
- Easing direction for enter/exit — use Easing.out for in, Easing.in for out
- Composing interpolations — normalize to a single progress value, then derive
multiple properties from it
❯ make the in and out transition last 0.8 seconds each
⏺ Update(src/Scene2.tsx)
⎿  Added 2 lines, removed 2 lines
19 const trimBefore = Math.floor(silence.leadingEnd * fps);
20 const trimAfter = Math.ceil(silence.trailingStart * fps);
21
22 - const slideInDuration = 0.4 * fps;
22 + const slideInDuration = 0.8 * fps;
23 const holdDuration = 3.5 * fps;
24 - const slideOutDuration = 0.4 * fps;
24 + const slideOutDuration = 0.8 * fps;
25 const slideInStart = 0.5 * fps;
26 const slideOutStart = slideInStart + slideInDuration + holdDu
ration;
27
⏺ Done.
❯ cubic looks better than quad, make it the default in the skill
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
31 [slideInStart, slideInStart + slideInDuration],
32 [0, 1],
33 {
34 - easing: Easing.out(Easing.quad),
34 + easing: Easing.out(Easing.cubic),
35 extrapolateLeft: "clamp",
36 extrapolateRight: "clamp",
37 },
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
41 [slideOutStart, slideOutStart + slideOutDuration],
42 [0, 1],
43 {
44 - easing: Easing.in(Easing.quad),
44 + easing: Easing.in(Easing.cubic),
45 extrapolateLeft: "clamp",
46 extrapolateRight: "clamp",
47 },
⏺ Now update the timing skill to use cubic as the default:
⏺ Update(.claude/skills/remotion-best-practices/rules/timing.md)
⎿  Added 5 lines, removed 5 lines
138 import { interpolate, Easing } from "remotion";
139
140 const value1 = interpolate(frame, [0, 100], [0, 1], {
141 - easing: Easing.inOut(Easing.quad),
141 + easing: Easing.inOut(Easing.cubic),
142 extrapolateLeft: "clamp",
143 extrapolateRight: "clamp",
144 });
...
153
154 and curves (sorted from most linear to most curved):
155
156 -- `Easing.quad`
156 +- `Easing.cubic`
157 - `Easing.sin`
158 - `Easing.exp`
159 - `Easing.circle`
...
162
163 ```ts
164 const value1 = interpolate(frame, [0, 100], [0, 1], {
165 - easing: Easing.inOut(Easing.quad),
165 + easing: Easing.inOut(Easing.cubic),
166 extrapolateLeft: "clamp",
167 extrapolateRight: "clamp",
168 });
...
191 frame,
192 [slideInStart, slideInStart + slideInDuration],
193 [0, 1],
194 - { easing: Easing.out(Easing.quad), extrapolateLeft: "clamp",
- extrapolateRight: "clamp" },
194 + { easing: Easing.out(Easing.cubic), extrapolateLeft: "clamp"
+, extrapolateRight: "clamp" },
195 );
196 const slideOut = interpolate(
197 frame,
198 [slideOutStart, slideOutStart + slideOutDuration],
199 [0, 1],
200 - { easing: Easing.in(Easing.quad), extrapolateLeft: "clamp",
-extrapolateRight: "clamp" },
200 + { easing: Easing.in(Easing.cubic), extrapolateLeft: "clamp",
+ extrapolateRight: "clamp" },
201 );
202 const progress = slideIn - slideOut;
203
⏺ Wait — Easing.cubic doesn't exist in Remotion. The available curves are quad,
sin, exp, circle. Let me check what the correct name is.
Searched for 2 patterns, read 1 file (ctrl+o to expand)
⏺ Easing.cubic does exist. The skill's list of curves was just incomplete. Let
me fix the curve list in the skill:
⏺ Update(.claude/skills/remotion-best-practices/rules/timing.md)
⎿  Added 2 lines, removed 1 line
153
154 and curves (sorted from most linear to most curved):
155
156 -- `Easing.cubic`
156 +- `Easing.quad`
157 +- `Easing.cubic` (recommended default)
158 - `Easing.sin`
159 - `Easing.exp`
160 - `Easing.circle`
⏺ Done. Updated Scene2 to use Easing.cubic, and the timing skill now lists cubic
as the recommended default curve (with quad also listed).
✻ Sautéed for 35s
❯ instead of 0.8sec, 1.5sec
⏺ Update(src/Scene2.tsx)
⎿  Added 2 lines, removed 2 lines
19 const trimBefore = Math.floor(silence.leadingEnd * fps);
20 const trimAfter = Math.ceil(silence.trailingStart * fps);
21
22 - const slideInDuration = 0.8 * fps;
22 + const slideInDuration = 1.5 * fps;
23 const holdDuration = 3.5 * fps;
24 - const slideOutDuration = 0.8 * fps;
24 + const slideOutDuration = 1.5 * fps;
25 const slideInStart = 0.5 * fps;
26 const slideOutStart = slideInStart + slideInDuration + holdDu
ration;
27
⏺ Done.
❯ scene 2 is about light leaks.
make a new overlay that shows different light leaks in a 2x2 grid. vary seed
and colors. black background.
then, when we have the overlay, then show it in scene 2, from 8sec to 10 sec.
make the light leaks fast and swap them. fade in and out the overlay over
0.2sec.
Read 2 files (ctrl+o to expand)
⏺ Write(src/LightLeakGrid.tsx)
⎿  Wrote 21 lines to src/LightLeakGrid.tsx
1 import { AbsoluteFill } from "remotion";
2 import { LightLeak } from "@remotion/light-leaks";
3
4 export const LightLeakGrid: React.FC = () => {
5 return (
6 <AbsoluteFill style={{ backgroundColor: "black" }}>
7 <AbsoluteFill style={{ width: "50%", height: "50%", top: 0
, left: 0 }}>
8 <LightLeak seed={1} hueShift={0} />
9 </AbsoluteFill>
10 <AbsoluteFill style={{ width: "50%", height: "50%", top: 0
, left: "50%" }}>
… +11 lines (ctrl+o to expand)
⏺ Now add the light leak overlay to Scene2, from 8s to 10s with 0.2s fade
in/out:
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line
9 } from "remotion";
10 import { Audio, Video } from "@remotion/media";
11 import { SILENCES } from "./Composition";
12 +import { LightLeakGrid } from "./LightLeakGrid";
13
14 const FILE = "whats2.mov";
15
⏺ Update(src/Scene2.tsx)
⎿  Added 11 lines
52 const overlayX = interpolate(progress, [0, 1], [102, 0]);
53 const videoX = interpolate(progress, [0, 1], [0, -20]);
54
55 + // Light leak overlay: 8s to 10s with 0.2s fade
56 + const llStart = 8 * fps;
57 + const llEnd = 10 * fps;
58 + const llFade = 0.2 * fps;
59 + const llOpacity = interpolate(
60 + frame,
61 + [llStart, llStart + llFade, llEnd - llFade, llEnd],
62 + [0, 1, 1, 0],
63 + { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
64 + );
65 +
66 return (
67 <AbsoluteFill>
68 <AbsoluteFill
⏺ Update(src/Scene2.tsx)
⎿  Added 7 lines
84 backgroundColor: "white",
85 }}
86 />
87 + {llOpacity > 0 && (
88 + <Sequence from={Math.floor(llStart)} durationInFrames={
+Math.ceil(llEnd - llStart)} layout="none">
89 + <AbsoluteFill style={{ opacity: llOpacity }}>
90 + <LightLeakGrid />
91 + </AbsoluteFill>
92 + </Sequence>
93 + )}
94 </AbsoluteFill>
95 );
96 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  Error: Exit code 2
src/Scene2.tsx(10,10): error TS6133: 'Audio' is declared but its value is
never read.
Read 1 file (ctrl+o to expand)
⏺ Looks like the whoosh <Audio> was removed by the user's earlier edit. Let me
remove the unused import.
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
7 useCurrentFrame,
8 useVideoConfig,
9 } from "remotion";
10 -import { Audio, Video } from "@remotion/media";
10 +import { Video } from "@remotion/media";
11 import { SILENCES } from "./Composition";
12 import { LightLeakGrid } from "./LightLeakGrid";
13
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created LightLeakGrid.tsx with a 2x2 grid of light leaks (different
seeds: 1, 7, 13, 21 and hue shifts: 0, 200, 120, 300) on a black background.
It's shown in Scene2 from 8s to 10s, fading in and out over 0.2s each.
✻ Crunched for 1m 1s
❯ it should stay a bit longer, 8sec to 14sec. in each slot, show 3 variations
of the same color
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
54
55 // Light leak overlay: 8s to 10s with 0.2s fade
56 const llStart = 8 * fps;
57 - const llEnd = 10 * fps;
57 + const llEnd = 14 * fps;
58 const llFade = 0.2 * fps;
59 const llOpacity = interpolate(
60 frame,
⏺ Now update the grid to cycle through 3 variations per slot:
Read 1 file (ctrl+o to expand)
⏺ Write(src/LightLeakGrid.tsx)
⎿  Added 22 lines, removed 14 lines
1 -import { AbsoluteFill } from "remotion";
1 +import { AbsoluteFill, Series } from "remotion";
2 import { LightLeak } from "@remotion/light-leaks";
3
4 -export const LightLeakGrid: React.FC = () => {
4 +const SLOTS: { hueShift: number; seeds: [number, number, number
+]; style: React.CSSProperties }[] = [
5 + { hueShift: 0, seeds: [1, 3, 5], style: { width: "50%", heigh
+t: "50%", top: 0, left: 0 } },
6 + { hueShift: 200, seeds: [7, 9, 11], style: { width: "50%", he
+ight: "50%", top: 0, left: "50%" } },
7 + { hueShift: 120, seeds: [13, 15, 17], style: { width: "50%",
+height: "50%", top: "50%", left: 0 } },
8 + { hueShift: 300, seeds: [21, 23, 25], style: { width: "50%",
+height: "50%", top: "50%", left: "50%" } },
9 +];
10 +
11 +export const LightLeakGrid: React.FC<{ durationInFrames: number
+ }> = ({ durationInFrames }) => {
12 + const variationDuration = Math.ceil(durationInFrames / 3);
13 +
14 return (
15 <AbsoluteFill style={{ backgroundColor: "black" }}>
7 - <AbsoluteFill style={{ width: "50%", height: "50%", top:
-0, left: 0 }}>
8 - <LightLeak seed={1} hueShift={0} />
9 - </AbsoluteFill>
10 - <AbsoluteFill style={{ width: "50%", height: "50%", top:
-0, left: "50%" }}>
11 - <LightLeak seed={7} hueShift={200} />
12 - </AbsoluteFill>
13 - <AbsoluteFill style={{ width: "50%", height: "50%", top:
-"50%", left: 0 }}>
14 - <LightLeak seed={13} hueShift={120} />
15 - </AbsoluteFill>
16 - <AbsoluteFill style={{ width: "50%", height: "50%", top:
-"50%", left: "50%" }}>
17 - <LightLeak seed={21} hueShift={300} />
18 - </AbsoluteFill>
16 + {SLOTS.map((slot) => (
17 + <AbsoluteFill key={slot.hueShift} style={slot.style}>
18 + <Series>
19 + {slot.seeds.map((seed) => (
20 + <Series.Sequence key={seed} durationInFrames={var
+iationDuration}>
21 + <LightLeak seed={seed} hueShift={slot.hueShift}
+ />
22 + </Series.Sequence>
23 + ))}
24 + </Series>
25 + </AbsoluteFill>
26 + ))}
27 </AbsoluteFill>
28 );
29 };
⏺ Now pass the duration from Scene2:
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
87 {llOpacity > 0 && (
88 <Sequence from={Math.floor(llStart)} durationInFrames={
Math.ceil(llEnd - llStart)} layout="none">
89 <AbsoluteFill style={{ opacity: llOpacity }}>
90 - <LightLeakGrid />
90 + <LightLeakGrid durationInFrames={Math.ceil(llEnd -
+llStart)} />
91 </AbsoluteFill>
92 </Sequence>
93 )}
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. The light leak overlay now runs from 8s to 14s, and each slot in the 2x2
grid cycles through 3 seed variations of the same color (each lasting 2s).
✻ Churned for 35s
❯ between scene 1 and 2, add a light leak effect for 0.3sec and add a whoosh
sound effect
Read 2 files (ctrl+o to expand)
⏺ I need to switch from <Series> to <TransitionSeries> to support the overlay
between scenes 1 and 2. Let me install @remotion/transitions first.
⏺ Bash(npx remotion add @remotion/transitions 2>&1 | tail -5)
⎿  installed @remotion/transitions@4.0.437
3 packages installed [3.53s]
+ @remotion/transitions@4.0.437
⏺ Now rewrite Composition.tsx to use TransitionSeries with a light leak overlay
+ whoosh between scenes 1 and 2:
⏺ Write(src/Composition.tsx)
⎿  Added 47 lines, removed 21 lines
1 -import { AbsoluteFill, Series, staticFile, useVideoConfig } from
- "remotion";
2 -import { Video } from "@remotion/media";
1 +import { AbsoluteFill, Sequence, staticFile, useVideoConfig } fr
+om "remotion";
2 +import { Video, Audio } from "@remotion/media";
3 +import { TransitionSeries } from "@remotion/transitions";
4 +import { LightLeak } from "@remotion/light-leaks";
5 import { Scene2 } from "./Scene2";
6
7 export const VIDEO_FILES = [
...
35 "whats11.mov": { leadingEnd: 3.27, trailingStart: 28 },
36 };
37
38 +const getDuration = (file: string, fps: number) => {
39 + const silence = SILENCES[file];
40 + const trimBefore = Math.floor(silence.leadingEnd * fps);
41 + const trimAfter = Math.ceil(silence.trailingStart * fps);
42 + return { trimBefore, trimAfter, durationInFrames: trimAfter -
+ trimBefore };
43 +};
44 +
45 +const VideoScene: React.FC<{ file: string }> = ({ file }) => {
46 + const { fps } = useVideoConfig();
47 + const { trimBefore, trimAfter } = getDuration(file, fps);
48 + return (
49 + <Video
50 + src={staticFile(file)}
51 + trimBefore={trimBefore}
52 + trimAfter={trimAfter}
53 + />
54 + );
55 +};
56 +
57 export const MyComposition = () => {
58 const { fps } = useVideoConfig();
59 + const overlayDuration = Math.round(0.3 * fps);
60
61 return (
62 <AbsoluteFill style={{ backgroundColor: "black" }}>
41 - <Series>
42 - {VIDEO_FILES.map((file) => {
43 - const silence = SILENCES[file];
44 - const trimBefore = Math.floor(silence.leadingEnd * fp
-s);
45 - const trimAfter = Math.ceil(silence.trailingStart * f
-ps);
46 - const durationInFrames = trimAfter - trimBefore;
63 + <TransitionSeries>
64 + {VIDEO_FILES.map((file, index) => {
65 + const { durationInFrames } = getDuration(file, fps);
66 + const elements: React.ReactNode[] = [];
67
48 - return (
49 - <Series.Sequence key={file} durationInFrames={durat
-ionInFrames} premountFor={30}>
50 - {file === "whats2.mov" ? (
51 - <Scene2 />
52 - ) : (
53 - <Video
54 - src={staticFile(file)}
55 - trimBefore={trimBefore}
56 - trimAfter={trimAfter}
57 - />
58 - )}
59 - </Series.Sequence>
68 + elements.push(
69 + <TransitionSeries.Sequence key={file} durationInFra
+mes={durationInFrames} premountFor={30}>
70 + {file === "whats2.mov" ? <Scene2 /> : <VideoScene
+ file={file} />}
71 + </TransitionSeries.Sequence>,
72 );
73 +
74 + // Light leak overlay + whoosh between scene 1 and 2
75 + if (index === 0) {
76 + elements.push(
77 + <TransitionSeries.Overlay key="ll-1-2" durationIn
+Frames={overlayDuration}>
78 + <LightLeak seed={4} hueShift={30} />
79 + <Sequence from={0} layout="none">
80 + <Audio src="https://remotion.media/whoosh.wav
+" volume={0.3} />
81 + </Sequence>
82 + </TransitionSeries.Overlay>,
83 + );
84 + }
85 +
86 + return elements;
87 })}
62 - </Series>
88 + </TransitionSeries>
89 </AbsoluteFill>
90 );
91 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Between scenes 1 and 2 there's now a 0.3s <TransitionSeries.Overlay>
with a <LightLeak> effect and a whoosh sound at volume 0.3. The composition
uses <TransitionSeries> instead of <Series> to support the overlay.
✻ Worked for 42s
❯ actually I meant between scene 2 and 3. use seed=25, hueShift=173 and
opacity=0.5
⏺ Update(src/Composition.tsx)
⎿  Added 6 lines, removed 4 lines
71 </TransitionSeries.Sequence>,
72 );
73
74 - // Light leak overlay + whoosh between scene 1 and 2
75 - if (index === 0) {
74 + // Light leak overlay + whoosh between scene 2 and 3
75 + if (index === 1) {
76 elements.push(
77 - <TransitionSeries.Overlay key="ll-1-2" durationIn
-Frames={overlayDuration}>
78 - <LightLeak seed={4} hueShift={30} />
77 + <TransitionSeries.Overlay key="ll-2-3" durationIn
+Frames={overlayDuration}>
78 + <AbsoluteFill style={{ opacity: 0.5 }}>
79 + <LightLeak seed={25} hueShift={173} />
80 + </AbsoluteFill>
81 <Sequence from={0} layout="none">
82 <Audio src="https://remotion.media/whoosh.wav
" volume={0.3} />
83 </Sequence>
⏺ Done. Moved to between scenes 2 and 3, with seed=25, hueShift=173, and
opacity=0.5.
❯ make it go for 0.5sec instead. also change the trim so there is a bit more
space between the scenes
Read 1 file (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
56
57 export const MyComposition = () => {
58 const { fps } = useVideoConfig();
59 - const overlayDuration = Math.round(0.3 * fps);
59 + const overlayDuration = Math.round(0.5 * fps);
60
61 return (
62 <AbsoluteFill style={{ backgroundColor: "black" }}>
⏺ Now trim scenes 2 and 3 a bit tighter so there's more breathing room at the
cut:
⏺ Update(src/Composition.tsx)
⎿  Added 2 lines, removed 2 lines
23 export const SILENCES: Record<string, { leadingEnd: number; tra
ilingStart: number }> =
24 {
25 "whats1.mov": { leadingEnd: 0, trailingStart: 4.67 },
26 - "whats2.mov": { leadingEnd: 6.37, trailingStart: 31.13 },
27 - "whats3.mov": { leadingEnd: 2.89, trailingStart: 43.81 },
26 + "whats2.mov": { leadingEnd: 6.37, trailingStart: 30.5 },
27 + "whats3.mov": { leadingEnd: 3.5, trailingStart: 43.81 },
28 "whats4.mov": { leadingEnd: 2.24, trailingStart: 38.77 },
29 "whats5.mov": { leadingEnd: 3.04, trailingStart: 25.31 },
30 "whats6.mov": { leadingEnd: 2.32, trailingStart: 31.64 },
⏺ Done. Overlay is now 0.5s, and scenes 2 and 3 are trimmed a bit tighter (scene
2 ends at 30.5s instead of 31.13s, scene 3 starts at 3.5s instead of 2.89s)
to add more breathing room around the transition.
❯ the opposite, it should be loosed not tighter
⏺ Update(src/Composition.tsx)
⎿  Added 2 lines, removed 2 lines
23 export const SILENCES: Record<string, { leadingEnd: number; tra
ilingStart: number }> =
24 {
25 "whats1.mov": { leadingEnd: 0, trailingStart: 4.67 },
26 - "whats2.mov": { leadingEnd: 6.37, trailingStart: 30.5 },
27 - "whats3.mov": { leadingEnd: 3.5, trailingStart: 43.81 },
26 + "whats2.mov": { leadingEnd: 6.37, trailingStart: 31.8 },
27 + "whats3.mov": { leadingEnd: 2.3, trailingStart: 43.81 },
28 "whats4.mov": { leadingEnd: 2.24, trailingStart: 38.77 },
29 "whats5.mov": { leadingEnd: 3.04, trailingStart: 25.31 },
30 "whats6.mov": { leadingEnd: 2.32, trailingStart: 31.64 },
⏺ Done. Loosened the trims — scene 2 now ends later (31.8s) and scene 3 starts
earlier (2.3s), giving more space around the transition.
❯ componentize the overlay from scene2 where it slides in from the right, so we
can also use it in other places.
it should accept some children so we can render content
Read 1 file (ctrl+o to expand)
⏺ Write(src/SlideInOverlay.tsx)
⎿  Wrote 117 lines to src/SlideInOverlay.tsx
1 import {
2 AbsoluteFill,
3 Easing,
4 interpolate,
5 useCurrentFrame,
6 useVideoConfig,
7 } from "remotion";
8
9 type SlideInOverlayProps = {
10 children: React.ReactNode;
… +107 lines (ctrl+o to expand)
⏺ Actually, a hook is cleaner than a component here since the consumer needs
access to videoX for the background. But having both a dead component and a
hook is messy. Let me redo this properly as just a component that wraps both
the background and overlay content.
⏺ Write(src/SlideInOverlay.tsx)
⎿  Added 26 lines, removed 52 lines
7 } from "remotion";
8
9 type SlideInOverlayProps = {
10 + /** The main background content (e.g. a video) */
11 + background: React.ReactNode;
12 + /** Content rendered inside the sliding panel */
13 children: React.ReactNode;
14 /** When the slide-in starts, in seconds */
15 startAt: number;
13 - /** Duration of the slide-in animation, in seconds */
16 + /** Duration of the slide-in animation, in seconds. Default:
+1.5 */
17 slideInDuration?: number;
15 - /** Duration the overlay stays fully visible, in seconds */
18 + /** Duration the overlay stays fully visible, in seconds. Def
+ault: 3.5 */
19 holdDuration?: number;
17 - /** Duration of the slide-out animation, in seconds */
20 + /** Duration of the slide-out animation, in seconds. Default:
+ 1.5 */
21 slideOutDuration?: number;
19 - /** Width of the overlay as a percentage of the composition *
-/
22 + /** Width of the overlay as a percentage of the composition.
+Default: 40 */
23 widthPercent?: number;
21 - /** How much the background content shifts left as a percenta
-ge */
24 + /** How much the background shifts left as a percentage. Defa
+ult: 20 */
25 backgroundShift?: number;
23 - /** Background color of the overlay panel */
26 + /** Background color of the overlay panel. Default: "white" *
+/
27 backgroundColor?: string;
28 };
29
30 export const SlideInOverlay: React.FC<SlideInOverlayProps> = ({
31 + background,
32 children,
33 startAt,
34 slideInDuration = 1.5,
...
71 const overlayX = interpolate(progress, [0, 1], [102, 0]);
72 const videoX = interpolate(progress, [0, 1], [0, -background
Shift]);
73
70 - return { progress, overlayX, videoX, widthPercent, backgroun
-dColor };
71 -};
72 -
73 -export const useSlideInOverlay = ({
74 - startAt,
75 - slideInDuration = 1.5,
76 - holdDuration = 3.5,
77 - slideOutDuration = 1.5,
78 - widthPercent = 40,
79 - backgroundShift = 20,
80 -}: Omit<SlideInOverlayProps, "children" | "backgroundColor">)
-=> {
81 - const frame = useCurrentFrame();
82 - const { fps } = useVideoConfig();
83 -
84 - const inStart = startAt * fps;
85 - const inDuration = slideInDuration * fps;
86 - const outStart = inStart + inDuration + holdDuration * fps;
87 - const outDuration = slideOutDuration * fps;
88 -
89 - const slideIn = interpolate(
90 - frame,
91 - [inStart, inStart + inDuration],
92 - [0, 1],
93 - {
94 - easing: Easing.out(Easing.cubic),
95 - extrapolateLeft: "clamp",
96 - extrapolateRight: "clamp",
97 - },
74 + return (
75 + <AbsoluteFill>
76 + <AbsoluteFill style={{ transform: `translateX(${videoX}%
+)` }}>
77 + {background}
78 + </AbsoluteFill>
79 + <AbsoluteFill
80 + style={{
81 + left: `${100 - widthPercent}%`,
82 + width: `${widthPercent}%`,
83 + transform: `translateX(${overlayX}%)`,
84 + backgroundColor,
85 + }}
86 + >
87 + {children}
88 + </AbsoluteFill>
89 + </AbsoluteFill>
90 );
99 - const slideOut = interpolate(
100 - frame,
101 - [outStart, outStart + outDuration],
102 - [0, 1],
103 - {
104 - easing: Easing.in(Easing.cubic),
105 - extrapolateLeft: "clamp",
106 - extrapolateRight: "clamp",
107 - },
108 - );
109 - const progress = slideIn - slideOut;
110 -
111 - return {
112 - progress,
113 - overlayX: interpolate(progress, [0, 1], [102, 0]),
114 - videoX: interpolate(progress, [0, 1], [0, -backgroundShift
-]),
115 - widthPercent,
116 - };
91 };
⏺ Now update Scene2 to use it:
⏺ Write(src/Scene2.tsx)
⎿  Added 13 lines, removed 52 lines
1 import {
2 AbsoluteFill,
3 - Easing,
3 Sequence,
4 interpolate,
5 staticFile,
...
9 import { Video } from "@remotion/media";
10 import { SILENCES } from "./Composition";
11 import { LightLeakGrid } from "./LightLeakGrid";
12 +import { SlideInOverlay } from "./SlideInOverlay";
13
14 const FILE = "whats2.mov";
15
...
20 const trimBefore = Math.floor(silence.leadingEnd * fps);
21 const trimAfter = Math.ceil(silence.trailingStart * fps);
22
23 - const slideInDuration = 1.5 * fps;
24 - const holdDuration = 3.5 * fps;
25 - const slideOutDuration = 1.5 * fps;
26 - const slideInStart = 0.5 * fps;
27 - const slideOutStart = slideInStart + slideInDuration + holdDu
-ration;
28 -
29 - // Normalized progress: 0 -> 1 (in) then 1 -> 0 (out)
30 - const slideIn = interpolate(
31 - frame,
32 - [slideInStart, slideInStart + slideInDuration],
33 - [0, 1],
34 - {
35 - easing: Easing.out(Easing.cubic),
36 - extrapolateLeft: "clamp",
37 - extrapolateRight: "clamp",
38 - },
39 - );
40 - const slideOut = interpolate(
41 - frame,
42 - [slideOutStart, slideOutStart + slideOutDuration],
43 - [0, 1],
44 - {
45 - easing: Easing.in(Easing.cubic),
46 - extrapolateLeft: "clamp",
47 - extrapolateRight: "clamp",
48 - },
49 - );
50 - const progress = slideIn - slideOut;
51 -
52 - const overlayX = interpolate(progress, [0, 1], [102, 0]);
53 - const videoX = interpolate(progress, [0, 1], [0, -20]);
54 -
55 - // Light leak overlay: 8s to 10s with 0.2s fade
23 + // Light leak overlay: 8s to 14s with 0.2s fade
24 const llStart = 8 * fps;
25 const llEnd = 14 * fps;
26 const llFade = 0.2 * fps;
...
33
34 return (
35 <AbsoluteFill>
68 - <AbsoluteFill
69 - style={{
70 - transform: `translateX(${videoX}%)`,
71 - }}
36 + <SlideInOverlay
37 + startAt={0.5}
38 + background={
39 + <Video
40 + src={staticFile(FILE)}
41 + trimBefore={trimBefore}
42 + trimAfter={trimAfter}
43 + />
44 + }
45 >
73 - <Video
74 - src={staticFile(FILE)}
75 - trimBefore={trimBefore}
76 - trimAfter={trimAfter}
77 - />
78 - </AbsoluteFill>
79 - <AbsoluteFill
80 - style={{
81 - left: "60%",
82 - width: "40%",
83 - transform: `translateX(${overlayX}%)`,
84 - backgroundColor: "white",
85 - }}
86 - />
46 + {null}
47 + </SlideInOverlay>
48 {llOpacity > 0 && (
49 <Sequence from={Math.floor(llStart)} durationInFrames={
Math.ceil(llEnd - llStart)} layout="none">
50 <AbsoluteFill style={{ opacity: llOpacity }}>
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created SlideInOverlay component that accepts:
- background — the main content (e.g. video) that shifts left
- children — content rendered inside the sliding panel
- Configurable props: startAt, slideInDuration, holdDuration,
slideOutDuration, widthPercent, backgroundShift, backgroundColor
Scene2 now uses it, and the component is reusable for other scenes.
✻ Brewed for 56s
❯ then, in scene 2, import the numbered chapter component from here:
/Users/jonathanburger/remotion2/packages/brand/src/video-elements/numbered-chap
ter/index.tsx
then render it in scene 2 with "1. Light Leaks"
Read 1 file (ctrl+o to expand)
⏺ It imports from ../../colors and ../../load-font. Let me check those.
Read 2 files (ctrl+o to expand)
⏺ It uses a custom "GT Planar" font and a "Variable" font, plus a chime.mp3
sound. I'll adapt the component to be self-contained in this project —
inlining the color, using a simpler font loading approach, and copying the
required assets.
Read 1 file (ctrl+o to expand)
⏺ Bash(cp /Users/jonathanburger/remotion2/packages/brand/public/variable.woff2
/Users/jonathanburger/remotion2/packages/brand/public/chime.mp3
/Users/jonathanburger/wh…)
⎿  Done
⏺ Write(src/NumberedChapter.tsx)
⎿  Wrote 102 lines to src/NumberedChapter.tsx
1 import {
2 AbsoluteFill,
3 Audio,
4 continueRender,
5 delayRender,
6 spring,
7 staticFile,
8 useCurrentFrame,
9 useVideoConfig,
10 } from "remotion";
… +92 lines (ctrl+o to expand)
⏺ Now render it in Scene2's slide-in overlay, and apply the user's follow-up
requests (bigger text, smaller number/shape, chime volume 0.1):
⏺ Update(src/NumberedChapter.tsx)
⎿  Added 1 line, removed 1 line
56
57 return (
58 <AbsoluteFill>
59 - <Audio src={staticFile("chime.mp3")} />
59 + <Audio src={staticFile("chime.mp3")} volume={0.1} />
60 <AbsoluteFill
61 style={{
62 backgroundColor: "white",
⏺ Now wire it into Scene2:
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line
10 import { SILENCES } from "./Composition";
11 import { LightLeakGrid } from "./LightLeakGrid";
12 import { SlideInOverlay } from "./SlideInOverlay";
13 +import { NumberedChapter } from "./NumberedChapter";
14
15 const FILE = "whats2.mov";
16
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
44 />
45 }
46 >
47 - {null}
47 + <NumberedChapter chapterNumber={1} chapterTitle="Light
+Leaks" />
48 </SlideInOverlay>
49 {llOpacity > 0 && (
50 <Sequence from={Math.floor(llStart)} durationInFrames={
Math.ceil(llEnd - llStart)} layout="none">
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created NumberedChapter.tsx adapted from the brand package with:
- Smaller number circle (120px instead of 200px, font 50 instead of 80)
- Bigger title text (fontSize 56 instead of 40)
- Chime volume at 0.1
It's rendered inside Scene2's SlideInOverlay as <NumberedChapter
chapterNumber={1} chapterTitle="Light Leaks" />.
✻ Cooked for 1m 3s
❯ the text is now a bit too big. make it bolder.
make the animated delayed by 1sec
⏺ Update(src/NumberedChapter.tsx)
⎿  Added 2 lines, removed 1 line
90 alignItems: "center",
91 fontFamily: "Variable",
92 fontWeight: 700,
93 - fontSize: 56,
93 + fontSize: 46,
94 + fontWeight: 900,
95 translate: `0 ${-jump2 * 100 + 150}px`,
96 opacity: jump2,
97 }}
Read 1 file (ctrl+o to expand)
⏺ Duplicate fontWeight. Let me fix that:
⏺ Update(src/NumberedChapter.tsx)
⎿  Added 1 line, removed 2 lines
89 justifyContent: "center",
90 alignItems: "center",
91 fontFamily: "Variable",
92 - fontWeight: 700,
93 - fontSize: 46,
92 fontWeight: 900,
93 + fontSize: 46,
94 translate: `0 ${-jump2 * 100 + 150}px`,
95 opacity: jump2,
96 }}
⏺ Now delay the animation by 1 second:
⏺ Update(src/NumberedChapter.tsx)
⎿  Added 4 lines, removed 2 lines
40 const { fps } = useVideoConfig();
41 const frame = useCurrentFrame();
42
43 + const delay = 1 * fps;
44 +
45 const jump1 = spring({
46 fps,
45 - frame,
47 + frame: frame - delay,
48 config: { damping: 200 },
49 durationInFrames: 10,
50 });
51
52 const jump2 = spring({
53 fps,
52 - frame: frame - 7,
54 + frame: frame - delay - 7,
55 config: { damping: 200 },
56 durationInFrames: 10,
57 });
⏺ Done. Text is now 46px at fontWeight 900, and the animation is delayed by 1
second.
❯ in scene2, from frame 540, show another overlay with a white background.
import the following '/Users/jonathanburger/Desktop/Screen Recording 2026-03-19
at 11.13.19.mov' video and play it for 3 seconds.
make it centered on the white background and match the height of the container.
⏺ Bash(cp "/Users/jonathanburger/Desktop/Screen Recording 2026-03-19 at
11.13.19.mov" /Users/jonathanburger/whats-new/public/screen-recording.mov)
⎿  Done
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene2.tsx)
⎿  Added 18 lines
46 >
47 <NumberedChapter chapterNumber={1} chapterTitle="Light
Leaks" />
48 </SlideInOverlay>
49 + <Sequence from={540} durationInFrames={Math.round(3 * fps
+)} layout="none">
50 + <AbsoluteFill
51 + style={{
52 + backgroundColor: "white",
53 + justifyContent: "center",
54 + alignItems: "center",
55 + }}
56 + >
57 + <Video
58 + src={staticFile("screen-recording.mov")}
59 + muted
60 + style={{
61 + height: "100%",
62 + objectFit: "contain",
63 + }}
64 + />
65 + </AbsoluteFill>
66 + </Sequence>
67 {llOpacity > 0 && (
68 <Sequence from={Math.floor(llStart)} durationInFrames={
Math.ceil(llEnd - llStart)} layout="none">
69 <AbsoluteFill style={{ opacity: llOpacity }}>
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. From frame 540, a white background overlay appears for 3 seconds with
the screen recording centered and matching the container height.
❯ import the following brand element into this project:
/Users/jonathanburger/remotion2/packages/brand/src/video-elements/Prompt.tsx
Read 3 files (ctrl+o to expand)
⏺ Write(src/messages.ts)
⎿  Wrote 58 lines to src/messages.ts
1 export const MESSAGES = [
2 "Accomplishing",
3 "Actioning",
4 "Actualizing",
5 "Baking",
6 "Brewing",
7 "Calculating",
8 "Cerebrating",
9 "Churning",
10 "Clauding",
… +48 lines (ctrl+o to expand)
⏺ Write(src/Thinking.tsx)
⎿  Wrote 49 lines to src/Thinking.tsx
1 import { useCurrentFrame, useVideoConfig } from "remotion";
2 import { MESSAGES } from "./messages";
3
4 const SPINNER_CHARS = ["·", "✻", "✽", "✶", "✳", "✢"];
5 const BASE_COLOR = "#D47556";
6 const HIGHLIGHT_COLOR = "#E08468";
7
8 export type ThinkingProps = {
9 index: number;
10 };
… +39 lines (ctrl+o to expand)
⏺ Write(src/Prompt.tsx)
⎿  Wrote 137 lines to src/Prompt.tsx
1 import {
2 AbsoluteFill,
3 Easing,
4 interpolate,
5 spring,
6 useCurrentFrame,
7 useVideoConfig,
8 } from "remotion";
9 import { Thinking } from "./Thinking";
… +127 lines (ctrl+o to expand)
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Imported all three files adapted from the brand package:
- src/Prompt.tsx — typing animation with cursor, enter spring, and thinking
indicator
- src/Thinking.tsx — animated spinner with cycling highlight
- src/messages.ts — list of thinking messages
All dependencies are resolved locally (no zod schema needed, removed loadFont
dependency). Ready to use as <Prompt prompt="..." thinkingIndex={0} />.
✻ Brewed for 56s
❯ the screen-recording.mov overlay in scene2.
add a slight ken burns effect, keep the transform origin the top center.
make the overlay fade in and out for 0.2sec
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene2.tsx)
⎿  Added 37 lines, removed 17 lines
46 >
47 <NumberedChapter chapterNumber={1} chapterTitle="Light
Leaks" />
48 </SlideInOverlay>
49 - <Sequence from={540} durationInFrames={Math.round(3 * fps
-)} premountFor={30}>
50 - <AbsoluteFill
51 - style={{
52 - backgroundColor: "white",
53 - justifyContent: "center",
54 - alignItems: "center",
55 - }}
56 - >
57 - <Video
58 - src={staticFile("screen-recording.mov")}
59 - muted
60 - style={{
61 - height: "100%",
62 - objectFit: "contain",
63 - }}
64 - />
65 - </AbsoluteFill>
49 + <Sequence from={540} durationInFrames={Math.round(3 * fps
+)} premountFor={30} layout="none">
50 + {(() => {
51 + const srDuration = Math.round(3 * fps);
52 + const srFade = 0.2 * fps;
53 + const localFrame = frame - 540;
54 + const srOpacity = interpolate(
55 + localFrame,
56 + [0, srFade, srDuration - srFade, srDuration],
57 + [0, 1, 1, 0],
58 + { extrapolateLeft: "clamp", extrapolateRight: "clam
+p" },
59 + );
60 + const srScale = interpolate(localFrame, [0, srDuratio
+n], [1, 1.05], {
61 + extrapolateLeft: "clamp",
62 + extrapolateRight: "clamp",
63 + });
64 + return (
65 + <AbsoluteFill
66 + style={{
67 + backgroundColor: "white",
68 + justifyContent: "center",
69 + alignItems: "center",
70 + opacity: srOpacity,
71 + }}
72 + >
73 + <Video
74 + src={staticFile("screen-recording.mov")}
75 + muted
76 + style={{
77 + height: "100%",
78 + objectFit: "contain",
79 + transformOrigin: "top center",
80 + transform: `scale(${srScale})`,
81 + }}
82 + />
83 + </AbsoluteFill>
84 + );
85 + })()}
86 </Sequence>
87 {llOpacity > 0 && (
88 <Sequence from={Math.floor(llStart)} durationInFrames={
Math.ceil(llEnd - llStart)} layout="none">
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  Error: Exit code 2
src/Scene2.tsx(49,67): error TS2322: Type '{ children: Element; from:
number; durationInFrames: number; premountFor: number; layout: "none"; }'
is not assignable to type 'IntrinsicAttributes & (SequenceProps &
RefAttributes<HTMLDivElement>)'.
Property 'premountFor' does not exist on type 'IntrinsicAttributes & {
readonly durationInFrames?: number | undefined; } & { readonly children:
ReactNode; readonly width?: number | undefined; ... 10 more ...; readonly
_remotionInternalIsPostmounting?: boolean | undefined; } & { ...; } &
RefAttributes<...>'.
⏺ Can't combine premountFor with layout="none". Let me fix that:
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
46 >
47 <NumberedChapter chapterNumber={1} chapterTitle="Light
Leaks" />
48 </SlideInOverlay>
49 - <Sequence from={540} durationInFrames={Math.round(3 * fps
-)} premountFor={30} layout="none">
49 + <Sequence from={540} durationInFrames={Math.round(3 * fps
+)} layout="none">
50 {(() => {
51 const srDuration = Math.round(3 * fps);
52 const srFade = 0.2 * fps;
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. The screen recording overlay now:
- Fades in and out over 0.2s
- Has a subtle Ken Burns zoom from 1.0 to 1.05 over 3s, with transformOrigin:
"top center"
✻ Crunched for 36s
❯ then, at frame 670 in the scene, add a <Prompt> overlay that prompts "Add a
Light Leak transition between scenes"
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line
11 import { LightLeakGrid } from "./LightLeakGrid";
12 import { SlideInOverlay } from "./SlideInOverlay";
13 import { NumberedChapter } from "./NumberedChapter";
14 +import { Prompt } from "./Prompt";
15
16 const FILE = "whats2.mov";
17
⏺ Update(src/Scene2.tsx)
⎿  Added 3 lines
85 );
86 })()}
87 </Sequence>
88 + <Sequence from={670} layout="none">
89 + <Prompt prompt="Add a Light Leak transition between sce
+nes" thinkingIndex={5} />
90 + </Sequence>
91 {llOpacity > 0 && (
92 <Sequence from={Math.floor(llStart)} durationInFrames={
Math.ceil(llEnd - llStart)} layout="none">
93 <AbsoluteFill style={{ opacity: llOpacity }}>
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Added <Prompt> at frame 670 with thinkingIndex={5} and the text "Add a
Light Leak transition between scenes".
❯ show this for 3.5 sec, then 0.2sec fadeout
⏺ Update(src/Scene2.tsx)
⎿  Added 17 lines, removed 2 lines
85 );
86 })()}
87 </Sequence>
88 - <Sequence from={670} layout="none">
89 - <Prompt prompt="Add a Light Leak transition between sc
-enes" thinkingIndex={5} />
88 + <Sequence from={670} durationInFrames={Math.round(3.7 *
+fps)} layout="none">
89 + {(() => {
90 + const promptDuration = Math.round(3.7 * fps);
91 + const fadeOut = 0.2 * fps;
92 + const localFrame = frame - 670;
93 + const promptOpacity = interpolate(
94 + localFrame,
95 + [promptDuration - fadeOut, promptDuration],
96 + [1, 0],
97 + { extrapolateLeft: "clamp", extrapolateRight: "cla
+mp" },
98 + );
99 + return (
100 + <AbsoluteFill style={{ opacity: promptOpacity }}>
101 + <Prompt prompt="Add a Light Leak transition betw
+een scenes" thinkingIndex={5} />
102 + </AbsoluteFill>
103 + );
104 + })()}
105 </Sequence>
106 {llOpacity > 0 && (
107 <Sequence from={Math.floor(llStart)} durationInFrames=
{Math.ceil(llEnd - llStart)} layout="none">
⏺ Done. Shows for 3.5s of content + 0.2s fade out (3.7s total), then disappears.
❯ make the prompt overlay show up 0.5sec earlier
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
85 );
86 })()}
87 </Sequence>
88 - <Sequence from={670} durationInFrames={Math.round(3.7 * f
-ps)} layout="none">
88 + <Sequence from={655} durationInFrames={Math.round(3.7 * f
+ps)} layout="none">
89 {(() => {
90 const promptDuration = Math.round(3.7 * fps);
91 const fadeOut = 0.2 * fps;
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
89 {(() => {
90 const promptDuration = Math.round(3.7 * fps);
91 const fadeOut = 0.2 * fps;
92 - const localFrame = frame - 670;
92 + const localFrame = frame - 655;
93 const promptOpacity = interpolate(
94 localFrame,
95 [promptDuration - fadeOut, promptDuration],
⏺ Done. Prompt now starts at frame 655 (0.5s earlier).
❯ import the following sfx '/Users/jonathanburger/Downloads/ES_Thin, Handling,
Soft - Epidemic Sound - 1907-4195.wav'
and put it in the prompt component
⏺ Bash(cp "/Users/jonathanburger/Downloads/ES_Thin, Handling, Soft - Epidemic
Sound - 1907-4195.wav"
/Users/jonathanburger/whats-new/public/prompt-sfx.wav)
⎿  Done
Read 1 file (ctrl+o to expand)
⏺ Update(src/Prompt.tsx)
⎿  Added 2 lines
3 Easing,
4 interpolate,
5 spring,
6 + staticFile,
7 useCurrentFrame,
8 useVideoConfig,
9 } from "remotion";
10 +import { Audio } from "@remotion/media";
11 import { Thinking } from "./Thinking";
12
13 const TYPING_DURATION_SECONDS = 2;
Read 1 file (ctrl+o to expand)
⏺ Update(src/Prompt.tsx)
⎿  Added 1 line
100 paddingBottom: 80,
101 }}
102 >
103 + <Audio src={staticFile("prompt-sfx.wav")} volume={0.3} /
+>
104 <div
105 style={{
106 backgroundColor: "#292C34",
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Copied the SFX as public/prompt-sfx.wav and added it to the Prompt
component at volume 0.3.
❯ in scene3, use the same numbered chapter overlay, but write "2. Sound
Effects"
Read 1 file (ctrl+o to expand)
⏺ I need to create a Scene3 component. Let me first check the SlideInOverlay
props being used in Scene2 for reference.
⏺ Write(src/Scene3.tsx)
⎿  Wrote 31 lines to src/Scene3.tsx
1 import { AbsoluteFill, staticFile, useVideoConfig } from "remoti
on";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay } from "./SlideInOverlay";
5 import { NumberedChapter } from "./NumberedChapter";
6
7 const FILE = "whats3.mov";
8
9 export const Scene3: React.FC = () => {
10 const { fps } = useVideoConfig();
… +21 lines (ctrl+o to expand)
Read 1 file (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 1 line
3 import { TransitionSeries } from "@remotion/transitions";
4 import { LightLeak } from "@remotion/light-leaks";
5 import { Scene2 } from "./Scene2";
6 +import { Scene3 } from "./Scene3";
7
8 export const VIDEO_FILES = [
9 "whats1.mov",
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
68
69 elements.push(
70 <TransitionSeries.Sequence key={file} durationInFra
mes={durationInFrames} premountFor={30}>
71 - {file === "whats2.mov" ? <Scene2 /> : <VideoScene
- file={file} />}
71 + {file === "whats2.mov" ? <Scene2 /> : file === "w
+hats3.mov" ? <Scene3 /> : <VideoScene file={file} />}
72 </TransitionSeries.Sequence>,
73 );
74
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created Scene3.tsx with the same SlideInOverlay pattern, rendering
<NumberedChapter chapterNumber={2} chapterTitle="Sound Effects" />, and wired
it into the composition for whats3.mov.
✻ Cogitated for 36s
❯ the NumberedChapter number should have the ss03 font feature setting
Read 1 file (ctrl+o to expand)
⏺ Update(src/NumberedChapter.tsx)
⎿  Added 1 line
84 fontWeight: 700,
85 borderRadius: "50%",
86 fontFamily: "Variable",
87 + fontFeatureSettings: "'ss03' 1",
88 scale: String(jump1),
89 translate: `0 ${-jump2 * 50}px`,
90 }}
⏺ Done.
❯ import the following image and make it an overlay starting from frame 440 in
scene 3.
make it a white background similar to the overlay in scene 2, but this time,
zoom in a bit and animate from top to bottom.
you can use https://www.remotion.dev/docs/get-image-dimensions
⎿  [Image #1]
⏺ Bash(cp "/var/folders/x7/t81fj1590_q76dxgzwm5pjhc0000gn/T/TemporaryItems/NSIRD
_screencaptureui_QGhI7e/Screenshot 2026-03-19 at 11.24.46.png"
/Users/jonathanburger/wh…)
⎿  Done
Read 2 files (ctrl+o to expand)
⏺ Now I need to know the image dimensions to calculate the pan animation
properly.
⏺ Bash(sips -g pixelWidth -g pixelHeight
/Users/jonathanburger/whats-new/public/sfx-screenshot.png)
⎿  /Users/jonathanburger/whats-new/public/sfx-screenshot.png
pixelWidth: 1064
pixelHeight: 1148
⏺ Image is 1064x1148 (taller than wide). The composition is 1920x1080. I'll zoom
in and pan from top to bottom.
⏺ Write(src/Scene3.tsx)
⎿  Added 60 lines, removed 1 line
1 -import { AbsoluteFill, staticFile, useVideoConfig } from "remot
-ion";
1 +import {
2 + AbsoluteFill,
3 + Img,
4 + Sequence,
5 + interpolate,
6 + staticFile,
7 + useCurrentFrame,
8 + useVideoConfig,
9 +} from "remotion";
10 import { Video } from "@remotion/media";
11 import { SILENCES } from "./Composition";
12 import { SlideInOverlay } from "./SlideInOverlay";
...
14
15 const FILE = "whats3.mov";
16
17 +// sfx-screenshot.png is 1064x1148
18 +const IMG_WIDTH = 1064;
19 +const IMG_HEIGHT = 1148;
20 +
21 export const Scene3: React.FC = () => {
22 + const frame = useCurrentFrame();
23 const { fps } = useVideoConfig();
24 const silence = SILENCES[FILE];
25 const trimBefore = Math.floor(silence.leadingEnd * fps);
26 const trimAfter = Math.ceil(silence.trailingStart * fps);
27
28 + // Screenshot overlay starting at frame 440
29 + const ssStart = 440;
30 + const ssDuration = Math.round(4 * fps);
31 + const ssFade = 0.2 * fps;
32 + const localFrame = frame - ssStart;
33 +
34 + const ssOpacity = interpolate(
35 + localFrame,
36 + [0, ssFade, ssDuration - ssFade, ssDuration],
37 + [0, 1, 1, 0],
38 + { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
39 + );
40 +
41 + // Zoom in slightly (1.15x) and pan from top to bottom
42 + const ssScale = 1.15;
43 + // At scale 1.15, the image is bigger than the container.
44 + // We pan the image vertically from showing the top to showin
+g the bottom.
45 + // The visible height at this scale = containerHeight / scale
46 + // The overflow = imgDisplayHeight - visibleHeight
47 + const ssTranslateY = interpolate(
48 + localFrame,
49 + [0, ssDuration],
50 + [0, -15],
51 + { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
52 + );
53 +
54 return (
55 <AbsoluteFill>
56 <SlideInOverlay
...
65 >
66 <NumberedChapter chapterNumber={2} chapterTitle="Sound
Effects" />
67 </SlideInOverlay>
68 + <Sequence from={ssStart} durationInFrames={ssDuration} la
+yout="none">
69 + <AbsoluteFill
70 + style={{
71 + backgroundColor: "white",
72 + justifyContent: "center",
73 + alignItems: "center",
74 + opacity: ssOpacity,
75 + }}
76 + >
77 + <Img
78 + src={staticFile("sfx-screenshot.png")}
79 + style={{
80 + height: "100%",
81 + objectFit: "contain",
82 + transformOrigin: "top center",
83 + transform: `scale(${ssScale}) translateY(${ssTran
+slateY}%)`,
84 + }}
85 + />
86 + </AbsoluteFill>
87 + </Sequence>
88 </AbsoluteFill>
89 );
90 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  Error: Exit code 2
src/Scene3.tsx(18,7): error TS6133: 'IMG_WIDTH' is declared but its value
is never read.
src/Scene3.tsx(19,7): error TS6133: 'IMG_HEIGHT' is declared but its value
is never read.
⏺ Update(src/Scene3.tsx)
⎿  Removed 4 lines
14
15 const FILE = "whats3.mov";
16
17 -// sfx-screenshot.png is 1064x1148
18 -const IMG_WIDTH = 1064;
19 -const IMG_HEIGHT = 1148;
20 -
17 export const Scene3: React.FC = () => {
18 const frame = useCurrentFrame();
19 const { fps } = useVideoConfig();
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. The screenshot overlay in Scene3 starts at frame 440 for 4 seconds,
with:
- 0.2s fade in/out
- 1.15x zoom with transformOrigin: "top center"
- Slow pan from top to bottom (translateY 0% to -15%)
✻ Crunched for 52s
❯ import this graphic https://github.com/JonnyBurger/mediaparser-announcement/b
lob/main/src/CodeTransition.tsx
into the project
⏺ Agent(Fetch CodeTransition.tsx and deps)
⎿  Done (14 tool uses · 19.5k tokens · 1m 29s)
(ctrl+o to expand)
⏺ Now I'll install the required dependencies and create all the files.
⏺ Bash(npx remotion add @remotion/google-fonts 2>&1 | tail -5)
⎿  This can lead to bugs, delete all but one of these files.
$ npm i --save-exact --no-fund --no-audit @remotion/google-fonts@4.0.4
37
… +3 lines (ctrl+o to expand)
Read 1 file (ctrl+o to expand)
⏺ Bash(mkdir -p /Users/jonathanburger/whats-new/src/annotations
/Users/jonathanburger/whats-new/src/calculate-metadata)
⎿  Done
⏺ Write(src/code-utils.ts)
⎿  Wrote 26 lines to src/code-utils.ts
1 import { TokenTransition } from "codehike/utils/token-transition
s";
2 import { interpolate, interpolateColors } from "remotion";
3
4 export function applyStyle({
5 element,
6 keyframes,
7 progress,
8 }: {
9 element: HTMLElement;
10 keyframes: TokenTransition["keyframes"];
… +16 lines (ctrl+o to expand)
⏺ Write(src/code-font.ts)
⎿  Wrote 11 lines to src/code-font.ts
1 import { loadFont } from "@remotion/google-fonts/RobotoMono";
2
3 export const { fontFamily, waitUntilDone } = loadFont("normal",
{
4 subsets: ["latin"],
5 weights: ["400", "700"],
6 });
7 export const fontSize = 34;
8 export const tabSize = 3;
9 export const lineHeight = 1.5;
10 export const horizontalPadding = 60;
… +1 line (ctrl+o to expand)
⏺ Write(src/calculate-metadata/theme.tsx)
⎿  Wrote 29 lines to src/calculate-metadata/theme.tsx
1 import { getThemeColors } from "@code-hike/lighter";
2 import React from "react";
3
4 export type ThemeColors = Awaited<ReturnType<typeof getThemeColo
rs>>;
5
6 export const ThemeColorsContext = React.createContext<ThemeColor
s | null>(null);
7
8 export const useThemeColors = () => {
9 const themeColors = React.useContext(ThemeColorsContext);
10 if (!themeColors) {
… +19 lines (ctrl+o to expand)
⏺ Write(src/calculate-metadata/get-text-dimensions.tsx)
⎿  Wrote 22 lines to src/calculate-metadata/get-text-dimensions.tsx
1 import { measureText } from "@remotion/layout-utils";
2 import { tabSize, fontFamily, fontSize, lineHeight } from "../co
de-font";
3
4 export const getTextDimensions = (contents: string) => {
5 const widthPerCharacter = measureText({
6 text: "A",
7 fontFamily,
8 fontSize,
9 validateFontIsLoaded: true,
10 }).width;
… +12 lines (ctrl+o to expand)
⏺ Write(src/annotations/InlineToken.tsx)
⎿  Wrote 8 lines to src/annotations/InlineToken.tsx
1 import { AnnotationHandler, InnerToken } from "codehike/code";
2
3 export const tokenTransitions: AnnotationHandler = {
4 name: "token-transitions",
5 Token: ({ ...props }) => (
6 <InnerToken merge={props} style={{ display: "inline-block" }}
/>
7 ),
8 };
⏺ Write(src/annotations/Callout.tsx)
⎿  Wrote 78 lines to src/annotations/Callout.tsx
1 import {
2 InlineAnnotation,
3 AnnotationHandler,
4 InnerLine,
5 Pre,
6 } from "codehike/code";
7 import { interpolate, useCurrentFrame } from "remotion";
8 import { useThemeColors } from "../calculate-metadata/theme";
9 import { mix, readableColor } from "polished";
… +68 lines (ctrl+o to expand)
⏺ Write(src/annotations/Error.tsx)
⎿  Wrote 76 lines to src/annotations/Error.tsx
1 import { InlineAnnotation, AnnotationHandler, InnerToken } from
"codehike/code";
2 import { interpolate, useCurrentFrame } from "remotion";
3 import { useThemeColors } from "../calculate-metadata/theme";
4 import { mix, readableColor } from "polished";
5
6 export const errorInline: AnnotationHandler = {
7 name: "error",
8 transform: (annotation: InlineAnnotation) => {
9 const { query, lineNumber, data } = annotation;
10 return [
… +66 lines (ctrl+o to expand)
⏺ Write(src/TopExplainer.tsx)
⎿  Wrote 28 lines to src/TopExplainer.tsx
1 import React from "react";
2 import { fontSize } from "./code-font";
3
4 export const PADDING_X = 83;
5 export const TOP_EXPLAINER_HEIGHT = 100;
6
7 export const TopExplainer: React.FC<{
8 children: React.ReactNode;
9 }> = ({ children }) => {
10 return (
… +18 lines (ctrl+o to expand)
⏺ Write(src/CodeTransition.tsx)
⎿  Wrote 185 lines to src/CodeTransition.tsx
1 import {
2 AbsoluteFill,
3 Easing,
4 interpolate,
5 useVideoConfig,
6 } from "remotion";
7 import { continueRender, delayRender, useCurrentFrame } from "rem
otion";
8 import { Pre, HighlightedCode, AnnotationHandler } from "codehike
/code";
9 import React, { useLayoutEffect, useMemo } from "react";
… +175 lines (ctrl+o to expand)
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  Error: Exit code 2
src/calculate-metadata/get-text-dimensions.tsx(16,29): error TS2550:
Property 'replaceAll' does not exist on type 'string'. Do you need to
change your target library? Try changing the 'lib' compiler option to
'es2021' or later.
Read 1 file (ctrl+o to expand)
⏺ Update(tsconfig.json)
⎿  Added 1 line, removed 1 line
5 "jsx": "react-jsx",
6 "strict": true,
7 "noEmit": true,
8 - "lib": ["es2015"],
8 + "lib": ["es2022", "dom"],
9 "esModuleInterop": true,
10 "skipLibCheck": true,
11 "forceConsistentCasingInFileNames": true,
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Imported CodeTransition and all its dependencies:
- src/CodeTransition.tsx — main animated code transition component
- src/code-utils.ts — token transition animation helpers
- src/code-font.ts — Roboto Mono font config
- src/TopExplainer.tsx — header bar component
- src/annotations/Callout.tsx — callout annotation handler
- src/annotations/InlineToken.tsx — inline token transition handler
- src/annotations/Error.tsx — error annotation handler
- src/calculate-metadata/theme.tsx — theme context/provider
- src/calculate-metadata/get-text-dimensions.tsx — text measurement utility
Installed packages: codehike, @remotion/google-fonts, @remotion/layout-utils,
@code-hike/lighter, polished.
✻ Brewed for 4m 1s
❯ register codeTransition as a composition so we can play around wiht it
Read 1 file (ctrl+o to expand)
⏺ I need a wrapper component since CodeTransition expects HighlightedCode props.
Let me create a simple demo composition.
⏺ Write(src/CodeTransitionDemo.tsx)
⎿  Wrote 70 lines to src/CodeTransitionDemo.tsx
1 import { AbsoluteFill } from "remotion";
2 import { highlight } from "codehike/code";
3 import { CodeTransition } from "./CodeTransition";
4 import { ThemeProvider, ThemeColors } from "./calculate-metadata/
theme";
5 import { getThemeColors } from "@code-hike/lighter";
6 import React, { useEffect, useState } from "react";
7
8 const CODE_BEFORE = `
9 import { LightLeak } from "@remotion/light-leaks";
… +60 lines (ctrl+o to expand)
⏺ Update(src/Root.tsx)
⎿  Added 1 line
1 import "./index.css";
2 import { Composition, CalculateMetadataFunction } from "remotion
";
3 import { MyComposition, VIDEO_FILES, SILENCES } from "./Composit
ion";
4 +import { CodeTransitionDemo } from "./CodeTransitionDemo";
5
6 const FPS = 30;
7
⏺ Update(src/Root.tsx)
⎿  Added 8 lines
33 height={1080}
34 calculateMetadata={calculateMetadata}
35 />
36 + <Composition
37 + id="CodeTransitionDemo"
38 + component={CodeTransitionDemo}
39 + durationInFrames={90}
40 + fps={FPS}
41 + width={1920}
42 + height={1080}
43 + />
44 </>
45 );
46 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Registered a CodeTransitionDemo composition (90 frames, 30fps) in
Root.tsx. It shows a code transition from a basic TransitionSeries to one with
a LightLeak overlay, using the github-light theme. You can select it in the
Remotion Studio sidebar to play with it.
✻ Brewed for 46s
❯ hmm, there are some bugs, did we use the same codehike version
⏺ Bash(npm ls codehike 2>&1 && echo "---" && cat
/Users/jonathanburger/whats-new/node_modules/codehike/package.json | grep
'"version"')
⎿  whats-new@1.0.0 /Users/jonathanburger/whats-new
└── codehike@1.1.0
… +2 lines (ctrl+o to expand)
Searched for 4 patterns (ctrl+o to expand)
⏺ The source project uses codehike 1.0.4 but we installed 1.1.0. Let me
downgrade to match.
⏺ Bash(npm install --save-exact codehike@1.0.4 2>&1 | tail -3)
⎿   npm audit fix --force
Run `npm audit` for details.
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Downgraded codehike from 1.1.0 to 1.0.4 to match the source project. Should
fix the bugs.
❯ let's add a new SlideInOverlay at frame 800 in scene 3.
get all URLS from @remotion/sfx and display them. use generous padding and
appropriate font sizes for the dimensions of the overlay. repeat the URLs.
slowly scroll vertically.
add absolutefills at top and bottom which fade from white to transparent to
mask the scrolling.
Read 1 file (ctrl+o to expand)
⏺ Now let me check the sfx skill for the URLs, and the SlideInOverlay component.
Read 1 file (ctrl+o to expand)
⏺ The SlideInOverlay takes startAt in seconds and wraps both background and
children. But for Scene3, the video is already the background of the first
SlideInOverlay. I need to add a second overlay as a Sequence at frame 800. Let
me use it directly.
⏺ Write(src/Scene3.tsx)
⎿  Added 98 lines, removed 5 lines
14
15 const FILE = "whats3.mov";
16
17 +const SFX_URLS = [
18 + "https://remotion.media/whip.wav",
19 + "https://remotion.media/whoosh.wav",
20 + "https://remotion.media/page-turn.wav",
21 + "https://remotion.media/switch.wav",
22 + "https://remotion.media/mouse-click.wav",
23 + "https://remotion.media/shutter-modern.wav",
24 + "https://remotion.media/shutter-old.wav",
25 + "https://remotion.media/ding.wav",
26 + "https://remotion.media/bruh.wav",
27 + "https://remotion.media/vine-boom.wav",
28 + "https://remotion.media/windows-xp-error.wav",
29 +];
30 +
31 +// Repeat URLs enough to fill scroll
32 +const REPEATED_URLS = [...SFX_URLS, ...SFX_URLS, ...SFX_URLS,
+...SFX_URLS];
33 +
34 +const SfxUrlList: React.FC = () => {
35 + const frame = useCurrentFrame();
36 + const { fps } = useVideoConfig();
37 +
38 + const LINE_HEIGHT = 52;
39 + const totalHeight = REPEATED_URLS.length * LINE_HEIGHT;
40 +
41 + const scrollY = interpolate(
42 + frame,
43 + [0, 8 * fps],
44 + [0, -totalHeight / 2],
45 + { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
46 + );
47 +
48 + const FADE_HEIGHT = 80;
49 +
50 + return (
51 + <AbsoluteFill style={{ backgroundColor: "white", overflow:
+ "hidden" }}>
52 + <div
53 + style={{
54 + transform: `translateY(${scrollY}px)`,
55 + padding: "80px 40px",
56 + }}
57 + >
58 + {REPEATED_URLS.map((url, i) => (
59 + <div
60 + key={i}
61 + style={{
62 + fontFamily: "monospace",
63 + fontSize: 22,
64 + fontWeight: 500,
65 + color: "#333",
66 + height: LINE_HEIGHT,
67 + display: "flex",
68 + alignItems: "center",
69 + whiteSpace: "nowrap",
70 + }}
71 + >
72 + {url}
73 + </div>
74 + ))}
75 + </div>
76 + {/* Top fade mask */}
77 + <AbsoluteFill
78 + style={{
79 + height: FADE_HEIGHT,
80 + bottom: "auto",
81 + background: "linear-gradient(to bottom, white, trans
+parent)",
82 + pointerEvents: "none",
83 + }}
84 + />
85 + {/* Bottom fade mask */}
86 + <AbsoluteFill
87 + style={{
88 + height: FADE_HEIGHT,
89 + top: "auto",
90 + background: "linear-gradient(to top, white, transpar
+ent)",
91 + pointerEvents: "none",
92 + }}
93 + />
94 + </AbsoluteFill>
95 + );
96 +};
97 +
98 export const Scene3: React.FC = () => {
99 const frame = useCurrentFrame();
100 const { fps } = useVideoConfig();
...
115 { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
116 );
117
37 - // Zoom in slightly (1.15x) and pan from top to bottom
118 const ssScale = 1.15;
39 - // At scale 1.15, the image is bigger than the container.
40 - // We pan the image vertically from showing the top to showi
-ng the bottom.
41 - // The visible height at this scale = containerHeight / scal
-e
42 - // The overflow = imgDisplayHeight - visibleHeight
119 const ssTranslateY = interpolate(
120 localFrame,
121 [0, ssDuration],
...
123 { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
124 );
125
126 + // SFX URL list overlay at frame 800
127 + const sfxStartAt = 800 / fps;
128 +
129 return (
130 <AbsoluteFill>
131 <SlideInOverlay
...
160 />
161 </AbsoluteFill>
162 </Sequence>
163 + <Sequence from={800} layout="none">
164 + <SlideInOverlay
165 + startAt={0}
166 + background={
167 + <Video
168 + src={staticFile(FILE)}
169 + trimBefore={trimBefore}
170 + trimAfter={trimAfter}
171 + />
172 + }
173 + >
174 + <SfxUrlList />
175 + </SlideInOverlay>
176 + </Sequence>
177 </AbsoluteFill>
178 );
179 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  Error: Exit code 2
src/Scene3.tsx(127,9): error TS6133: 'sfxStartAt' is declared but its value
is never read.
⏺ Update(src/Scene3.tsx)
⎿  Removed 3 lines
123 { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
124 );
125
126 - // SFX URL list overlay at frame 800
127 - const sfxStartAt = 800 / fps;
128 -
126 return (
127 <AbsoluteFill>
128 <SlideInOverlay
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. At frame 800 in Scene3, a new SlideInOverlay appears with:
- All @remotion/sfx URLs displayed in monospace (22px) with 52px line height
and 40px horizontal padding
- URLs repeated 4x to fill the scroll area
- Slow vertical scroll over 8 seconds
- White-to-transparent gradient masks at top and bottom (80px each) to fade
the edges
✻ Baked for 55s
❯ the video is now duplicated for no apparent reason.
we need to refactor the SlideInOverlay to not take a background. a background
should be able to take multiple slide overlays
Read 1 file (ctrl+o to expand)
⏺ I'll refactor SlideInOverlay to only render the sliding panel (no background),
and export a useSlideInProgress hook so the parent can shift the background
based on the combined progress of multiple overlays.
⏺ Write(src/SlideInOverlay.tsx)
⎿  Added 36 lines, removed 28 lines
7 } from "remotion";
8
9 type SlideInOverlayProps = {
10 - /** The main background content (e.g. a video) */
11 - background: React.ReactNode;
10 /** Content rendered inside the sliding panel */
11 children: React.ReactNode;
12 /** When the slide-in starts, in seconds */
13 startAt: number;
16 - /** Duration of the slide-in animation, in seconds. Default:
-1.5 */
14 + /** Duration of the slide-in animation, in seconds. Default:
+1 */
15 slideInDuration?: number;
16 /** Duration the overlay stays fully visible, in seconds. Def
ault: 3.5 */
17 holdDuration?: number;
20 - /** Duration of the slide-out animation, in seconds. Default:
- 1.5 */
18 + /** Duration of the slide-out animation, in seconds. Default:
+ 1 */
19 slideOutDuration?: number;
20 /** Width of the overlay as a percentage of the composition.
Default: 40 */
21 widthPercent?: number;
24 - /** How much the background shifts left as a percentage. Defa
-ult: 20 */
25 - backgroundShift?: number;
22 /** Background color of the overlay panel. Default: "white" *
/
23 backgroundColor?: string;
24 };
25
30 -export const SlideInOverlay: React.FC<SlideInOverlayProps> = ({
31 - background,
32 - children,
26 +export const useSlideInProgress = ({
27 startAt,
28 slideInDuration = 1,
29 holdDuration = 3.5,
30 slideOutDuration = 1,
37 - widthPercent = 40,
38 - backgroundShift = 20,
39 - backgroundColor = "white",
31 +}: {
32 + startAt: number;
33 + slideInDuration?: number;
34 + holdDuration?: number;
35 + slideOutDuration?: number;
36 }) => {
37 const frame = useCurrentFrame();
38 const { fps } = useVideoConfig();
...
62 extrapolateRight: "clamp",
63 },
64 );
69 - const progress = slideIn - slideOut;
65
66 + return slideIn - slideOut;
67 +};
68 +
69 +export const SlideInOverlay: React.FC<SlideInOverlayProps> = ({
70 + children,
71 + startAt,
72 + slideInDuration = 1,
73 + holdDuration = 3.5,
74 + slideOutDuration = 1,
75 + widthPercent = 40,
76 + backgroundColor = "white",
77 +}) => {
78 + const progress = useSlideInProgress({
79 + startAt,
80 + slideInDuration,
81 + holdDuration,
82 + slideOutDuration,
83 + });
84 +
85 const overlayX = interpolate(progress, [0, 1], [102, 0]);
72 - const videoX = interpolate(progress, [0, 1], [0, -backgroundS
-hift]);
86
87 return (
75 - <AbsoluteFill>
76 - <AbsoluteFill style={{ transform: `translateX(${videoX}%)
-` }}>
77 - {background}
78 - </AbsoluteFill>
79 - <AbsoluteFill
80 - style={{
81 - left: `${100 - widthPercent}%`,
82 - width: `${widthPercent}%`,
83 - transform: `translateX(${overlayX}%)`,
84 - backgroundColor,
85 - }}
86 - >
87 - {children}
88 - </AbsoluteFill>
88 + <AbsoluteFill
89 + style={{
90 + left: `${100 - widthPercent}%`,
91 + width: `${widthPercent}%`,
92 + transform: `translateX(${overlayX}%)`,
93 + backgroundColor,
94 + }}
95 + >
96 + {children}
97 </AbsoluteFill>
98 );
99 };
⏺ Now update Scene2 to use the new API:
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 1 line
9 import { Video } from "@remotion/media";
10 import { SILENCES } from "./Composition";
11 import { LightLeakGrid } from "./LightLeakGrid";
12 -import { SlideInOverlay } from "./SlideInOverlay";
12 +import { SlideInOverlay, useSlideInProgress } from "./SlideInOv
+erlay";
13 import { NumberedChapter } from "./NumberedChapter";
14 import { Prompt } from "./Prompt";
15
⏺ Update(src/Scene2.tsx)
⎿  Added 11 lines, removed 10 lines
33 { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
34 );
35
36 + const overlayProgress = useSlideInProgress({ startAt: 0.5 });
37 + const videoX = interpolate(overlayProgress, [0, 1], [0, -20])
+;
38 +
39 return (
40 <AbsoluteFill>
38 - <SlideInOverlay
39 - startAt={0.5}
40 - background={
41 - <Video
42 - src={staticFile(FILE)}
43 - trimBefore={trimBefore}
44 - trimAfter={trimAfter}
45 - />
46 - }
47 - >
41 + <AbsoluteFill style={{ transform: `translateX(${videoX}%)
+` }}>
42 + <Video
43 + src={staticFile(FILE)}
44 + trimBefore={trimBefore}
45 + trimAfter={trimAfter}
46 + />
47 + </AbsoluteFill>
48 + <SlideInOverlay startAt={0.5}>
49 <NumberedChapter chapterNumber={1} chapterTitle="Light
Leaks" />
50 </SlideInOverlay>
51 <Sequence from={540} durationInFrames={Math.round(3 * fps
)} layout="none">
⏺ Now update Scene3:
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene3.tsx)
⎿  Added 1 line, removed 1 line
9 } from "remotion";
10 import { Video } from "@remotion/media";
11 import { SILENCES } from "./Composition";
12 -import { SlideInOverlay } from "./SlideInOverlay";
12 +import { SlideInOverlay, useSlideInProgress } from "./SlideInOv
+erlay";
13 import { NumberedChapter } from "./NumberedChapter";
14
15 const FILE = "whats3.mov";
⏺ Update(src/Scene3.tsx)
⎿  Added 17 lines, removed 24 lines
123 { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
124 );
125
126 + // Combine progress from both overlays to shift background
127 + const overlay1Progress = useSlideInProgress({ startAt: 0.5 }
+);
128 + const overlay2Progress = useSlideInProgress({ startAt: 800 /
+ fps });
129 + const combinedProgress = Math.max(overlay1Progress, overlay2
+Progress);
130 + const videoX = interpolate(combinedProgress, [0, 1], [0, -20
+]);
131 +
132 return (
133 <AbsoluteFill>
128 - <SlideInOverlay
129 - startAt={0.5}
130 - background={
131 - <Video
132 - src={staticFile(FILE)}
133 - trimBefore={trimBefore}
134 - trimAfter={trimAfter}
135 - />
136 - }
137 - >
134 + <AbsoluteFill style={{ transform: `translateX(${videoX}%
+)` }}>
135 + <Video
136 + src={staticFile(FILE)}
137 + trimBefore={trimBefore}
138 + trimAfter={trimAfter}
139 + />
140 + </AbsoluteFill>
141 + <SlideInOverlay startAt={0.5}>
142 <NumberedChapter chapterNumber={2} chapterTitle="Sound
Effects" />
143 </SlideInOverlay>
144 <Sequence from={ssStart} durationInFrames={ssDuration} l
ayout="none">
...
161 />
162 </AbsoluteFill>
163 </Sequence>
160 - <Sequence from={800} layout="none">
161 - <SlideInOverlay
162 - startAt={0}
163 - background={
164 - <Video
165 - src={staticFile(FILE)}
166 - trimBefore={trimBefore}
167 - trimAfter={trimAfter}
168 - />
169 - }
170 - >
171 - <SfxUrlList />
172 - </SlideInOverlay>
173 - </Sequence>
164 + <SlideInOverlay startAt={800 / fps}>
165 + <SfxUrlList />
166 + </SlideInOverlay>
167 </AbsoluteFill>
168 );
169 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Refactored SlideInOverlay:
- No longer takes a background prop — it only renders the sliding panel
- Exports useSlideInProgress hook — returns a 0→1→0 progress value for a given
timing config
- Background is managed by the parent — uses Math.max() of multiple overlay
progresses to compute the video shift
Scene2 uses one overlay, Scene3 uses two overlays with combined progress —
single video, no duplication.
✻ Churned for 1m 7s
❯ from the overlay we just created, remove the https:// from hte URLs.
make the font way bigger. use GT Planar as the font, increase the font weight
⏺ Update(src/Scene3.tsx)
⎿  Added 1 line, removed 1 line
69 whiteSpace: "nowrap",
70 }}
71 >
72 - {url}
72 + {url.replace("https://", "")}
73 </div>
74 ))}
75 </div>
⏺ Update(src/Scene3.tsx)
⎿  Added 3 lines, removed 3 lines
59 <div
60 key={i}
61 style={{
62 - fontFamily: "monospace",
63 - fontSize: 22,
64 - fontWeight: 500,
62 + fontFamily: "GT Planar",
63 + fontSize: 38,
64 + fontWeight: 700,
65 color: "#333",
66 height: LINE_HEIGHT,
67 display: "flex",
⏺ Also bump the line height to match the bigger font:
⏺ Update(src/Scene3.tsx)
⎿  Added 1 line, removed 1 line
35 const frame = useCurrentFrame();
36 const { fps } = useVideoConfig();
37
38 - const LINE_HEIGHT = 52;
38 + const LINE_HEIGHT = 72;
39 const totalHeight = REPEATED_URLS.length * LINE_HEIGHT;
40
41 const scrollY = interpolate(
⏺ Done. URLs now show without https://, in GT Planar at 38px / weight 700 with
72px line height.
❯ add way more padding. like 3x more padding inbetween
⏺ Update(src/Scene3.tsx)
⎿  Added 1 line, removed 1 line
35 const frame = useCurrentFrame();
36 const { fps } = useVideoConfig();
37
38 - const LINE_HEIGHT = 72;
38 + const LINE_HEIGHT = 216;
39 const totalHeight = REPEATED_URLS.length * LINE_HEIGHT;
40
41 const scrollY = interpolate(
⏺ Done.
❯ increase the font size further
⏺ Update(src/Scene3.tsx)
⎿  Added 1 line, removed 1 line
60 key={i}
61 style={{
62 fontFamily: "GT Planar",
63 - fontSize: 38,
63 + fontSize: 54,
64 fontWeight: 700,
65 color: "#333",
66 height: LINE_HEIGHT,
⏺ Done.
❯ start the overlay 5 seconds earlier.
decrease the line height now a bit.
also, I want the list of URLs to scroll up slowly, but linearly, I cannot
observe this happening
Read 1 file (ctrl+o to expand)
⏺ The scroll is using frame from useCurrentFrame() but SfxUrlList is rendered
inside a SlideInOverlay which doesn't use a Sequence — so frame starts at 0
for the whole scene, not from when the overlay appears. The scroll happens
relative to the scene start, meaning it's already scrolled past by frame 800.
Let me fix this by making the scroll relative to when the component actually
becomes visible, and use a slower scroll speed.
⏺ Update(src/Scene3.tsx)
⎿  Added 3 lines, removed 7 lines
35 const frame = useCurrentFrame();
36 const { fps } = useVideoConfig();
37
38 - const LINE_HEIGHT = 216;
38 + const LINE_HEIGHT = 160;
39 const totalHeight = REPEATED_URLS.length * LINE_HEIGHT;
40 + const SCROLL_SPEED = 40; // pixels per second
41
41 - const scrollY = interpolate(
42 - frame,
43 - [0, 8 * fps],
44 - [0, -totalHeight / 2],
45 - { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
46 - );
42 + const scrollY = -(frame / fps) * SCROLL_SPEED;
43
44 const FADE_HEIGHT = 80;
45
⏺ Now move the overlay 5 seconds earlier (frame 800 → frame 650, i.e. ~5s at
30fps):
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene3.tsx)
⎿  Added 1 line, removed 1 line
121
122 // Combine progress from both overlays to shift background
123 const overlay1Progress = useSlideInProgress({ startAt: 0.5 }
);
124 - const overlay2Progress = useSlideInProgress({ startAt: 800 /
- fps });
124 + const overlay2Progress = useSlideInProgress({ startAt: 650 /
+ fps });
125 const combinedProgress = Math.max(overlay1Progress, overlay2
Progress);
126 const videoX = interpolate(combinedProgress, [0, 1], [0, -20
]);
127
⏺ Now wrap the SfxUrlList in a Sequence so its useCurrentFrame() starts from 0
when visible:
⏺ Update(src/Scene3.tsx)
⎿  Error editing file
Searched for 1 pattern, read 1 file (ctrl+o to expand)
⏺ The second replace_all only matched the hook call, not this one. Let me fix
it:
⏺ Update(src/Scene3.tsx)
⎿  Added 5 lines, removed 3 lines
157 />
158 </AbsoluteFill>
159 </Sequence>
160 - <SlideInOverlay startAt={800 / fps}>
161 - <SfxUrlList />
162 - </SlideInOverlay>
160 + <Sequence from={650} layout="none">
161 + <SlideInOverlay startAt={0}>
162 + <SfxUrlList />
163 + </SlideInOverlay>
164 + </Sequence>
165 </AbsoluteFill>
166 );
167 };
⏺ Also fix the hook call to match:
Read 1 file (ctrl+o to expand)
⏺ The hook can't be inside a Sequence, so it still needs the absolute time. But
now the SlideInOverlay uses startAt={0} relative to the Sequence. The hook
needs to stay at the scene level with the absolute time:
⏺ Update(src/Scene3.tsx)
⎿  Added 1 line, removed 1 line
121
122 // Combine progress from both overlays to shift background
123 const overlay1Progress = useSlideInProgress({ startAt: 0.5 }
);
124 - const overlay2Progress = useSlideInProgress({ startAt: 650 /
- fps });
124 + const overlay2Progress = useSlideInProgress({ startAt: 650 /
+ fps, slideInDuration: 1, holdDuration: 3.5, slideOutDuration:
+ 1 });
125 const combinedProgress = Math.max(overlay1Progress, overlay2
Progress);
126 const videoX = interpolate(combinedProgress, [0, 1], [0, -20
]);
127
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  Error: Exit code 2
src/Scene3.tsx(39,9): error TS6133: 'totalHeight' is declared but its value
is never read.
⏺ Update(src/Scene3.tsx)
⎿  Removed 1 line
36 const { fps } = useVideoConfig();
37
38 const LINE_HEIGHT = 160;
39 - const totalHeight = REPEATED_URLS.length * LINE_HEIGHT;
39 const SCROLL_SPEED = 40; // pixels per second
40
41 const scrollY = -(frame / fps) * SCROLL_SPEED;
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. The SFX URL overlay now:
- Starts 5 seconds earlier (frame 650 instead of 800)
- Line height reduced to 160px
- Scrolls linearly at 40px/sec using useCurrentFrame() relative to the
Sequence start
✻ Sautéed for 1m 20s
❯ in scene4, add the same intro slide as in scene2 and scene3, it should say
3. Render on Vercel
Searched for 1 pattern (ctrl+o to expand)
⏺ Write(src/Scene4.tsx)
⎿  Wrote 32 lines to src/Scene4.tsx
1 import { AbsoluteFill, interpolate, staticFile, useVideoConfig }
from "remotion";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 import { NumberedChapter } from "./NumberedChapter";
6
7 const FILE = "whats4.mov";
8
9 export const Scene4: React.FC = () => {
10 const { fps } = useVideoConfig();
… +22 lines (ctrl+o to expand)
Read 1 file (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 1 line
4 import { LightLeak } from "@remotion/light-leaks";
5 import { Scene2 } from "./Scene2";
6 import { Scene3 } from "./Scene3";
7 +import { Scene4 } from "./Scene4";
8
9 export const VIDEO_FILES = [
10 "whats1.mov",
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
69
70 elements.push(
71 <TransitionSeries.Sequence key={file} durationInFra
mes={durationInFrames} premountFor={30}>
72 - {file === "whats2.mov" ? <Scene2 /> : file === "w
-hats3.mov" ? <Scene3 /> : <VideoScene file={file} />}
72 + {file === "whats2.mov" ? <Scene2 /> : file === "w
+hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
+<VideoScene file={file} />}
73 </TransitionSeries.Sequence>,
74 );
75
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created Scene4.tsx with the same slide-in overlay pattern, showing
<NumberedChapter chapterNumber={3} chapterTitle="Render on Vercel" />.
✻ Baked for 45s
❯ look at recent downloads in the downloads folder, these videos should replace
the ones currently in the public/ folder.
I applied audio enhancement on them other than that they are the same videos
Read 1 file (ctrl+o to expand)
⏺ All 11 enhanced files are there. I'll copy them over, renaming to match the
original filenames.
⏺ Bash(for i in 1 2 3 4 5 6 7 8 9 10 11; do
src=$(ls /Users/jonathanburger/Downloads/whats${i}-esv2-*.mov
2>/dev/null)…)
⎿  Copied whats1
Copied whats2
Copied whats3
… +8 lines (ctrl+o to expand)
⏺ Done. All 11 enhanced audio videos have been copied to public/, replacing the
originals.
❯ the "Render on Vercel" overlay does not have to be that long, 2.5sec should
be sufficient.
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line, removed 1 line
12 const trimBefore = Math.floor(silence.leadingEnd * fps);
13 const trimAfter = Math.ceil(silence.trailingStart * fps);
14
15 - const overlayProgress = useSlideInProgress({ startAt: 0.5 });
15 + const overlayProgress = useSlideInProgress({ startAt: 0.5, ho
+ldDuration: 2.5 });
16 const videoX = interpolate(overlayProgress, [0, 1], [0, -20])
;
17
18 return (
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line, removed 1 line
24 trimAfter={trimAfter}
25 />
26 </AbsoluteFill>
27 - <SlideInOverlay startAt={0.5}>
27 + <SlideInOverlay startAt={0.5} holdDuration={2.5}>
28 <NumberedChapter chapterNumber={3} chapterTitle="Render
on Vercel" />
29 </SlideInOverlay>
30 </AbsoluteFill>
⏺ Done. Hold duration is now 2.5s.
❯ also, duplicate the light leak transition from that other scene and insert it
before the vercel scene. extend the trim a bit so there is enough pause in the
speakers words for such transiiton
Read 1 file (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 19 lines, removed 2 lines
77 if (index === 1) {
78 elements.push(
79 <TransitionSeries.Overlay key="ll-2-3" durationIn
Frames={overlayDuration}>
80 - <AbsoluteFill >
80 + <AbsoluteFill>
81 <LightLeak seed={14} style={{ opacity: 0.7 }}
/>
82 </AbsoluteFill>
83 - <AbsoluteFill >
83 + <AbsoluteFill>
84 <LightLeak seed={10} style={{ opacity: 0.7 }}
/>
85 </AbsoluteFill>
86 <Sequence from={0} layout="none">
...
90 );
91 }
92
93 + // Light leak overlay + whoosh between scene 3 and 4
94 + if (index === 2) {
95 + elements.push(
96 + <TransitionSeries.Overlay key="ll-3-4" durationI
+nFrames={overlayDuration}>
97 + <AbsoluteFill>
98 + <LightLeak seed={8} style={{ opacity: 0.7 }}
+ />
99 + </AbsoluteFill>
100 + <AbsoluteFill>
101 + <LightLeak seed={19} style={{ opacity: 0.7 }
+} />
102 + </AbsoluteFill>
103 + <Sequence from={0} layout="none">
104 + <Audio src="https://remotion.media/whoosh.wa
+v" volume={0.1} />
105 + </Sequence>
106 + </TransitionSeries.Overlay>,
107 + );
108 + }
109 +
110 return elements;
111 })}
112 </TransitionSeries>
⏺ Now loosen the trims for scenes 3 and 4:
⏺ Update(src/Composition.tsx)
⎿  Added 2 lines, removed 2 lines
26 {
27 "whats1.mov": { leadingEnd: 0, trailingStart: 4.67 },
28 "whats2.mov": { leadingEnd: 6.37, trailingStart: 31.8 },
29 - "whats3.mov": { leadingEnd: 2.3, trailingStart: 43.81 },
30 - "whats4.mov": { leadingEnd: 2.24, trailingStart: 38.77 },
29 + "whats3.mov": { leadingEnd: 2.3, trailingStart: 44.5 },
30 + "whats4.mov": { leadingEnd: 1.5, trailingStart: 38.77 },
31 "whats5.mov": { leadingEnd: 3.04, trailingStart: 25.31 },
32 "whats6.mov": { leadingEnd: 2.32, trailingStart: 31.64 },
33 "whats7.mov": { leadingEnd: 4.21, trailingStart: 39.27 },
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Added a light leak transition (different seeds: 8, 19) + whoosh between
scenes 3 and 4, and loosened the trims — scene 3 ends later (44.5s) and scene
4 starts earlier (1.5s) to give breathing room around the transition.
❯ in scene5, also add an overlay like in scene4, it should say "4. New Skills"
⏺ Write(src/Scene5.tsx)
⎿  Wrote 32 lines to src/Scene5.tsx
1 import { AbsoluteFill, interpolate, staticFile, useVideoConfig }
from "remotion";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 import { NumberedChapter } from "./NumberedChapter";
6
7 const FILE = "whats5.mov";
8
9 export const Scene5: React.FC = () => {
10 const { fps } = useVideoConfig();
… +22 lines (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 1 line
5 import { Scene2 } from "./Scene2";
6 import { Scene3 } from "./Scene3";
7 import { Scene4 } from "./Scene4";
8 +import { Scene5 } from "./Scene5";
9
10 export const VIDEO_FILES = [
11 "whats1.mov",
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
70
71 elements.push(
72 <TransitionSeries.Sequence key={file} durationInFra
mes={durationInFrames} premountFor={30}>
73 - {file === "whats2.mov" ? <Scene2 /> : file === "w
-hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
-<VideoScene file={file} />}
73 + {file === "whats2.mov" ? <Scene2 /> : file === "w
+hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
+file === "whats5.mov" ? <Scene5 /> : <VideoScene file={file} />
+}
74 </TransitionSeries.Sequence>,
75 );
76
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created Scene5.tsx with a 2.5s hold overlay showing "4. New Skills",
wired into the composition for whats5.mov.
❯ in scene 6, we have the same slide, but it should say 5. Web Renderer
Progress
⏺ Write(src/Scene6.tsx)
⎿  Wrote 32 lines to src/Scene6.tsx
1 import { AbsoluteFill, interpolate, staticFile, useVideoConfig }
from "remotion";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 import { NumberedChapter } from "./NumberedChapter";
6
7 const FILE = "whats6.mov";
8
9 export const Scene6: React.FC = () => {
10 const { fps } = useVideoConfig();
… +22 lines (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 1 line
6 import { Scene3 } from "./Scene3";
7 import { Scene4 } from "./Scene4";
8 import { Scene5 } from "./Scene5";
9 +import { Scene6 } from "./Scene6";
10
11 export const VIDEO_FILES = [
12 "whats1.mov",
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
71
72 elements.push(
73 <TransitionSeries.Sequence key={file} durationInFra
mes={durationInFrames} premountFor={30}>
74 - {file === "whats2.mov" ? <Scene2 /> : file === "w
-hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
-file === "whats5.mov" ? <Scene5 /> : <VideoScene file={file} />
-}
74 + {file === "whats2.mov" ? <Scene2 /> : file === "w
+hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
+file === "whats5.mov" ? <Scene5 /> : file === "whats6.mov" ? <S
+cene6 /> : <VideoScene file={file} />}
75 </TransitionSeries.Sequence>,
76 );
77
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created Scene6.tsx with "5. Web Renderer Progress" overlay, wired into
whats6.mov.
❯ in scene 7:
6. Work better with Agents
⏺ Write(src/Scene7.tsx)
⎿  Wrote 32 lines to src/Scene7.tsx
1 import { AbsoluteFill, interpolate, staticFile, useVideoConfig }
from "remotion";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 import { NumberedChapter } from "./NumberedChapter";
6
7 const FILE = "whats7.mov";
8
9 export const Scene7: React.FC = () => {
10 const { fps } = useVideoConfig();
… +22 lines (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 1 line
7 import { Scene4 } from "./Scene4";
8 import { Scene5 } from "./Scene5";
9 import { Scene6 } from "./Scene6";
10 +import { Scene7 } from "./Scene7";
11
12 export const VIDEO_FILES = [
13 "whats1.mov",
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
72
73 elements.push(
74 <TransitionSeries.Sequence key={file} durationInFra
mes={durationInFrames} premountFor={30}>
75 - {file === "whats2.mov" ? <Scene2 /> : file === "w
-hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
-file === "whats5.mov" ? <Scene5 /> : file === "whats6.mov" ? <S
-cene6 /> : <VideoScene file={file} />}
75 + {file === "whats2.mov" ? <Scene2 /> : file === "w
+hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
+file === "whats5.mov" ? <Scene5 /> : file === "whats6.mov" ? <S
+cene6 /> : file === "whats7.mov" ? <Scene7 /> : <VideoScene fil
+e={file} />}
76 </TransitionSeries.Sequence>,
77 );
78
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Scene7 with "6. Work better with Agents" overlay on whats7.mov.
❯ scene 8: Rspack
scene 9: Preview: Visual Mode
⏺ Write(src/Scene8.tsx)
⎿  Wrote 32 lines to src/Scene8.tsx
1 import { AbsoluteFill, interpolate, staticFile, useVideoConfig }
from "remotion";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 import { NumberedChapter } from "./NumberedChapter";
6
7 const FILE = "whats8.mov";
8
9 export const Scene8: React.FC = () => {
10 const { fps } = useVideoConfig();
… +22 lines (ctrl+o to expand)
⏺ Write(src/Scene9.tsx)
⎿  Wrote 32 lines to src/Scene9.tsx
1 import { AbsoluteFill, interpolate, staticFile, useVideoConfig }
from "remotion";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 import { NumberedChapter } from "./NumberedChapter";
6
7 const FILE = "whats9.mov";
8
9 export const Scene9: React.FC = () => {
10 const { fps } = useVideoConfig();
… +22 lines (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 2 lines
8 import { Scene5 } from "./Scene5";
9 import { Scene6 } from "./Scene6";
10 import { Scene7 } from "./Scene7";
11 +import { Scene8 } from "./Scene8";
12 +import { Scene9 } from "./Scene9";
13
14 export const VIDEO_FILES = [
15 "whats1.mov",
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
74
75 elements.push(
76 <TransitionSeries.Sequence key={file} durationInFra
mes={durationInFrames} premountFor={30}>
77 - {file === "whats2.mov" ? <Scene2 /> : file === "w
-hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
-file === "whats5.mov" ? <Scene5 /> : file === "whats6.mov" ? <S
-cene6 /> : file === "whats7.mov" ? <Scene7 /> : <VideoScene fil
-e={file} />}
77 + {file === "whats2.mov" ? <Scene2 /> : file === "w
+hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
+file === "whats5.mov" ? <Scene5 /> : file === "whats6.mov" ? <S
+cene6 /> : file === "whats7.mov" ? <Scene7 /> : file === "whats
+8.mov" ? <Scene8 /> : file === "whats9.mov" ? <Scene9 /> : <Vid
+eoScene file={file} />}
78 </TransitionSeries.Sequence>,
79 );
80
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Scene8 with "7. Rspack" and Scene9 with "8. Preview: Visual Mode".
✻ Cogitated for 37s
❯ in the transitionseries, apply the name="" prop and give each scene an
appropriate name
Read 1 file (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 14 lines
25 "whats11.mov",
26 ];
27
28 +const SCENE_NAMES: Record<string, string> = {
29 + "whats1.mov": "Intro",
30 + "whats2.mov": "Light Leaks",
31 + "whats3.mov": "Sound Effects",
32 + "whats4.mov": "Render on Vercel",
33 + "whats5.mov": "New Skills",
34 + "whats6.mov": "Web Renderer Progress",
35 + "whats7.mov": "Work better with Agents",
36 + "whats8.mov": "Rspack",
37 + "whats9.mov": "Preview: Visual Mode",
38 + "whats10.mov": "Mediabunny",
39 + "whats11.mov": "Outro",
40 +};
41 +
42 // Leading silence end (seconds) and trailing silence start (se
conds) for each video
43 // Detected via ffmpeg silencedetect using adaptive per-video E
BU R128 loudness threshold
44 export const SILENCES: Record<string, { leadingEnd: number; tra
ilingStart: number }> =
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
87 const elements: React.ReactNode[] = [];
88
89 elements.push(
90 - <TransitionSeries.Sequence key={file} durationInFra
-mes={durationInFrames} premountFor={30}>
90 + <TransitionSeries.Sequence key={file} durationInFra
+mes={durationInFrames} premountFor={30} name={SCENE_NAMES[file]
+}>
91 {file === "whats2.mov" ? <Scene2 /> : file === "w
hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
file === "whats5.mov" ? <Scene5 /> : file === "whats6.mov" ? <S
cene6 /> : file === "whats7.mov" ? <Scene7 /> : file === "whats
8.mov" ? <Scene8 /> : file === "whats9.mov" ? <Scene9 /> : <Vid
eoScene file={file} />}
92 </TransitionSeries.Sequence>,
93 );
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Each TransitionSeries.Sequence now has a descriptive name prop: Intro,
Light Leaks, Sound Effects, Render on Vercel, New Skills, Web Renderer
Progress, Work better with Agents, Rspack, Preview: Visual Mode, Mediabunny,
and Outro.
❯ in th SfxUrlList, make the font size smaller and reduce the font weight.
expand the areas that mask to be highr
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene3.tsx)
⎿  Added 2 lines, removed 2 lines
55 key={i}
56 style={{
57 fontFamily: "GT Planar",
58 - fontSize: 54,
59 - fontWeight: 700,
58 + fontSize: 38,
59 + fontWeight: 500,
60 color: "#333",
61 height: LINE_HEIGHT,
62 display: "flex",
⏺ Update(src/Scene3.tsx)
⎿  Added 1 line, removed 1 line
40
41 const scrollY = -(frame / fps) * SCROLL_SPEED;
42
43 - const FADE_HEIGHT = 80;
43 + const FADE_HEIGHT = 200;
44
45 return (
46 <AbsoluteFill style={{ backgroundColor: "white", overflow:
"hidden" }}>
⏺ Done. Font is now 38px / weight 500, and fade masks are 200px tall.
❯ add a subtle gray divider between the items. make it the full widht of the
overlay.
also, start the overlay 2 seconds earlier
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene3.tsx)
⎿  Added 4 lines
62 display: "flex",
63 alignItems: "center",
64 whiteSpace: "nowrap",
65 + borderBottom: "1px solid #e0e0e0",
66 + marginLeft: -40,
67 + marginRight: -40,
68 + paddingLeft: 40,
69 }}
70 >
71 {url.replace("https://", "")}
⏺ Now move the overlay 2 seconds earlier (60 frames at 30fps):
Searched for 2 patterns, read 1 file (ctrl+o to expand)
⏺ Update(src/Scene3.tsx)
⎿  Added 2 lines, removed 2 lines
124
125 // Combine progress from both overlays to shift background
126 const overlay1Progress = useSlideInProgress({ startAt: 0.5 }
);
127 - const overlay2Progress = useSlideInProgress({ startAt: 650 /
- fps, slideInDuration: 1, holdDuration: 3.5, slideOutDuration:
- 1 });
127 + const overlay2Progress = useSlideInProgress({ startAt: 590 /
+ fps, slideInDuration: 1, holdDuration: 3.5, slideOutDuration:
+ 1 });
128 const combinedProgress = Math.max(overlay1Progress, overlay2
Progress);
129 const videoX = interpolate(combinedProgress, [0, 1], [0, -20
]);
130
...
160 />
161 </AbsoluteFill>
162 </Sequence>
163 - <Sequence from={650} layout="none">
163 + <Sequence from={590} layout="none">
164 <SlideInOverlay startAt={0}>
165 <SfxUrlList />
166 </SlideInOverlay>
⏺ Done. Added full-width gray dividers between items, and the overlay now starts
at frame 590 (2 seconds earlier).
❯ in the vercel scene, replace the numbered chapter, and instead play this
video: /Users/jonathanburger/vercel-remotion/out/Tetrahedron.mp4
it should be full height and centered in the slidind overlay
⏺ Bash(cp "/Users/jonathanburger/vercel-remotion/out/Tetrahedron.mp4"
/Users/jonathanburger/whats-new/public/tetrahedron.mp4)
⎿  Done
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene4.tsx)
⎿  Removed 1 line
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 -import { NumberedChapter } from "./NumberedChapter";
5
6 const FILE = "whats4.mov";
7
⏺ Update(src/Scene4.tsx)
⎿  Added 17 lines, removed 2 lines
23 trimAfter={trimAfter}
24 />
25 </AbsoluteFill>
26 - <SlideInOverlay startAt={0.5} holdDuration={2.5}>
27 - <NumberedChapter chapterNumber={3} chapterTitle="Render
- on Vercel" />
26 + <SlideInOverlay startAt={0.5} holdDuration={2.5} backgrou
+ndColor="black">
27 + <AbsoluteFill
28 + style={{
29 + justifyContent: "center",
30 + alignItems: "center",
31 + }}
32 + >
33 + <Video
34 + src={staticFile("tetrahedron.mp4")}
35 + muted
36 + loop
37 + style={{
38 + height: "100%",
39 + objectFit: "contain",
40 + }}
41 + />
42 + </AbsoluteFill>
43 </SlideInOverlay>
44 </AbsoluteFill>
45 );
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Replaced the numbered chapter in Scene4 with the tetrahedron video, full
height, centered, looping, on a black background in the sliding overlay.
✻ Crunched for 38s
❯ we might have to hide the overflow of the sliding overlay
Read 1 file (ctrl+o to expand)
⏺ Update(src/SlideInOverlay.tsx)
⎿  Error editing file
Read 1 file (ctrl+o to expand)
⏺ Update(src/SlideInOverlay.tsx)
⎿  Added 1 line
91 width: `${widthPercent}%`,
92 transform: `translateX(${overlayX}%)`,
93 backgroundColor,
94 + overflow: "hidden",
95 }}
96 >
97 {children}
⏺ Done. Added overflow: "hidden" to the sliding overlay panel.
✻ Worked for 31s
❯ let's not loop the that video, let's play it once and when done, that is the
hold duraiton
⏺ Bash(npx remotion ffprobe -i
/Users/jonathanburger/whats-new/public/tetrahedron.mp4 2>&1 | grep
Duration)
⎿   Duration: 00:00:04.16, start: 0.000000, bitrate: 530 kb/s
⏺ 4.16 seconds. Let me update Scene4 to use that as the hold duration and remove
the loop.
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene4.tsx)
⎿  Added 2 lines, removed 1 line
11 const trimBefore = Math.floor(silence.leadingEnd * fps);
12 const trimAfter = Math.ceil(silence.trailingStart * fps);
13
14 - const overlayProgress = useSlideInProgress({ startAt: 0.5, ho
-ldDuration: 2.5 });
14 + const TETRA_DURATION = 4.16;
15 + const overlayProgress = useSlideInProgress({ startAt: 0.5, ho
+ldDuration: TETRA_DURATION });
16 const videoX = interpolate(overlayProgress, [0, 1], [0, -20])
;
17
18 return (
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line, removed 1 line
24 trimAfter={trimAfter}
25 />
26 </AbsoluteFill>
27 - <SlideInOverlay startAt={0.5} holdDuration={2.5} backgrou
-ndColor="black">
27 + <SlideInOverlay startAt={0.5} holdDuration={TETRA_DURATIO
+N} backgroundColor="black">
28 <AbsoluteFill
29 style={{
30 justifyContent: "center",
⏺ Update(src/Scene4.tsx)
⎿  Removed 1 line
34 <Video
35 src={staticFile("tetrahedron.mp4")}
36 muted
37 - loop
37 style={{
38 height: "100%",
39 objectFit: "contain",
⏺ Update(src/Scene4.tsx)
⎿  Added 2 lines, removed 1 line
12 const trimAfter = Math.ceil(silence.trailingStart * fps);
13
14 const TETRA_DURATION = 4.16;
15 - const overlayProgress = useSlideInProgress({ startAt: 0.5, ho
-ldDuration: TETRA_DURATION });
15 + const SLIDE_OUT = 1;
16 + const overlayProgress = useSlideInProgress({ startAt: 0.5, ho
+ldDuration: TETRA_DURATION - SLIDE_OUT });
17 const videoX = interpolate(overlayProgress, [0, 1], [0, -20])
;
18
19 return (
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line, removed 1 line
25 trimAfter={trimAfter}
26 />
27 </AbsoluteFill>
28 - <SlideInOverlay startAt={0.5} holdDuration={TETRA_DURATIO
-N} backgroundColor="black">
28 + <SlideInOverlay startAt={0.5} holdDuration={TETRA_DURATIO
+N - SLIDE_OUT} backgroundColor="black">
29 <AbsoluteFill
30 style={{
31 justifyContent: "center",
⏺ Done. The tetrahedron plays once (4.16s), and the hold duration is 4.16 - 1 =
3.16s so the slide-out starts as the video ends.
✻ Sautéed for 49s
❯ reduce the hold duraiton by another second.
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line, removed 1 line
13
14 const TETRA_DURATION = 4.16;
15 const SLIDE_OUT = 1;
16 - const overlayProgress = useSlideInProgress({ startAt: 0.5, ho
-ldDuration: TETRA_DURATION - SLIDE_OUT });
16 + const overlayProgress = useSlideInProgress({ startAt: 0.5, ho
+ldDuration: TETRA_DURATION - SLIDE_OUT - 1 });
17 const videoX = interpolate(overlayProgress, [0, 1], [0, -20])
;
18
19 return (
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line, removed 1 line
25 trimAfter={trimAfter}
26 />
27 </AbsoluteFill>
28 - <SlideInOverlay startAt={0.5} holdDuration={TETRA_DURATIO
-N - SLIDE_OUT} backgroundColor="black">
28 + <SlideInOverlay startAt={0.5} holdDuration={TETRA_DURATIO
+N - SLIDE_OUT - 1} backgroundColor="black">
29 <AbsoluteFill
30 style={{
31 justifyContent: "center",
⏺ Done. Hold duration is now ~2.16s.
❯ also import this /Users/jonathanburger/vercel-remotion/out/Tetrahedron.mp4
and let it play as muted from frame 160 on for 3 seconds
⏺ That file is already in public as tetrahedron.mp4. Let me add it as an overlay
in Scene4.
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line, removed 1 line
1 -import { AbsoluteFill, interpolate, staticFile, useVideoConfig }
- from "remotion";
1 +import { AbsoluteFill, Sequence, interpolate, staticFile, useCur
+rentFrame, useVideoConfig } from "remotion";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
⏺ Update(src/Scene4.tsx)
⎿  Added 18 lines
42 />
43 </AbsoluteFill>
44 </SlideInOverlay>
45 + <Sequence from={160} durationInFrames={Math.round(3 * fps
+)} layout="none">
46 + <AbsoluteFill
47 + style={{
48 + backgroundColor: "black",
49 + justifyContent: "center",
50 + alignItems: "center",
51 + }}
52 + >
53 + <Video
54 + src={staticFile("tetrahedron.mp4")}
55 + muted
56 + style={{
57 + height: "100%",
58 + objectFit: "contain",
59 + }}
60 + />
61 + </AbsoluteFill>
62 + </Sequence>
63 </AbsoluteFill>
64 );
65 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  Error: Exit code 2
src/Scene4.tsx(1,59): error TS6133: 'useCurrentFrame' is declared but its
value is never read.
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line, removed 1 line
1 -import { AbsoluteFill, Sequence, interpolate, staticFile, useCur
-rentFrame, useVideoConfig } from "remotion";
1 +import { AbsoluteFill, Sequence, interpolate, staticFile, useVid
+eoConfig } from "remotion";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Added the tetrahedron video as a fullscreen overlay starting at frame
160, playing muted for 3 seconds on a black background.
✻ Crunched for 49s
❯ oops, I referenced the wrong
video'/Users/jonathanburger/Downloads/remotion-on-vercel.mp4'
⏺ Bash(cp "/Users/jonathanburger/Downloads/remotion-on-vercel.mp4"
/Users/jonathanburger/whats-new/public/remotion-on-vercel.mp4)
⎿  Done
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene4.tsx)
⎿  Added 2 lines, removed 2 lines
33 }}
34 >
35 <Video
36 - src={staticFile("tetrahedron.mp4")}
36 + src={staticFile("remotion-on-vercel.mp4")}
37 muted
38 style={{
39 height: "100%",
...
51 }}
52 >
53 <Video
54 - src={staticFile("tetrahedron.mp4")}
54 + src={staticFile("remotion-on-vercel.mp4")}
55 muted
56 style={{
57 height: "100%",
⏺ Bash(npx remotion ffprobe -i
/Users/jonathanburger/whats-new/public/remotion-on-vercel.mp4 2>&1 | grep
Duration)
⎿   Duration: 00:02:19.86, start: 0.000000, bitrate: 5334 kb/s
⎿  Interrupted · What should Claude do instead?
❯ wait. in the slide in overlay, use Tetrahedron.
then for the b roll remotion-on-vercel
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line, removed 1 line
33 }}
34 >
35 <Video
36 - src={staticFile("remotion-on-vercel.mp4")}
36 + src={staticFile("tetrahedron.mp4")}
37 muted
38 style={{
39 height: "100%",
⏺ Done. Slide-in overlay uses tetrahedron.mp4, b-roll at frame 160 uses
remotion-on-vercel.mp4.
❯ then import this image and do the same b roll effect as in scene3 with
sfc-screenshot.png.
componentize it to share logic. then from frame 368 in Scene4, play that b roll
we just created
⎿  [Image #2]
⏺ Bash(cp "/var/folders/x7/t81fj1590_q76dxgzwm5pjhc0000gn/T/TemporaryItems/NSIRD
_screencaptureui_GaXyH9/Screenshot 2026-03-19 at 12.21.40.png"
/Users/jonathanburger/wh…)
⎿  Done
⏺ Now let me extract the Ken Burns image overlay into a shared component, then
use it in both Scene3 and Scene4.
⏺ Write(src/ImageBRoll.tsx)
⎿  Wrote 68 lines to src/ImageBRoll.tsx
1 import {
2 AbsoluteFill,
3 Img,
4 interpolate,
5 staticFile,
6 useCurrentFrame,
7 useVideoConfig,
8 } from "remotion";
9
10 type ImageBRollProps = {
… +58 lines (ctrl+o to expand)
⏺ Now update Scene3 to use the shared component:
Read 1 file (ctrl+o to expand)
⏺ Now replace Scene3's inline image overlay with the component:
⏺ Update(src/Scene3.tsx)
⎿  Added 1 line, removed 1 line
1 import {
2 AbsoluteFill,
3 - Img,
3 Sequence,
4 interpolate,
5 staticFile,
6 useCurrentFrame,
7 useVideoConfig,
8 } from "remotion";
9 +import { ImageBRoll } from "./ImageBRoll";
10 import { Video } from "@remotion/media";
11 import { SILENCES } from "./Composition";
12 import { SlideInOverlay, useSlideInProgress } from "./SlideInOv
erlay";
⏺ Update(src/Scene3.tsx)
⎿  Removed 21 lines
101 const trimBefore = Math.floor(silence.leadingEnd * fps);
102 const trimAfter = Math.ceil(silence.trailingStart * fps);
103
104 - // Screenshot overlay starting at frame 440
105 - const ssStart = 440;
106 - const ssDuration = Math.round(4 * fps);
107 - const ssFade = 0.2 * fps;
108 - const localFrame = frame - ssStart;
109 -
110 - const ssOpacity = interpolate(
111 - localFrame,
112 - [0, ssFade, ssDuration - ssFade, ssDuration],
113 - [0, 1, 1, 0],
114 - { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
115 - );
116 -
117 - const ssScale = 1.15;
118 - const ssTranslateY = interpolate(
119 - localFrame,
120 - [0, ssDuration],
121 - [0, -15],
122 - { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
123 - );
124 -
104 // Combine progress from both overlays to shift background
105 const overlay1Progress = useSlideInProgress({ startAt: 0.5 }
);
106 const overlay2Progress = useSlideInProgress({ startAt: 590 /
fps, slideInDuration: 1, holdDuration: 3.5, slideOutDuration:
1 });
⏺ Update(src/Scene3.tsx)
⎿  Added 2 lines, removed 19 lines
119 <SlideInOverlay startAt={0.5}>
120 <NumberedChapter chapterNumber={2} chapterTitle="Sound
Effects" />
121 </SlideInOverlay>
122 - <Sequence from={ssStart} durationInFrames={ssDuration} l
-ayout="none">
123 - <AbsoluteFill
124 - style={{
125 - backgroundColor: "white",
126 - justifyContent: "center",
127 - alignItems: "center",
128 - opacity: ssOpacity,
129 - }}
130 - >
131 - <Img
132 - src={staticFile("sfx-screenshot.png")}
133 - style={{
134 - height: "100%",
135 - objectFit: "contain",
136 - transformOrigin: "top center",
137 - transform: `scale(${ssScale}) translateY(${ssTra
-nslateY}%)`,
138 - }}
139 - />
140 - </AbsoluteFill>
122 + <Sequence from={440} durationInFrames={Math.round(4 * fp
+s)} layout="none">
123 + <ImageBRoll src="sfx-screenshot.png" />
124 </Sequence>
125 <Sequence from={590} layout="none">
126 <SlideInOverlay startAt={0}>
⏺ Now add the image b-roll to Scene4:
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 +import { ImageBRoll } from "./ImageBRoll";
6
7 const FILE = "whats4.mov";
8
⏺ Update(src/Scene4.tsx)
⎿  Added 3 lines
61 />
62 </AbsoluteFill>
63 </Sequence>
64 + <Sequence from={368} durationInFrames={Math.round(4 * fps
+)} layout="none">
65 + <ImageBRoll src="vercel-screenshot.png" />
66 + </Sequence>
67 </AbsoluteFill>
68 );
69 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  Error: Exit code 2
src/Scene3.tsx(98,9): error TS6133: 'frame' is declared but its value is
never read.
⏺ Update(src/Scene3.tsx)
⎿  Error editing file
⏺ Update(src/Scene3.tsx)
⎿  Removed 1 line
95 };
96
97 export const Scene3: React.FC = () => {
98 - const frame = useCurrentFrame();
98 const { fps } = useVideoConfig();
99 const silence = SILENCES[FILE];
100 const trimBefore = Math.floor(silence.leadingEnd * fps);
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created ImageBRoll component with Ken Burns effect (zoom + pan, fade
in/out), used it in both Scene3 (sfx-screenshot.png at frame 440) and Scene4
(vercel-screenshot.png at frame 368).
✻ Churned for 1m 37s
❯ oops, it is scrolling down too much, I left too much whitespace in teh
screenshot
in this b roll specifically, only scroll down a little bit.
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line, removed 1 line
62 </AbsoluteFill>
63 </Sequence>
64 <Sequence from={368} durationInFrames={Math.round(4 * fps
)} layout="none">
65 - <ImageBRoll src="vercel-screenshot.png" />
65 + <ImageBRoll src="vercel-screenshot.png" panY={-4} />
66 </Sequence>
67 </AbsoluteFill>
68 );
⏺ Done. Pan reduced to -4% for this screenshot.
❯ in the light leaks scene, we had another type of b roll, with a video. let's
compoentize that and on frame 615 in the vercel scene,
'/Users/jonathanburger/Desktop/Screen Recording 2026-03-19 at 12.24.18.mov' is
the broll to show for 4 seconds.
⏺ Bash(cp "/Users/jonathanburger/Desktop/Screen Recording 2026-03-19 at
12.24.18.mov"
/Users/jonathanburger/whats-new/public/vercel-screen-recording.mov)
⎿  Done
⏺ Now let me extract the video b-roll from Scene2 into a shared component:
⏺ Write(src/VideoBRoll.tsx)
⎿  Wrote 69 lines to src/VideoBRoll.tsx
1 import {
2 AbsoluteFill,
3 interpolate,
4 staticFile,
5 useCurrentFrame,
6 useVideoConfig,
7 } from "remotion";
8 import { Video } from "@remotion/media";
9
10 type VideoBRollProps = {
… +59 lines (ctrl+o to expand)
⏺ Now update Scene2 to use it:
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line
10 import { SILENCES } from "./Composition";
11 import { LightLeakGrid } from "./LightLeakGrid";
12 import { SlideInOverlay, useSlideInProgress } from "./SlideInOv
erlay";
13 +import { VideoBRoll } from "./VideoBRoll";
14 import { NumberedChapter } from "./NumberedChapter";
15 import { Prompt } from "./Prompt";
16
⏺ Update(src/Scene2.tsx)
⎿  Added 1 line, removed 36 lines
50 <NumberedChapter chapterNumber={1} chapterTitle="Light
Leaks" />
51 </SlideInOverlay>
52 <Sequence from={540} durationInFrames={Math.round(3 * fps
)} layout="none">
53 - {(() => {
54 - const srDuration = Math.round(3 * fps);
55 - const srFade = 0.2 * fps;
56 - const localFrame = frame - 540;
57 - const srOpacity = interpolate(
58 - localFrame,
59 - [0, srFade, srDuration - srFade, srDuration],
60 - [0, 1, 1, 0],
61 - { extrapolateLeft: "clamp", extrapolateRight: "clam
-p" },
62 - );
63 - const srScale = interpolate(localFrame, [0, srDuratio
-n], [1, 1.05], {
64 - extrapolateLeft: "clamp",
65 - extrapolateRight: "clamp",
66 - });
67 - return (
68 - <AbsoluteFill
69 - style={{
70 - backgroundColor: "white",
71 - justifyContent: "center",
72 - alignItems: "center",
73 - opacity: srOpacity,
74 - }}
75 - >
76 - <Video
77 - src={staticFile("screen-recording.mov")}
78 - muted
79 - style={{
80 - height: "100%",
81 - objectFit: "contain",
82 - transformOrigin: "top center",
83 - transform: `scale(${srScale})`,
84 - }}
85 - />
86 - </AbsoluteFill>
87 - );
88 - })()}
53 + <VideoBRoll src="screen-recording.mov" />
54 </Sequence>
55 <Sequence from={655} durationInFrames={Math.round(3.7 * f
ps)} layout="none">
56 {(() => {
⏺ Now add the video b-roll to Scene4:
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 import { ImageBRoll } from "./ImageBRoll";
6 +import { VideoBRoll } from "./VideoBRoll";
7
8 const FILE = "whats4.mov";
9
⏺ Update(src/Scene4.tsx)
⎿  Added 3 lines
65 <Sequence from={368} durationInFrames={Math.round(4 * fps
)} layout="none">
66 <ImageBRoll src="vercel-screenshot.png" panY={-4} />
67 </Sequence>
68 + <Sequence from={615} durationInFrames={Math.round(4 * fps
+)} layout="none">
69 + <VideoBRoll src="vercel-screen-recording.mov" durationS
+econds={4} />
70 + </Sequence>
71 </AbsoluteFill>
72 );
73 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created VideoBRoll component (fade in/out, Ken Burns zoom, muted),
refactored Scene2 to use it, and added the vercel screen recording at frame
615 in Scene4 for 4 seconds.
✻ Crunched for 53s
❯ the vercel-screenshot.png should also rather have this ken burns effect
rather than the scrolling one.
leave the other imagebroll, if you need to you can make 2 separate compoentns
⏺ The ImageBRoll already does a Ken Burns zoom + pan. The issue is that
vercel-screenshot.png is panning too much. Let me just set panY={0} so it only
zooms without scrolling:
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line, removed 1 line
63 </AbsoluteFill>
64 </Sequence>
65 <Sequence from={368} durationInFrames={Math.round(4 * fps
)} layout="none">
66 - <ImageBRoll src="vercel-screenshot.png" panY={-4} />
66 + <ImageBRoll src="vercel-screenshot.png" panY={0} scale=
+{1.08} />
67 </Sequence>
68 <Sequence from={615} durationInFrames={Math.round(4 * fps
)} layout="none">
69 <VideoBRoll src="vercel-screen-recording.mov" durationS
econds={4} />
⏺ Done. Now it just does a subtle 1.08x zoom with no vertical panning.
❯ take the example snippet from
https://www.remotion.dev/docs/vercel/render-media-on-vercel and put it in a
CodeTransition snippet.
then play it as b roll on frame 920 in the scene. with fade in and out effect
⏺ Fetch(https://www.remotion.dev/docs/vercel/render-media-on-vercel)
⎿  Received 5.1KB (200 OK)
Read 1 file (ctrl+o to expand)
⏺ Now I need a wrapper component that renders the CodeTransition with the
snippet and handles fade in/out. Let me read the CodeTransitionDemo for
reference on how to set up the highlighted code:
Read 1 file (ctrl+o to expand)
⏺ I'll create a reusable CodeBRoll component, then use it in Scene4:
⏺ Write(src/CodeBRoll.tsx)
⎿  Wrote 77 lines to src/CodeBRoll.tsx
1 import {
2 AbsoluteFill,
3 interpolate,
4 useCurrentFrame,
5 useVideoConfig,
6 } from "remotion";
7 import { highlight } from "codehike/code";
8 import { CodeTransition } from "./CodeTransition";
9 import { ThemeProvider, ThemeColors } from "./calculate-metadata
/theme";
10 import { getThemeColors } from "@code-hike/lighter";
… +67 lines (ctrl+o to expand)
⏺ Now add it to Scene4:
⏺ Update(src/Scene4.tsx)
⎿  Added 26 lines
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOv
erlay";
5 import { ImageBRoll } from "./ImageBRoll";
6 import { VideoBRoll } from "./VideoBRoll";
7 +import { CodeBRoll } from "./CodeBRoll";
8
9 +const VERCEL_CODE = `
10 +import {
11 + renderMediaOnVercel,
12 + createSandbox,
13 +} from '@remotion/vercel';
14 +
15 +const sandbox = await createSandbox();
16 +
17 +const {sandboxFilePath} = await renderMediaOnVercel({
18 + sandbox,
19 + compositionId: 'MyComp',
20 + inputProps: {title: 'Hello World'},
21 + onProgress: async (update) => {
22 + console.log(
23 + \`Overall: \${Math.round(update.overallProgress * 100)}%\
+`
24 + );
25 + if (update.stage === 'render-progress') {
26 + console.log(
27 + \`Rendering: \${Math.round(update.progress.progress * 1
+00)}%\`
28 + );
29 + }
30 + },
31 +});
32 +`.trim();
33 +
34 const FILE = "whats4.mov";
35
36 export const Scene4: React.FC = () => {
⏺ Update(src/Scene4.tsx)
⎿  Added 8 lines
94 <Sequence from={615} durationInFrames={Math.round(4 * fp
s)} layout="none">
95 <VideoBRoll src="vercel-screen-recording.mov" duration
Seconds={4} />
96 </Sequence>
97 + <Sequence from={920} durationInFrames={Math.round(4 * fp
+s)} layout="none">
98 + <CodeBRoll
99 + code={VERCEL_CODE}
100 + lang="ts"
101 + durationSeconds={4}
102 + topExplainer="renderMediaOnVercel()"
103 + />
104 + </Sequence>
105 </AbsoluteFill>
106 );
107 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created CodeBRoll component with fade in/out, and added it at frame 920
in Scene4 showing the renderMediaOnVercel() snippet with a
"renderMediaOnVercel()" top explainer, for 4 seconds.
✻ Crunched for 56s
❯ in the "New Skills" scene, from 185, let's add a new slide overlay, starting
from frame 185.
let's make it a list, with the title being "New Skills"
the list items:
- Voicovers with ElevenLabs (from frame 271 in teh scene),
- FFmpeg tasks (from frame 330)
- Audio visualization (from frame 420)
- Exporting transparent videos (from frame 520)
make the title and the list items each take up one fifth of the vertical space
and add a small divider inbetween.
Read 1 file (ctrl+o to expand)
⏺ Write(src/Scene5.tsx)
⎿  Added 90 lines, removed 2 lines
1 -import { AbsoluteFill, interpolate, staticFile, useVideoConfig
-} from "remotion";
1 +import {
2 + AbsoluteFill,
3 + Sequence,
4 + interpolate,
5 + spring,
6 + staticFile,
7 + useCurrentFrame,
8 + useVideoConfig,
9 +} from "remotion";
10 import { Video } from "@remotion/media";
11 import { SILENCES } from "./Composition";
12 import { SlideInOverlay, useSlideInProgress } from "./SlideInOv
erlay";
...
14
15 const FILE = "whats5.mov";
16
17 +const SKILLS_LIST = [
18 + { label: "Voiceovers with ElevenLabs", appearFrame: 271 - 185
+ },
19 + { label: "FFmpeg tasks", appearFrame: 330 - 185 },
20 + { label: "Audio visualization", appearFrame: 420 - 185 },
21 + { label: "Exporting transparent videos", appearFrame: 520 - 1
+85 },
22 +];
23 +
24 +const SkillsList: React.FC = () => {
25 + const frame = useCurrentFrame();
26 + const { fps } = useVideoConfig();
27 +
28 + return (
29 + <AbsoluteFill
30 + style={{
31 + backgroundColor: "white",
32 + flexDirection: "column",
33 + display: "flex",
34 + padding: "0 40px",
35 + }}
36 + >
37 + {/* Title */}
38 + <div
39 + style={{
40 + flex: 1,
41 + display: "flex",
42 + alignItems: "center",
43 + justifyContent: "center",
44 + fontFamily: "GT Planar",
45 + fontSize: 42,
46 + fontWeight: 700,
47 + color: "#111",
48 + borderBottom: "1px solid #e0e0e0",
49 + }}
50 + >
51 + New Skills
52 + </div>
53 + {/* List items */}
54 + {SKILLS_LIST.map((skill, i) => {
55 + const progress = spring({
56 + frame: frame - skill.appearFrame,
57 + fps,
58 + config: { damping: 200 },
59 + durationInFrames: 12,
60 + });
61 + const opacity = progress;
62 + const translateY = interpolate(progress, [0, 1], [20, 0
+]);
63 +
64 + return (
65 + <div
66 + key={i}
67 + style={{
68 + flex: 1,
69 + display: "flex",
70 + alignItems: "center",
71 + fontFamily: "GT Planar",
72 + fontSize: 34,
73 + fontWeight: 500,
74 + color: "#333",
75 + opacity,
76 + transform: `translateY(${translateY}px)`,
77 + borderBottom:
78 + i < SKILLS_LIST.length - 1 ? "1px solid #e0e0e0
+" : "none",
79 + paddingLeft: 20,
80 + }}
81 + >
82 + {skill.label}
83 + </div>
84 + );
85 + })}
86 + </AbsoluteFill>
87 + );
88 +};
89 +
90 export const Scene5: React.FC = () => {
91 const { fps } = useVideoConfig();
92 const silence = SILENCES[FILE];
...
94 const trimAfter = Math.ceil(silence.trailingStart * fps);
95
96 const overlayProgress = useSlideInProgress({ startAt: 0.5, h
oldDuration: 2.5 });
16 - const videoX = interpolate(overlayProgress, [0, 1], [0, -20]
-);
97 + const overlay2Progress = useSlideInProgress({ startAt: 185 /
+ fps });
98 + const combinedProgress = Math.max(overlayProgress, overlay2P
+rogress);
99 + const videoX = interpolate(combinedProgress, [0, 1], [0, -20
+]);
100
101 return (
102 <AbsoluteFill>
...
110 <SlideInOverlay startAt={0.5} holdDuration={2.5}>
111 <NumberedChapter chapterNumber={4} chapterTitle="New S
kills" />
112 </SlideInOverlay>
113 + <Sequence from={185} layout="none">
114 + <SlideInOverlay startAt={0}>
115 + <SkillsList />
116 + </SlideInOverlay>
117 + </Sequence>
118 </AbsoluteFill>
119 );
120 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Added a slide-in overlay at frame 185 in Scene5 with:
- "New Skills" title taking 1/5 of vertical space
- 4 list items each taking 1/5, appearing with a spring animation at their
respective frames (271, 330, 420, 520 — offset relative to the Sequence start)
- Subtle dividers between each section
- Background shift combines both overlays via Math.max()
✻ Worked for 31s
❯ the codesnippet for renderMediaOnVercel should just show the
renderMediaOnVercel() invocation. nothing else, also no onProgress.
⏺ Update(src/Scene4.tsx)
⎿  Added 2 lines, removed 19 lines
7 import { CodeBRoll } from "./CodeBRoll";
8
9 const VERCEL_CODE = `
10 -import {
11 - renderMediaOnVercel,
12 - createSandbox,
13 -} from '@remotion/vercel';
14 -
15 -const sandbox = await createSandbox();
16 -
17 -const {sandboxFilePath} = await renderMediaOnVercel({
10 +const { sandboxFilePath } = await renderMediaOnVercel({
11 sandbox,
12 compositionId: 'MyComp',
20 - inputProps: {title: 'Hello World'},
21 - onProgress: async (update) => {
22 - console.log(
23 - \`Overall: \${Math.round(update.overallProgress * 100)}%\
-`
24 - );
25 - if (update.stage === 'render-progress') {
26 - console.log(
27 - \`Rendering: \${Math.round(update.progress.progress * 1
-00)}%\`
28 - );
29 - }
30 - },
13 + inputProps: { title: 'Hello World' },
14 });
15 `.trim();
16
⏺ Done. Trimmed down to just the renderMediaOnVercel() call.
❯ in the new skills sectiom, let's combine the 2 overlays into one and fade
between them.
keep the timing.
the hold duration of the second overlay was too short. it should only disappear
when the scene is about to finish
Read 1 file (ctrl+o to expand)
⏺ I need to know the scene duration to make the second content last until the
end. Let me check:
Searched for 1 pattern (ctrl+o to expand)
⏺ Scene is ~22.27s (25.31 - 3.04). The overlay starts at 0.5s, so the single
overlay needs to hold for the rest of the scene. I'll combine both into one
overlay that cross-fades from the NumberedChapter to the SkillsList.
⏺ Write(src/Scene5.tsx)
⎿  Added 86 lines, removed 68 lines
15 const FILE = "whats5.mov";
16
17 const SKILLS_LIST = [
18 - { label: "Voiceovers with ElevenLabs", appearFrame: 271 - 18
-5 },
19 - { label: "FFmpeg tasks", appearFrame: 330 - 185 },
20 - { label: "Audio visualization", appearFrame: 420 - 185 },
21 - { label: "Exporting transparent videos", appearFrame: 520 -
-185 },
18 + { label: "Voiceovers with ElevenLabs", appearFrame: 271 },
19 + { label: "FFmpeg tasks", appearFrame: 330 },
20 + { label: "Audio visualization", appearFrame: 420 },
21 + { label: "Exporting transparent videos", appearFrame: 520 },
22 ];
23
24 -const SkillsList: React.FC = () => {
24 +const CROSSFADE_START = 185;
25 +const CROSSFADE_DURATION = 15; // frames
26 +
27 +const OverlayContent: React.FC = () => {
28 const frame = useCurrentFrame();
29 const { fps } = useVideoConfig();
30
31 + // Cross-fade: NumberedChapter fades out, SkillsList fades i
+n
32 + const listOpacity = interpolate(
33 + frame,
34 + [CROSSFADE_START, CROSSFADE_START + CROSSFADE_DURATION],
35 + [0, 1],
36 + { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
37 + );
38 + const chapterOpacity = 1 - listOpacity;
39 +
40 return (
29 - <AbsoluteFill
30 - style={{
31 - backgroundColor: "white",
32 - flexDirection: "column",
33 - display: "flex",
34 - padding: "0 40px",
35 - }}
36 - >
37 - {/* Title */}
38 - <div
41 + <AbsoluteFill style={{ backgroundColor: "white" }}>
42 + {/* NumberedChapter */}
43 + <AbsoluteFill style={{ opacity: chapterOpacity }}>
44 + <NumberedChapter chapterNumber={4} chapterTitle="New S
+kills" />
45 + </AbsoluteFill>
46 + {/* SkillsList */}
47 + <AbsoluteFill
48 style={{
40 - flex: 1,
49 + opacity: listOpacity,
50 + flexDirection: "column",
51 display: "flex",
42 - alignItems: "center",
43 - justifyContent: "center",
44 - fontFamily: "GT Planar",
45 - fontSize: 42,
46 - fontWeight: 700,
47 - color: "#111",
48 - borderBottom: "1px solid #e0e0e0",
52 + padding: "0 40px",
53 }}
54 >
51 - New Skills
52 - </div>
53 - {/* List items */}
54 - {SKILLS_LIST.map((skill, i) => {
55 - const progress = spring({
56 - frame: frame - skill.appearFrame,
57 - fps,
58 - config: { damping: 200 },
59 - durationInFrames: 12,
60 - });
61 - const opacity = progress;
62 - const translateY = interpolate(progress, [0, 1], [20,
-0]);
55 + {/* Title */}
56 + <div
57 + style={{
58 + flex: 1,
59 + display: "flex",
60 + alignItems: "center",
61 + justifyContent: "center",
62 + fontFamily: "GT Planar",
63 + fontSize: 42,
64 + fontWeight: 700,
65 + color: "#111",
66 + borderBottom: "1px solid #e0e0e0",
67 + }}
68 + >
69 + New Skills
70 + </div>
71 + {/* List items */}
72 + {SKILLS_LIST.map((skill, i) => {
73 + const progress = spring({
74 + frame: frame - skill.appearFrame,
75 + fps,
76 + config: { damping: 200 },
77 + durationInFrames: 12,
78 + });
79 + const translateY = interpolate(progress, [0, 1], [20
+, 0]);
80
64 - return (
65 - <div
66 - key={i}
67 - style={{
68 - flex: 1,
69 - display: "flex",
70 - alignItems: "center",
71 - fontFamily: "GT Planar",
72 - fontSize: 34,
73 - fontWeight: 500,
74 - color: "#333",
75 - opacity,
76 - transform: `translateY(${translateY}px)`,
77 - borderBottom:
78 - i < SKILLS_LIST.length - 1 ? "1px solid #e0e0e
-0" : "none",
79 - paddingLeft: 20,
80 - }}
81 - >
82 - {skill.label}
83 - </div>
84 - );
85 - })}
81 + return (
82 + <div
83 + key={i}
84 + style={{
85 + flex: 1,
86 + display: "flex",
87 + alignItems: "center",
88 + fontFamily: "GT Planar",
89 + fontSize: 34,
90 + fontWeight: 500,
91 + color: "#333",
92 + opacity: progress,
93 + transform: `translateY(${translateY}px)`,
94 + borderBottom:
95 + i < SKILLS_LIST.length - 1 ? "1px solid #e0e
+0e0" : "none",
96 + paddingLeft: 20,
97 + }}
98 + >
99 + {skill.label}
100 + </div>
101 + );
102 + })}
103 + </AbsoluteFill>
104 </AbsoluteFill>
105 );
106 };
...
110 const silence = SILENCES[FILE];
111 const trimBefore = Math.floor(silence.leadingEnd * fps);
112 const trimAfter = Math.ceil(silence.trailingStart * fps);
113 + const sceneDuration = (silence.trailingStart - silence.leadi
+ngEnd);
114
96 - const overlayProgress = useSlideInProgress({ startAt: 0.5, h
-oldDuration: 2.5 });
97 - const overlay2Progress = useSlideInProgress({ startAt: 185 /
- fps });
98 - const combinedProgress = Math.max(overlayProgress, overlay2P
-rogress);
99 - const videoX = interpolate(combinedProgress, [0, 1], [0, -20
-]);
115 + const overlayProgress = useSlideInProgress({
116 + startAt: 0.5,
117 + holdDuration: sceneDuration - 0.5 - 1 - 1,
118 + });
119 + const videoX = interpolate(overlayProgress, [0, 1], [0, -20]
+);
120
121 return (
122 <AbsoluteFill>
...
127 trimAfter={trimAfter}
128 />
129 </AbsoluteFill>
110 - <SlideInOverlay startAt={0.5} holdDuration={2.5}>
111 - <NumberedChapter chapterNumber={4} chapterTitle="New S
-kills" />
130 + <SlideInOverlay
131 + startAt={0.5}
132 + holdDuration={sceneDuration - 0.5 - 1 - 1}
133 + >
134 + <OverlayContent />
135 </SlideInOverlay>
113 - <Sequence from={185} layout="none">
114 - <SlideInOverlay startAt={0}>
115 - <SkillsList />
116 - </SlideInOverlay>
117 - </Sequence>
136 </AbsoluteFill>
137 );
138 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  Error: Exit code 2
src/Scene5.tsx(3,3): error TS6133: 'Sequence' is declared but its value is
never read.
⏺ Update(src/Scene5.tsx)
⎿  Removed 1 line
1 import {
2 AbsoluteFill,
3 - Sequence,
3 interpolate,
4 spring,
5 staticFile,
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Combined into a single SlideInOverlay that:
- Starts at 0.5s, holds until ~1s before scene ends
- Cross-fades from NumberedChapter to SkillsList at frame 185 (over 15 frames)
- List items still appear at their original frames (271, 330, 420, 520) with
spring animations
✻ Churned for 46s
❯ please no cross fade, but fade out and then fade in
⏺ Update(src/Scene5.tsx)
⎿  Added 10 lines, removed 5 lines
20 { label: "Exporting transparent videos", appearFrame: 520 },
21 ];
22
23 -const CROSSFADE_START = 185;
24 -const CROSSFADE_DURATION = 15; // frames
23 +const FADE_START = 185;
24 +const FADE_DURATION = 8; // frames
25
26 const OverlayContent: React.FC = () => {
27 const frame = useCurrentFrame();
28 const { fps } = useVideoConfig();
29
30 - // Cross-fade: NumberedChapter fades out, SkillsList fades in
30 + // Fade out chapter, then fade in list
31 + const chapterOpacity = interpolate(
32 + frame,
33 + [FADE_START, FADE_START + FADE_DURATION],
34 + [1, 0],
35 + { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
36 + );
37 const listOpacity = interpolate(
38 frame,
33 - [CROSSFADE_START, CROSSFADE_START + CROSSFADE_DURATION],
39 + [FADE_START + FADE_DURATION, FADE_START + FADE_DURATION * 2
+],
40 [0, 1],
41 { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
42 );
37 - const chapterOpacity = 1 - listOpacity;
43
44 return (
45 <AbsoluteFill style={{ backgroundColor: "white" }}>
⏺ Done. Chapter fades out over 8 frames, then the skills list fades in over the
next 8 frames.
❯ import the following video as broll for the web renderer scene
'/Users/jonathanburger/Downloads/display1773924623054.mp4'
⏺ Bash(cp "/Users/jonathanburger/Downloads/display1773924623054.mp4"
/Users/jonathanburger/whats-new/public/web-renderer-demo.mp4)
⎿  Done
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene6.tsx)
⎿  Added 1 line, removed 1 line
1 -import { AbsoluteFill, interpolate, staticFile, useVideoConfig }
- from "remotion";
1 +import { AbsoluteFill, Sequence, interpolate, staticFile, useVid
+eoConfig } from "remotion";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
⏺ Update(src/Scene6.tsx)
⎿  Added 1 line
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 import { NumberedChapter } from "./NumberedChapter";
6 +import { VideoBRoll } from "./VideoBRoll";
7
8 const FILE = "whats6.mov";
9
⏺ Update(src/Scene6.tsx)
⎿  Added 3 lines
28 <SlideInOverlay startAt={0.5} holdDuration={2.5}>
29 <NumberedChapter chapterNumber={5} chapterTitle="Web Re
nderer Update" />
30 </SlideInOverlay>
31 + <Sequence from={180} durationInFrames={Math.round(4 * fps
+)} layout="none">
32 + <VideoBRoll src="web-renderer-demo.mp4" durationSeconds
+={4} />
33 + </Sequence>
34 </AbsoluteFill>
35 );
36 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Added web-renderer-demo.mp4 as a video b-roll starting at frame 180 in
Scene6, playing for 4 seconds with fade in/out.
✻ Cooked for 40s
❯ trimBefore the first 2 seconds.
then make it play at 2x speed.
⏺ Update(src/VideoBRoll.tsx)
⎿  Added 4 lines
18 scale?: number;
19 /** Background color. Default: "white" */
20 backgroundColor?: string;
21 + /** Trim start in seconds. Default: 0 */
22 + trimBeforeSeconds?: number;
23 + /** Playback rate. Default: 1 */
24 + playbackRate?: number;
25 };
26
27 export const VideoBRoll: React.FC<VideoBRollProps> = ({
⏺ Update(src/VideoBRoll.tsx)
⎿  Added 2 lines
30 fadeDuration = 0.2,
31 scale = 1.05,
32 backgroundColor = "white",
33 + trimBeforeSeconds = 0,
34 + playbackRate = 1,
35 }) => {
36 const frame = useCurrentFrame();
37 const { fps } = useVideoConfig();
⏺ Update(src/VideoBRoll.tsx)
⎿  Added 2 lines
63 <Video
64 src={staticFile(src)}
65 muted
66 + trimBefore={Math.floor(trimBeforeSeconds * fps)}
67 + playbackRate={playbackRate}
68 style={{
69 height: "100%",
70 objectFit: "contain",
⏺ Now apply it in Scene6:
⏺ Update(src/Scene6.tsx)
⎿  Added 1 line, removed 1 line
29 <NumberedChapter chapterNumber={5} chapterTitle="Web Re
nderer Update" />
30 </SlideInOverlay>
31 <Sequence from={180} durationInFrames={Math.round(4 * fps
)} layout="none">
32 - <VideoBRoll src="web-renderer-demo.mp4" durationSeconds
-={4} />
32 + <VideoBRoll src="web-renderer-demo.mp4" durationSeconds
+={4} trimBeforeSeconds={2} playbackRate={2} />
33 </Sequence>
34 </AbsoluteFill>
35 );
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. The web renderer demo video now trims the first 2 seconds and plays at
2x speed.
✻ Crunched for 35s
❯ actually, this does not need to use the VideoBRoll component. we will do
something custom with them.
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene6.tsx)
⎿  Removed 1 line
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 import { NumberedChapter } from "./NumberedChapter";
6 -import { VideoBRoll } from "./VideoBRoll";
6
7 const FILE = "whats6.mov";
8
⏺ Update(src/Scene6.tsx)
⎿  Added 18 lines, removed 1 line
28 <NumberedChapter chapterNumber={5} chapterTitle="Web Re
nderer Update" />
29 </SlideInOverlay>
30 <Sequence from={180} durationInFrames={Math.round(4 * fps
)} layout="none">
31 - <VideoBRoll src="web-renderer-demo.mp4" durationSeconds
-={4} trimBeforeSeconds={2} playbackRate={2} />
31 + <AbsoluteFill
32 + style={{
33 + backgroundColor: "white",
34 + justifyContent: "center",
35 + alignItems: "center",
36 + }}
37 + >
38 + <Video
39 + src={staticFile("web-renderer-demo.mp4")}
40 + muted
41 + trimBefore={Math.floor(2 * fps)}
42 + playbackRate={2}
43 + style={{
44 + height: "100%",
45 + objectFit: "contain",
46 + }}
47 + />
48 + </AbsoluteFill>
49 </Sequence>
50 </AbsoluteFill>
51 );
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Replaced with inline Video directly — no VideoBRoll wrapper.
❯ put the video in a new component. initially, zoom into 1.5x using a smooth
spring transition.
then, after frame 227, pan from the center to focus on the top right edge
(transform origin for the second posture should also be top right)
Read 1 file (ctrl+o to expand)
⏺ Write(src/WebRendererDemo.tsx)
⎿  Wrote 61 lines to src/WebRendererDemo.tsx
1 import {
2 AbsoluteFill,
3 interpolate,
4 spring,
5 staticFile,
6 useCurrentFrame,
7 useVideoConfig,
8 } from "remotion";
9 import { Video } from "@remotion/media";
… +51 lines (ctrl+o to expand)
⏺ Update(src/Scene6.tsx)
⎿  Added 1 line
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 import { NumberedChapter } from "./NumberedChapter";
6 +import { WebRendererDemo } from "./WebRendererDemo";
7
8 const FILE = "whats6.mov";
9
⏺ Update(src/Scene6.tsx)
⎿  Added 1 line, removed 18 lines
29 <NumberedChapter chapterNumber={5} chapterTitle="Web Re
nderer Update" />
30 </SlideInOverlay>
31 <Sequence from={180} durationInFrames={Math.round(10 * fp
s)} premountFor={30}>
32 - <AbsoluteFill
33 - style={{
34 - backgroundColor: "white",
35 - justifyContent: "center",
36 - alignItems: "center",
37 - }}
38 - >
39 - <Video
40 - src={staticFile("web-renderer-demo.mp4")}
41 - muted
42 - trimBefore={Math.floor(2.5 * fps)}
43 - playbackRate={2}
44 - style={{
45 - height: "100%",
46 - objectFit: "contain",
47 - }}
48 - />
49 - </AbsoluteFill>
32 + <WebRendererDemo />
33 </Sequence>
34 </AbsoluteFill>
35 );
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created WebRendererDemo component that:
- Initially zooms from 1x to 1.5x with a smooth spring (damping: 200, 30
frames)
- At frame 227 (relative to scene), pans from center to top-right by animating
transformOrigin from 50% 50% to 100% 0% with another smooth spring
✻ Worked for 42s
❯ it should be frame 227 relative to the demo, not the scene
⏺ The PAN_START is already relative to the Sequence start — it's 227 - 180 = 47.
But since WebRendererDemo is inside a <Sequence from={180}>,
useCurrentFrame() already starts at 0 from the Sequence. So frame 47 in the
component = frame 227 in the scene.
But if you want it at frame 227 relative to the demo component itself (i.e.
227 frames after the demo starts):
⏺ Update(src/WebRendererDemo.tsx)
⎿  Added 1 line, removed 1 line
8 } from "remotion";
9 import { Video } from "@remotion/media";
10
11 -const PAN_START = 227 - 180; // relative to Sequence start
11 +const PAN_START = 227;
12
13 export const WebRendererDemo: React.FC = () => {
14 const frame = useCurrentFrame();
⏺ Update(src/WebRendererDemo.tsx)
⎿  Added 1 line, removed 1 line
47 <Video
48 src={staticFile("web-renderer-demo.mp4")}
49 muted
50 - trimBefore={Math.floor(2.5 * fps)}
50 + trimBefore={Math.floor(3 * fps)}
51 playbackRate={2}
52 style={{
53 height: "100%",
⏺ Done. Pan starts at frame 227 of the demo, and trimmed an extra 0.5s off the
beginning (now 3s total).
❯ in the last 5 seconds of hte web renderer scene, add another table, like we
have in the skills scene. this time all list items are visible immediatly.
the table is about new CSS properties supported.
we not support:
- border-style
- border-width
- border-color
- box-shadow
- object-fit
- text-shadow
- font-style
- -webkit-text-stroke
- paint-order
- filter
put them in a logical order.
Read 1 file (ctrl+o to expand)
⏺ Scene duration is 31.64 - 2.32 = 29.32s = ~880 frames. Last 5 seconds = from
frame ~730.
⏺ Write(src/Scene6.tsx)
⎿  Added 95 lines, removed 1 line
7
8 const FILE = "whats6.mov";
9
10 +const CSS_PROPERTIES = [
11 + "border-style",
12 + "border-width",
13 + "border-color",
14 + "box-shadow",
15 + "text-shadow",
16 + "font-style",
17 + "object-fit",
18 + "filter",
19 + "paint-order",
20 + "-webkit-text-stroke",
21 +];
22 +
23 +const CssPropertyList: React.FC = () => {
24 + const ITEMS_PER_COLUMN = 5;
25 + const leftColumn = CSS_PROPERTIES.slice(0, ITEMS_PER_COLUMN)
+;
26 + const rightColumn = CSS_PROPERTIES.slice(ITEMS_PER_COLUMN);
27 +
28 + return (
29 + <AbsoluteFill
30 + style={{
31 + backgroundColor: "white",
32 + flexDirection: "column",
33 + display: "flex",
34 + padding: "0 40px",
35 + }}
36 + >
37 + <div
38 + style={{
39 + display: "flex",
40 + alignItems: "center",
41 + justifyContent: "center",
42 + fontFamily: "GT Planar",
43 + fontSize: 36,
44 + fontWeight: 700,
45 + color: "#111",
46 + borderBottom: "1px solid #e0e0e0",
47 + height: 100,
48 + flexShrink: 0,
49 + }}
50 + >
51 + New CSS Properties
52 + </div>
53 + <div
54 + style={{
55 + flex: 1,
56 + display: "flex",
57 + flexDirection: "row",
58 + }}
59 + >
60 + {[leftColumn, rightColumn].map((column, colIdx) => (
61 + <div
62 + key={colIdx}
63 + style={{
64 + flex: 1,
65 + display: "flex",
66 + flexDirection: "column",
67 + borderRight: colIdx === 0 ? "1px solid #e0e0e0"
+: "none",
68 + }}
69 + >
70 + {column.map((prop, i) => (
71 + <div
72 + key={prop}
73 + style={{
74 + flex: 1,
75 + display: "flex",
76 + alignItems: "center",
77 + fontFamily: "monospace",
78 + fontSize: 26,
79 + fontWeight: 500,
80 + color: "#333",
81 + borderBottom: i < column.length - 1 ? "1px s
+olid #e0e0e0" : "none",
82 + paddingLeft: 24,
83 + }}
84 + >
85 + {prop}
86 + </div>
87 + ))}
88 + </div>
89 + ))}
90 + </div>
91 + </AbsoluteFill>
92 + );
93 +};
94 +
95 export const Scene6: React.FC = () => {
96 const { fps } = useVideoConfig();
97 const silence = SILENCES[FILE];
98 const trimBefore = Math.floor(silence.leadingEnd * fps);
99 const trimAfter = Math.ceil(silence.trailingStart * fps);
100 + const sceneDuration = silence.trailingStart - silence.leadin
+gEnd;
101 + const listStartAt = sceneDuration - 5 - 1; // 5s before end,
+ minus 1s for slide-in
102
103 const overlayProgress = useSlideInProgress({ startAt: 0.5, h
oldDuration: 2.5 });
17 - const videoX = interpolate(overlayProgress, [0, 1], [0, -20]
-);
104 + const overlay2Progress = useSlideInProgress({ startAt: listS
+tartAt });
105 + const combinedProgress = Math.max(overlayProgress, overlay2P
+rogress);
106 + const videoX = interpolate(combinedProgress, [0, 1], [0, -20
+]);
107
108 return (
109 <AbsoluteFill>
...
120 <Sequence from={180} durationInFrames={Math.round(10 * f
ps)} premountFor={30}>
121 <WebRendererDemo />
122 </Sequence>
123 + <Sequence from={Math.round(listStartAt * fps)} layout="n
+one">
124 + <SlideInOverlay startAt={0}>
125 + <CssPropertyList />
126 + </SlideInOverlay>
127 + </Sequence>
128 </AbsoluteFill>
129 );
130 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Added a slide-in overlay in the last ~5 seconds of the Web Renderer
scene with a 2-column layout of 10 CSS properties, all visible immediately.
Properties ordered logically: border properties → shadows → typography →
layout → effects.
✻ Worked for 41s
❯ I just want a list, not 2 columns.
font is GT Planar, use an approproate font size so it's but but all items are
shown
⏺ Update(src/Scene6.tsx)
⎿  Added 20 lines, removed 44 lines
21 ];
22
23 const CssPropertyList: React.FC = () => {
24 - const ITEMS_PER_COLUMN = 5;
25 - const leftColumn = CSS_PROPERTIES.slice(0, ITEMS_PER_COLUMN);
26 - const rightColumn = CSS_PROPERTIES.slice(ITEMS_PER_COLUMN);
27 -
24 return (
25 <AbsoluteFill
26 style={{
...
36 alignItems: "center",
37 justifyContent: "center",
38 fontFamily: "GT Planar",
43 - fontSize: 36,
39 + fontSize: 32,
40 fontWeight: 700,
41 color: "#111",
42 borderBottom: "1px solid #e0e0e0",
47 - height: 100,
43 + height: 80,
44 flexShrink: 0,
45 }}
46 >
47 New CSS Properties
48 </div>
53 - <div
54 - style={{
55 - flex: 1,
56 - display: "flex",
57 - flexDirection: "row",
58 - }}
59 - >
60 - {[leftColumn, rightColumn].map((column, colIdx) => (
61 - <div
62 - key={colIdx}
63 - style={{
64 - flex: 1,
65 - display: "flex",
66 - flexDirection: "column",
67 - borderRight: colIdx === 0 ? "1px solid #e0e0e0" :
- "none",
68 - }}
69 - >
70 - {column.map((prop, i) => (
71 - <div
72 - key={prop}
73 - style={{
74 - flex: 1,
75 - display: "flex",
76 - alignItems: "center",
77 - fontFamily: "monospace",
78 - fontSize: 26,
79 - fontWeight: 500,
80 - color: "#333",
81 - borderBottom: i < column.length - 1 ? "1px so
-lid #e0e0e0" : "none",
82 - paddingLeft: 24,
83 - }}
84 - >
85 - {prop}
86 - </div>
87 - ))}
88 - </div>
89 - ))}
90 - </div>
49 + {CSS_PROPERTIES.map((prop, i) => (
50 + <div
51 + key={prop}
52 + style={{
53 + flex: 1,
54 + display: "flex",
55 + alignItems: "center",
56 + fontFamily: "GT Planar",
57 + fontSize: 28,
58 + fontWeight: 500,
59 + color: "#333",
60 + borderBottom: i < CSS_PROPERTIES.length - 1 ? "1px
+solid #e0e0e0" : "none",
61 + paddingLeft: 24,
62 + }}
63 + >
64 + {prop}
65 + </div>
66 + ))}
67 </AbsoluteFill>
68 );
69 };
⏺ Done. Single column list with GT Planar font, 28px for items, all 10
properties visible at once.
✻ Baked for 36s
❯ '/Users/jonathanburger/Desktop/Screen Recording 2026-03-19 at 14.16.07.mov'
add this as a new broll in the "Work better with Agents" scene, appearing after
530 frames for 5 seconds.
the video should only take up 70% of the composition height. background should
be #141414.
ken burns zoom in effect. fade in and fade out.
⏺ Bash(cp "/Users/jonathanburger/Desktop/Screen Recording 2026-03-19 at
14.16.07.mov"
/Users/jonathanburger/whats-new/public/agents-screen-recording.mov)
⎿  Done
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene7.tsx)
⎿  Added 1 line, removed 1 line
1 -import { AbsoluteFill, interpolate, staticFile, useVideoConfig }
- from "remotion";
1 +import { AbsoluteFill, Sequence, interpolate, staticFile, useCur
+rentFrame, useVideoConfig } from "remotion";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
⏺ Update(src/Scene7.tsx)
⎿  Added 3 lines
27 <SlideInOverlay startAt={0.5} holdDuration={2.5}>
28 <NumberedChapter chapterNumber={6} chapterTitle="Work b
etter with Agents" />
29 </SlideInOverlay>
30 + <Sequence from={530} durationInFrames={Math.round(5 * fps
+)} layout="none">
31 + <AgentsBRoll />
32 + </Sequence>
33 </AbsoluteFill>
34 );
35 };
⏺ Now add the AgentsBRoll component in the same file:
⏺ Update(src/Scene7.tsx)
⎿  Added 40 lines
6
7 const FILE = "whats7.mov";
8
9 +const AgentsBRoll: React.FC = () => {
10 + const frame = useCurrentFrame();
11 + const { fps } = useVideoConfig();
12 + const duration = Math.round(5 * fps);
13 + const fade = 0.2 * fps;
14 +
15 + const opacity = interpolate(
16 + frame,
17 + [0, fade, duration - fade, duration],
18 + [0, 1, 1, 0],
19 + { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
20 + );
21 + const scale = interpolate(frame, [0, duration], [1, 1.08], {
22 + extrapolateLeft: "clamp",
23 + extrapolateRight: "clamp",
24 + });
25 +
26 + return (
27 + <AbsoluteFill
28 + style={{
29 + backgroundColor: "#141414",
30 + justifyContent: "center",
31 + alignItems: "center",
32 + opacity,
33 + }}
34 + >
35 + <Video
36 + src={staticFile("agents-screen-recording.mov")}
37 + muted
38 + style={{
39 + height: "70%",
40 + objectFit: "contain",
41 + transformOrigin: "top center",
42 + transform: `scale(${scale})`,
43 + }}
44 + />
45 + </AbsoluteFill>
46 + );
47 +};
48 +
49 export const Scene7: React.FC = () => {
50 const { fps } = useVideoConfig();
51 const silence = SILENCES[FILE];
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Added the agents screen recording at frame 530 in Scene7 for 5 seconds,
70% height on #141414 background, with Ken Burns zoom (1→1.08) and 0.2s fade
in/out.
✻ Cogitated for 44s
❯ make the video play at 2x
⏺ Update(src/Scene7.tsx)
⎿  Added 1 line
35 <Video
36 src={staticFile("agents-screen-recording.mov")}
37 muted
38 + playbackRate={2}
39 style={{
40 height: "70%",
41 objectFit: "contain",
⏺ Done.
❯ in the Rspack scene, add a CodeTransitionDemo. as a starting code, take the
code from remotion.config.ts (without the comments), and as the second code
snippet, add the Rspack flag. https://www.remotion.dev/docs/config
show this as b-roll after 180 frames. use fade in and fade out
Read 1 file (ctrl+o to expand)
⏺ Fetch(https://www.remotion.dev/docs/config)
⎿  Received 35.4KB (200 OK)
Read 1 file (ctrl+o to expand)
⏺ Write(src/Scene8.tsx)
⎿  Added 30 lines, removed 1 line
1 -import { AbsoluteFill, interpolate, staticFile, useVideoConfig
-} from "remotion";
1 +import { AbsoluteFill, Sequence, interpolate, staticFile, useVi
+deoConfig } from "remotion";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOv
erlay";
5 import { NumberedChapter } from "./NumberedChapter";
6 +import { CodeBRoll } from "./CodeBRoll";
7
8 const FILE = "whats8.mov";
9
10 +const CODE_BEFORE = `
11 +import { Config } from "@remotion/cli/config";
12 +import { enableTailwind } from "@remotion/tailwind-v4";
13 +
14 +Config.setVideoImageFormat("jpeg");
15 +Config.setOverwriteOutput(true);
16 +Config.overrideWebpackConfig(enableTailwind);
17 +`.trim();
18 +
19 +const CODE_AFTER = `
20 +import { Config } from "@remotion/cli/config";
21 +import { enableTailwind } from "@remotion/tailwind-v4";
22 +
23 +Config.setVideoImageFormat("jpeg");
24 +Config.setOverwriteOutput(true);
25 +Config.overrideWebpackConfig(enableTailwind);
26 +Config.setExperimentalRspackEnabled(true);
27 +`.trim();
28 +
29 export const Scene8: React.FC = () => {
30 const { fps } = useVideoConfig();
31 const silence = SILENCES[FILE];
...
47 <SlideInOverlay startAt={0.5} holdDuration={2.5}>
48 <NumberedChapter chapterNumber={7} chapterTitle="Rspack
" />
49 </SlideInOverlay>
50 + <Sequence from={180} durationInFrames={Math.round(4 * fps
+)} layout="none">
51 + <CodeBRoll
52 + code={CODE_AFTER}
53 + previousCode={CODE_BEFORE}
54 + lang="ts"
55 + durationSeconds={4}
56 + topExplainer="remotion.config.ts"
57 + />
58 + </Sequence>
59 </AbsoluteFill>
60 );
61 };
⏺ Now I need to update CodeBRoll to support a previousCode prop for the
transition:
Read 1 file (ctrl+o to expand)
⏺ Update(src/CodeBRoll.tsx)
⎿  Added 2 lines
14
15 type CodeBRollProps = {
16 code: string;
17 + /** Previous code for transition animation. Default: none */
18 + previousCode?: string;
19 /** Duration in seconds. Default: 4 */
20 durationSeconds?: number;
21 /** Fade in/out duration in seconds. Default: 0.2 */
⏺ Update(src/CodeBRoll.tsx)
⎿  Added 1 line
28
29 export const CodeBRoll: React.FC<CodeBRollProps> = ({
30 code,
31 + previousCode,
32 durationSeconds = 4,
33 fadeDuration = 0.2,
34 lang = "tsx",
⏺ Update(src/CodeBRoll.tsx)
⎿  Added 16 lines, removed 5 lines
49
50 const [data, setData] = useState<{
51 highlighted: Awaited<ReturnType<typeof highlight>>;
52 + previousHighlighted: Awaited<ReturnType<typeof highlight>>
+| null;
53 themeColors: ThemeColors;
54 } | null>(null);
55
56 useEffect(() => {
56 - Promise.all([
57 + const promises: Promise<unknown>[] = [
58 highlight({ value: code, lang, meta: "" }, THEME),
59 getThemeColors(THEME),
59 - ]).then(([highlighted, themeColors]) => {
60 - setData({ highlighted, themeColors });
60 + ];
61 + if (previousCode) {
62 + promises.push(highlight({ value: previousCode, lang, meta
+: "" }, THEME));
63 + }
64 + Promise.all(promises).then((results) => {
65 + setData({
66 + highlighted: results[0] as Awaited<ReturnType<typeof hi
+ghlight>>,
67 + themeColors: results[1] as ThemeColors,
68 + previousHighlighted: results[2]
69 + ? (results[2] as Awaited<ReturnType<typeof highlight>
+>)
70 + : null,
71 + });
72 });
62 - }, [code, lang]);
73 + }, [code, previousCode, lang]);
74
75 if (!data) return null;
76
...
79 <ThemeProvider themeColors={data.themeColors}>
80 <AbsoluteFill style={{ backgroundColor: data.themeColor
s.background }}>
81 <CodeTransition
71 - previousCode={null}
82 + previousCode={data.previousHighlighted}
83 currentCode={data.highlighted}
84 nextCode={null}
85 topExplainerContent={topExplainer}
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Added a CodeBRoll at frame 180 in Scene8 that transitions from the
current remotion.config.ts to the version with
Config.setExperimentalRspackEnabled(true) added. The CodeBRoll component now
supports an optional previousCode prop for animated code transitions with fade
in/out.
✻ Cooked for 1m 38s
❯ import the following composition into this project:
/Users/jonathanburger/remotion2/packages/brand/src/video-elements/upper-referen
ce/index.tsx
actually, we don't need the github icon. we just want the text.
Read 1 file (ctrl+o to expand)
⏺ Write(src/UpperReference.tsx)
⎿  Wrote 51 lines to src/UpperReference.tsx
1 import React from "react";
2 import {
3 AbsoluteFill,
4 interpolate,
5 spring,
6 useCurrentFrame,
7 useVideoConfig,
8 } from "remotion";
9
10 const PADDING = 70;
… +41 lines (ctrl+o to expand)
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created UpperReference component — a text label that springs in from the
top-left with a slight rotation, white background with box shadow. Takes a
text prop instead of repoName, no GitHub icon.
✻ Worked for 37s
❯ in the vercel scene, from frame 1080, add this UpperReference and make it say
"It's now out on our YouTube channel!"
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene4.tsx)
⎿  Added 1 line
5 import { ImageBRoll } from "./ImageBRoll";
6 import { VideoBRoll } from "./VideoBRoll";
7 import { CodeBRoll } from "./CodeBRoll";
8 +import { UpperReference } from "./UpperReference";
9
10 const VERCEL_CODE = `
11 const { sandboxFilePath } = await renderMediaOnVercel({
⏺ Update(src/Scene4.tsx)
⎿  Added 3 lines
86 topExplainer="renderMediaOnVercel()"
87 />
88 </Sequence>
89 + <Sequence from={1080} layout="none">
90 + <UpperReference text="It's now out on our YouTube chann
+el!" />
91 + </Sequence>
92 </AbsoluteFill>
93 );
94 };
⏺ Done. UpperReference with "It's now out on our YouTube channel!" appears from
frame 1080 in the Vercel scene.
✻ Sautéed for 42s
❯ make it appear already 2 seconds earlier, make it say "A tutorial is out
now...", make the font size much smaller, and reverse the animation to animate
it out, before the scene ends
Read 1 file (ctrl+o to expand)
⏺ I need to add a durationInFrames prop so it knows when to animate out. Let me
update the component:
⏺ Write(src/UpperReference.tsx)
⎿  Added 21 lines, removed 5 lines
11
12 type UpperReferenceProps = {
13 text: string;
14 + fontSize?: number;
15 + durationInFrames?: number;
16 };
17
16 -export const UpperReference: React.FC<UpperReferenceProps> = ({
- text }) => {
18 +export const UpperReference: React.FC<UpperReferenceProps> = ({
19 + text,
20 + fontSize = 70,
21 + durationInFrames,
22 +}) => {
23 const { fps } = useVideoConfig();
24 const frame = useCurrentFrame();
25
...
29 config: { damping: 200 },
30 });
31
32 + const exit = durationInFrames
33 + ? spring({
34 + fps,
35 + frame: frame - durationInFrames + 15,
36 + config: { damping: 200 },
37 + })
38 + : 0;
39 +
40 + const progress = entry - exit;
41 +
42 return (
43 <AbsoluteFill
44 style={{
...
51 style={{
52 backgroundColor: "white",
53 fontFamily: "GT Planar",
38 - padding: "40px 70px",
39 - fontSize: 70,
54 + padding: "24px 44px",
55 + fontSize,
56 top: PADDING,
41 - borderRadius: 25,
57 + borderRadius: 18,
58 boxShadow: "0 0 30px rgba(0, 0, 0, 0.1)",
59 fontWeight: "bolder",
44 - transform: `translateY(${-interpolate(entry, [0, 1],
-[400, 0])}px) rotateZ(${interpolate(entry, [0, 1], [Math.PI * 0
-.05, 0])}rad)`,
60 + transform: `translateY(${-interpolate(progress, [0, 1
+], [400, 0])}px) rotateZ(${interpolate(progress, [0, 1], [Math.
+PI * 0.05, 0])}rad)`,
61 }}
62 >
63 {text}
⏺ Now update Scene4 — the scene duration is 38.77 - 1.5 = 37.27s ≈ 1118 frames.
Starting at frame 1020 (2s earlier than 1080), ending at scene end:
⏺ Update(src/Scene4.tsx)
⎿  Added 6 lines, removed 2 lines
86 topExplainer="renderMediaOnVercel()"
87 />
88 </Sequence>
89 - <Sequence from={1080} layout="none">
90 - <UpperReference text="It's now out on our YouTube chann
-el!" />
89 + <Sequence from={1020} layout="none">
90 + <UpperReference
91 + text="A tutorial is out now..."
92 + fontSize={36}
93 + durationInFrames={Math.ceil((trimAfter - trimBefore)
+- 1020)}
94 + />
95 </Sequence>
96 </AbsoluteFill>
97 );
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. The UpperReference now:
- Appears at frame 1020 (2s earlier)
- Says "A tutorial is out now..."
- Font size is 36px (was 70)
- Animates out with a reversed spring before the scene ends
✻ Baked for 35s
❯ make it appear 20 frames later
⏺ Update(src/Scene4.tsx)
⎿  Added 2 lines, removed 2 lines
86 topExplainer="renderMediaOnVercel()"
87 />
88 </Sequence>
89 - <Sequence from={1020} layout="none">
89 + <Sequence from={1040} layout="none">
90 <UpperReference
91 text="The tutorial is out now out on YouTube!"
92 fontSize={36}
93 - durationInFrames={Math.ceil((trimAfter - trimBefore)
-- 1020)}
93 + durationInFrames={Math.ceil((trimAfter - trimBefore)
+- 1040)}
94 />
95 </Sequence>
96 </AbsoluteFill>
⏺ Done.
❯ in the web renderer progress scene:
- cut off another second off the start of the video
- add another Upper Reference:
Read 1 file (ctrl+o to expand)
⏺ Update(src/WebRendererDemo.tsx)
⎿  Added 1 line, removed 1 line
47 <Video
48 src={staticFile("web-renderer-demo.mp4")}
49 muted
50 - trimBefore={Math.floor(3 * fps)}
50 + trimBefore={Math.floor(4 * fps)}
51 playbackRate={2}
52 style={{
53 height: "100%",
⏺ Now add the UpperReference to Scene6. What text should it say?
❯ "Fun fact: This video was edited with Claude Code and rendered completely
client-side"!
Read 1 file (ctrl+o to expand)
❯ it should appear at around 190 frames into the video
⏺ Update(src/Scene6.tsx)
⎿  Added 1 line
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOv
erlay";
5 import { NumberedChapter } from "./NumberedChapter";
6 import { WebRendererDemo } from "./WebRendererDemo";
7 +import { UpperReference } from "./UpperReference";
8
9 const FILE = "whats6.mov";
10
❯ * into the scene
⏺ Update(src/Scene6.tsx)
⎿  Added 7 lines
97 <Sequence from={180} durationInFrames={Math.round(15 * f
ps)} premountFor={30}>
98 <WebRendererDemo />
99 </Sequence>
100 + <Sequence from={190} layout="none">
101 + <UpperReference
102 + text="Fun fact: This video was edited with Claude Co
+de and rendered completely client-side!"
103 + fontSize={30}
104 + durationInFrames={Math.round(listStartAt * fps) - 19
+0}
105 + />
106 + </Sequence>
107 <Sequence from={Math.round(listStartAt * fps)} layout="n
one">
108 <SlideInOverlay startAt={0}>
109 <CssPropertyList />
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Added the UpperReference at frame 190 in the scene, saying "Fun fact:
This video was edited with Claude Code and rendered completely client-side!"
at 30px font size. It animates out before the CSS properties list overlay
appears.
✻ Churned for 44s
❯ the text should have a maximum width of 500px (allowing for a line break)
and it should stay for 5 seconds
⏺ Update(src/Scene6.tsx)
⎿  Added 2 lines, removed 1 line
101 <UpperReference
102 text="Fun fact: This video was edited with Claude Co
de and rendered completely client-side!"
103 fontSize={30}
104 - durationInFrames={Math.round(listStartAt * fps) - 19
-0}
104 + maxWidth={500}
105 + durationInFrames={Math.round(5 * fps)}
106 />
107 </Sequence>
108 <Sequence from={Math.round(listStartAt * fps)} layout="n
one">
⏺ Now add maxWidth prop to UpperReference:
⏺ Update(src/UpperReference.tsx)
⎿  Added 1 line
12 type UpperReferenceProps = {
13 text: string;
14 fontSize?: number;
15 + maxWidth?: number;
16 durationInFrames?: number;
17 };
18
⏺ Update(src/UpperReference.tsx)
⎿  Added 1 line
19 export const UpperReference: React.FC<UpperReferenceProps> = ({
20 text,
21 fontSize = 70,
22 + maxWidth,
23 durationInFrames,
24 }) => {
25 const { fps } = useVideoConfig();
⏺ Update(src/UpperReference.tsx)
⎿  Added 1 line
59 borderRadius: 18,
60 boxShadow: "0 0 30px rgba(0, 0, 0, 0.1)",
61 fontWeight: "bolder",
62 + maxWidth: maxWidth,
63 transform: `translateY(${-interpolate(progress, [0, 1
], [400, 0])}px) rotateZ(${interpolate(progress, [0, 1], [Math.
PI * 0.05, 0])}rad)`,
64 }}
65 >
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Text now has a max width of 500px (allowing line breaks) and stays for 5
seconds before animating out.
✻ Churned for 44s
❯ import the '/Users/jonathanburger/Documents/GitHub/Facebook-Sound-Kit/Full
Volume -5dB/Errors and Cancel/Cancel 1.m4a' sound effect and when in
src/Scene5.tsx, a new list item appears play the sound.
componentize this list component, we're gonna use it in another scene as well.
⏺ Bash(cp "/Users/jonathanburger/Documents/GitHub/Facebook-Sound-Kit/Full Volume
-5dB/Errors and Cancel/Cancel 1.m4a"
/Users/jonathanburger/whats-new/public/list-item-…)
⎿  Done
Read 1 file (ctrl+o to expand)
⏺ Now I'll extract the animated list into a shared component:
⏺ Write(src/AnimatedList.tsx)
⎿  Wrote 86 lines to src/AnimatedList.tsx
1 import {
2 AbsoluteFill,
3 Sequence,
4 interpolate,
5 spring,
6 staticFile,
7 useCurrentFrame,
8 useVideoConfig,
9 } from "remotion";
10 import { Audio } from "@remotion/media";
… +76 lines (ctrl+o to expand)
⏺ Now update Scene5 to use the shared component:
⏺ Write(src/Scene5.tsx)
⎿  Added 5 lines, removed 63 lines
1 import {
2 AbsoluteFill,
3 interpolate,
4 - spring,
4 staticFile,
5 useCurrentFrame,
6 useVideoConfig,
...
9 import { SILENCES } from "./Composition";
10 import { SlideInOverlay, useSlideInProgress } from "./SlideInOv
erlay";
11 import { NumberedChapter } from "./NumberedChapter";
12 +import { AnimatedList } from "./AnimatedList";
13
14 const FILE = "whats5.mov";
15
...
21 ];
22
23 const FADE_START = 185;
24 -const FADE_DURATION = 8; // frames
24 +const FADE_DURATION = 8;
25
26 const OverlayContent: React.FC = () => {
27 const frame = useCurrentFrame();
28 - const { fps } = useVideoConfig();
28
30 - // Fade out chapter, then fade in list
29 const chapterOpacity = interpolate(
30 frame,
31 [FADE_START, FADE_START + FADE_DURATION],
...
41
42 return (
43 <AbsoluteFill style={{ backgroundColor: "white" }}>
46 - {/* NumberedChapter */}
44 <AbsoluteFill style={{ opacity: chapterOpacity }}>
45 <NumberedChapter chapterNumber={4} chapterTitle="New S
kills" />
46 </AbsoluteFill>
50 - {/* SkillsList */}
51 - <AbsoluteFill
52 - style={{
53 - opacity: listOpacity,
54 - flexDirection: "column",
55 - display: "flex",
56 - padding: "0 40px",
57 - }}
58 - >
59 - {/* Title */}
60 - <div
61 - style={{
62 - flex: 1,
63 - display: "flex",
64 - alignItems: "center",
65 - justifyContent: "center",
66 - fontFamily: "GT Planar",
67 - fontSize: 42,
68 - fontWeight: 700,
69 - color: "#111",
70 - borderBottom: "1px solid #e0e0e0",
71 - }}
72 - >
73 - New Skills
74 - </div>
75 - {/* List items */}
76 - {SKILLS_LIST.map((skill, i) => {
77 - const progress = spring({
78 - frame: frame - skill.appearFrame,
79 - fps,
80 - config: { damping: 200 },
81 - durationInFrames: 12,
82 - });
83 - const translateY = interpolate(progress, [0, 1], [20
-, 0]);
84 -
85 - return (
86 - <div
87 - key={i}
88 - style={{
89 - flex: 1,
90 - display: "flex",
91 - alignItems: "center",
92 - fontFamily: "GT Planar",
93 - fontSize: 34,
94 - fontWeight: 500,
95 - color: "#333",
96 - opacity: progress,
97 - transform: `translateY(${translateY}px)`,
98 - borderBottom:
99 - i < SKILLS_LIST.length - 1 ? "1px solid #e0e
-0e0" : "none",
100 - paddingLeft: 20,
101 - }}
102 - >
103 - {skill.label}
104 - </div>
105 - );
106 - })}
47 + <AbsoluteFill style={{ opacity: listOpacity }}>
48 + <AnimatedList title="New Skills" items={SKILLS_LIST} /
+>
49 </AbsoluteFill>
50 </AbsoluteFill>
51 );
...
56 const silence = SILENCES[FILE];
57 const trimBefore = Math.floor(silence.leadingEnd * fps);
58 const trimAfter = Math.ceil(silence.trailingStart * fps);
117 - const sceneDuration = (silence.trailingStart - silence.leadi
-ngEnd);
59 + const sceneDuration = silence.trailingStart - silence.leadin
+gEnd;
60
61 const overlayProgress = useSlideInProgress({
62 startAt: 0.5,
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created AnimatedList component that:
- Takes title and items (each with label and appearFrame)
- Each item springs in with a sound effect (list-item-sfx.m4a at volume 0.15)
- Reusable across scenes
Scene5 now uses AnimatedList inside its overlay content.
✻ Worked for 59s
❯ in the work better with agents scene, we add this component again, from frame
700.
title: Agentic flow
the first list item (already visible from the beginning, no sound effect):
- Single Studio Server
then new items coming in:
- frame 740: No multiple lockfile warning
- frame 940: Zod 4 supported
frame 970 - the overlay is done, animate it out.
Read 1 file (ctrl+o to expand)
⏺ The AnimatedList currently always plays a sound effect. I need to support
items that are visible from the start (no animation, no sound). Let me update
AnimatedList to support appearFrame: 0 meaning already visible:
Read 1 file (ctrl+o to expand)
⏺ Update(src/AnimatedList.tsx)
⎿  Added 2 lines, removed 1 line
9 } from "remotion";
10 import { Audio } from "@remotion/media";
11
12 -type ListItem = {
12 +export type ListItem = {
13 label: string;
14 + /** Frame at which item appears. Use -1 for immediately visib
+le (no animation, no sound). */
15 appearFrame: number;
16 };
17
⏺ Update(src/AnimatedList.tsx)
⎿  Added 15 lines, removed 10 lines
49 {title}
50 </div>
51 {items.map((item, i) => {
52 - const progress = spring({
53 - frame: frame - item.appearFrame,
54 - fps,
55 - config: { damping: 200 },
56 - durationInFrames: 12,
57 - });
58 - const translateY = interpolate(progress, [0, 1], [20, 0
-]);
52 + const isImmediate = item.appearFrame < 0;
53 + const progress = isImmediate
54 + ? 1
55 + : spring({
56 + frame: frame - item.appearFrame,
57 + fps,
58 + config: { damping: 200 },
59 + durationInFrames: 12,
60 + });
61 + const translateY = isImmediate ? 0 : interpolate(progre
+ss, [0, 1], [20, 0]);
62
63 return (
64 <div
...
78 paddingLeft: 20,
79 }}
80 >
78 - <Sequence from={item.appearFrame} layout="none">
79 - <Audio src={staticFile("list-item-sfx.m4a")} volu
-me={0.15} />
80 - </Sequence>
81 + {!isImmediate && (
82 + <Sequence from={item.appearFrame} layout="none">
83 + <Audio src={staticFile("list-item-sfx.m4a")} vo
+lume={0.15} />
84 + </Sequence>
85 + )}
86 {item.label}
87 </div>
88 );
⏺ Now update Scene7:
⏺ Update(src/Scene7.tsx)
⎿  Added 1 line
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 import { NumberedChapter } from "./NumberedChapter";
6 +import { AnimatedList } from "./AnimatedList";
7
8 const FILE = "whats7.mov";
9
⏺ Update(src/Scene7.tsx)
⎿  Added 4 lines, removed 1 line
55 const trimAfter = Math.ceil(silence.trailingStart * fps);
56
57 const overlayProgress = useSlideInProgress({ startAt: 0.5, ho
ldDuration: 2.5 });
58 - const videoX = interpolate(overlayProgress, [0, 1], [0, -20])
-;
58 + const listHoldDuration = (970 - 700) / fps;
59 + const overlay2Progress = useSlideInProgress({ startAt: 700 /
+fps, holdDuration: listHoldDuration });
60 + const combinedProgress = Math.max(overlayProgress, overlay2Pr
+ogress);
61 + const videoX = interpolate(combinedProgress, [0, 1], [0, -20]
+);
62
63 return (
64 <AbsoluteFill>
⏺ Update(src/Scene7.tsx)
⎿  Added 12 lines
75 <Sequence from={530} durationInFrames={Math.round(5 * fps
)} layout="none">
76 <AgentsBRoll />
77 </Sequence>
78 + <Sequence from={700} layout="none">
79 + <SlideInOverlay startAt={0} holdDuration={listHoldDurat
+ion}>
80 + <AnimatedList
81 + title="Agentic flow"
82 + items={[
83 + { label: "Single Studio Server", appearFrame: -1
+},
84 + { label: "No multiple lockfile warning", appearFr
+ame: 40 },
85 + { label: "Zod 4 supported", appearFrame: 240 },
86 + ]}
87 + />
88 + </SlideInOverlay>
89 + </Sequence>
90 </AbsoluteFill>
91 );
92 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
❯ in the rspack code overlay, the transition is already running while fading
in. there should be a longer hold period.
⏺ Done. Scene7 now has an AnimatedList overlay from frame 700 with:
- "Single Studio Server" visible immediately (no animation/sound)
- "No multiple lockfile warning" at frame 740 (40 frames into the Sequence)
- "Zod 4 supported" at frame 940 (240 frames in)
- Slides out at frame 970
Now addressing your follow-up about the Rspack code overlay:
Read 1 file (ctrl+o to expand)
⏺ The CodeTransition starts its token animation immediately (delay 0 or 7
frames). The CodeBRoll fade-in takes 0.2s = 6 frames, so the transition runs
while fading in. I need to increase the CodeBRoll fade-in or add a delay
before the code transition starts. The simplest fix: make the CodeBRoll show
the previousCode first and delay the transition.
Read 1 file (ctrl+o to expand)
⏺ The issue is that CodeTransition starts animating from frame 0 of its mount.
When we have previousCode, the transition runs immediately. I'll wrap it in a
Sequence to delay the code transition, showing the previous code first:
Read 1 file (ctrl+o to expand)
⏺ I'll add a Sequence with a delay so the previous code shows for ~1 second
before transitioning:
⏺ Update(src/CodeBRoll.tsx)
⎿  Added 1 line
1 import {
2 AbsoluteFill,
3 + Sequence,
4 interpolate,
5 useCurrentFrame,
6 useVideoConfig,
⏺ Update(src/CodeBRoll.tsx)
⎿  Added 18 lines, removed 6 lines
75
76 if (!data) return null;
77
78 + const transitionDelay = data.previousHighlighted ? Math.roun
+d(1 * fps) : 0;
79 +
80 return (
81 <AbsoluteFill style={{ opacity }}>
82 <ThemeProvider themeColors={data.themeColors}>
83 <AbsoluteFill style={{ backgroundColor: data.themeColo
rs.background }}>
82 - <CodeTransition
83 - previousCode={data.previousHighlighted}
84 - currentCode={data.highlighted}
85 - nextCode={null}
86 - topExplainerContent={topExplainer}
87 - />
84 + {data.previousHighlighted && transitionDelay > 0 &&
+frame < transitionDelay && (
85 + <CodeTransition
86 + previousCode={null}
87 + currentCode={data.previousHighlighted}
88 + nextCode={null}
89 + topExplainerContent={topExplainer}
90 + />
91 + )}
92 + <Sequence from={transitionDelay} layout="none">
93 + <CodeTransition
94 + previousCode={data.previousHighlighted}
95 + currentCode={data.highlighted}
96 + nextCode={null}
97 + topExplainerContent={topExplainer}
98 + />
99 + </Sequence>
100 </AbsoluteFill>
101 </ThemeProvider>
102 </AbsoluteFill>
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. The Rspack code overlay now shows the previous code (without Rspack
flag) for 1 second before transitioning to the version with
Config.setExperimentalRspackEnabled(true). This gives a clear hold period
before the animation starts.
✻ Cogitated for 1m 56s
❯ like we did for the web renderer demo, '/Users/jonathanburger/Desktop/Screen
Recording 2026-03-19 at 14.16.07.mov' add this b roll for the visual mode
(overlay over whats10.mov)
first zoom in, and show the bottom right corner (transform origin bottom right
corner)
⏺ Wait - the visual mode scene is Scene9 (whats9.mov, "Preview: Visual Mode"),
not whats10.mov. Let me check:
Searched for 1 pattern (ctrl+o to expand)
⏺ Visual Mode is Scene9 (whats9.mov). But you said whats10.mov — did you mean to
overlay it on whats10.mov (Mediabunny) or whats9.mov (Visual Mode)?
I'll go with whats9.mov since you said "visual mode". The screen recording is
already in public as agents-screen-recording.mov from before — but wait, this
is the same file path you used for the agents scene. Let me copy it with a
different name:
⏺ Bash(cp "/Users/jonathanburger/Desktop/Screen Recording 2026-03-19 at
14.16.07.mov" /Users/jonathanburger/whats-new/public/visual-mode-demo.mov)
⎿  Done
Read 1 file (ctrl+o to expand)
⏺ Write(src/Scene9.tsx)
⎿  Added 49 lines, removed 1 line
1 -import { AbsoluteFill, interpolate, staticFile, useVideoConfig
-} from "remotion";
1 +import {
2 + AbsoluteFill,
3 + Sequence,
4 + interpolate,
5 + spring,
6 + staticFile,
7 + useCurrentFrame,
8 + useVideoConfig,
9 +} from "remotion";
10 import { Video } from "@remotion/media";
11 import { SILENCES } from "./Composition";
12 import { SlideInOverlay, useSlideInProgress } from "./SlideInOv
erlay";
...
14
15 const FILE = "whats9.mov";
16
17 +const VisualModeDemo: React.FC = () => {
18 + const frame = useCurrentFrame();
19 + const { fps } = useVideoConfig();
20 +
21 + // Zoom from 1 to 1.5, transform origin bottom-right
22 + const zoomProgress = spring({
23 + frame,
24 + fps,
25 + config: { damping: 200 },
26 + durationInFrames: 30,
27 + });
28 + const scale = interpolate(zoomProgress, [0, 1], [1, 1.5]);
29 +
30 + return (
31 + <AbsoluteFill
32 + style={{
33 + backgroundColor: "#141414",
34 + justifyContent: "center",
35 + alignItems: "center",
36 + overflow: "hidden",
37 + }}
38 + >
39 + <Video
40 + src={staticFile("visual-mode-demo.mov")}
41 + muted
42 + playbackRate={2}
43 + style={{
44 + height: "100%",
45 + objectFit: "contain",
46 + transformOrigin: "bottom right",
47 + transform: `scale(${scale})`,
48 + }}
49 + />
50 + </AbsoluteFill>
51 + );
52 +};
53 +
54 export const Scene9: React.FC = () => {
55 const { fps } = useVideoConfig();
56 const silence = SILENCES[FILE];
...
72 <SlideInOverlay startAt={0.5} holdDuration={2.5}>
73 <NumberedChapter chapterNumber={8} chapterTitle="Previe
w: Visual Mode" />
74 </SlideInOverlay>
75 + <Sequence from={180} durationInFrames={Math.round(8 * fps
+)} premountFor={30}>
76 + <VisualModeDemo />
77 + </Sequence>
78 </AbsoluteFill>
79 );
80 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Added VisualModeDemo in Scene9 starting at frame 180 for 8 seconds. It
zooms from 1x to 1.5x with a smooth spring, transformOrigin: "bottom right" to
focus on the bottom-right corner, playing at 2x speed on a #141414
background.
✻ Brewed for 55s
❯ show it for 5 seconds only (make it faster, also trim off a bit off the start
and end)
⏺ Update(src/Scene9.tsx)
⎿  Added 2 lines, removed 1 line
39 <Video
40 src={staticFile("visual-mode-demo.mov")}
41 muted
42 - playbackRate={2}
42 + trimBefore={Math.floor(2 * fps)}
43 + playbackRate={3}
44 style={{
45 height: "100%",
46 objectFit: "contain",
⏺ Update(src/Scene9.tsx)
⎿  Added 1 line, removed 1 line
73 <SlideInOverlay startAt={0.5} holdDuration={2.5}>
74 <NumberedChapter chapterNumber={8} chapterTitle="Previe
w: Visual Mode" />
75 </SlideInOverlay>
76 - <Sequence from={180} durationInFrames={Math.round(8 * fps
-)} premountFor={30}>
76 + <Sequence from={180} durationInFrames={Math.round(5 * fps
+)} premountFor={30}>
77 <VisualModeDemo />
78 </Sequence>
79 </AbsoluteFill>
⏺ Done. Now 5 seconds, 3x speed, trimming 2 seconds off the start.
❯ then, don't fade out, but show another b roll immediately afterwards.
'/Users/jonathanburger/Desktop/Screen Recording 2026-03-19 at 14.59.05.mov'
also trim off a bit off the start and end. 70% of composition height.
background: #141414
⏺ Bash(cp "/Users/jonathanburger/Desktop/Screen Recording 2026-03-19 at
14.59.05.mov"
/Users/jonathanburger/whats-new/public/visual-mode-demo-2.mov)
⎿  Done
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene9.tsx)
⎿  Added 20 lines
76 <Sequence from={180} durationInFrames={Math.round(5 * fp
s)} premountFor={30}>
77 <VisualModeDemo />
78 </Sequence>
79 + <Sequence from={180 + Math.round(5 * fps)} durationInFra
+mes={Math.round(5 * fps)} premountFor={30}>
80 + <AbsoluteFill
81 + style={{
82 + backgroundColor: "#141414",
83 + justifyContent: "center",
84 + alignItems: "center",
85 + }}
86 + >
87 + <Video
88 + src={staticFile("visual-mode-demo-2.mov")}
89 + muted
90 + trimBefore={Math.floor(1 * fps)}
91 + playbackRate={2}
92 + style={{
93 + height: "70%",
94 + objectFit: "contain",
95 + }}
96 + />
97 + </AbsoluteFill>
98 + </Sequence>
99 </AbsoluteFill>
100 );
101 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Second b-roll starts immediately after the first (frame 330), plays for
5 seconds at 2x speed, trimming 1 second off the start, 70% height on #141414
background.
✻ Baked for 46s
❯ both of these b rolls should actually be in scene 10
Read 1 file (ctrl+o to expand)
⏺ Remove the b-rolls from Scene9 and create Scene10 with them:
⏺ Write(src/Scene9.tsx)
⎿  Removed 64 lines
1 import {
2 AbsoluteFill,
3 - Sequence,
3 interpolate,
5 - spring,
4 staticFile,
7 - useCurrentFrame,
5 useVideoConfig,
6 } from "remotion";
7 import { Video } from "@remotion/media";
...
11
12 const FILE = "whats9.mov";
13
17 -const VisualModeDemo: React.FC = () => {
18 - const frame = useCurrentFrame();
19 - const { fps } = useVideoConfig();
20 -
21 - // Zoom from 1 to 1.5, transform origin bottom-right
22 - const zoomProgress = spring({
23 - frame,
24 - fps,
25 - config: { damping: 200 },
26 - durationInFrames: 30,
27 - });
28 - const scale = interpolate(zoomProgress, [0, 1], [1, 1.5]);
29 -
30 - return (
31 - <AbsoluteFill
32 - style={{
33 - backgroundColor: "#141414",
34 - justifyContent: "center",
35 - alignItems: "center",
36 - overflow: "hidden",
37 - }}
38 - >
39 - <Video
40 - src={staticFile("visual-mode-demo.mov")}
41 - muted
42 - trimBefore={Math.floor(2 * fps)}
43 - playbackRate={3}
44 - style={{
45 - height: "100%",
46 - objectFit: "contain",
47 - transformOrigin: "bottom right",
48 - transform: `scale(${scale})`,
49 - }}
50 - />
51 - </AbsoluteFill>
52 - );
53 -};
54 -
14 export const Scene9: React.FC = () => {
15 const { fps } = useVideoConfig();
16 const silence = SILENCES[FILE];
...
32 <SlideInOverlay startAt={0.5} holdDuration={2.5}>
33 <NumberedChapter chapterNumber={8} chapterTitle="Previ
ew: Visual Mode" />
34 </SlideInOverlay>
76 - <Sequence from={180} durationInFrames={Math.round(5 * fp
-s)} premountFor={30}>
77 - <VisualModeDemo />
78 - </Sequence>
79 - <Sequence from={180 + Math.round(5 * fps)} durationInFra
-mes={Math.round(5 * fps)} premountFor={30}>
80 - <AbsoluteFill
81 - style={{
82 - backgroundColor: "#141414",
83 - justifyContent: "center",
84 - alignItems: "center",
85 - }}
86 - >
87 - <Video
88 - src={staticFile("visual-mode-demo-2.mov")}
89 - muted
90 - trimBefore={Math.floor(1 * fps)}
91 - playbackRate={2}
92 - style={{
93 - height: "70%",
94 - objectFit: "contain",
95 - }}
96 - />
97 - </AbsoluteFill>
98 - </Sequence>
35 </AbsoluteFill>
36 );
37 };
⏺ Write(src/Scene10.tsx)
⎿  Wrote 90 lines to src/Scene10.tsx
1 import {
2 AbsoluteFill,
3 Sequence,
4 interpolate,
5 spring,
6 staticFile,
7 useCurrentFrame,
8 useVideoConfig,
9 } from "remotion";
10 import { Video } from "@remotion/media";
… +80 lines (ctrl+o to expand)
⏺ Now wire Scene10 into the composition:
⏺ Update(src/Composition.tsx)
⎿  Added 1 line
10 import { Scene7 } from "./Scene7";
11 import { Scene8 } from "./Scene8";
12 import { Scene9 } from "./Scene9";
13 +import { Scene10 } from "./Scene10";
14
15 export const VIDEO_FILES = [
16 "whats1.mov",
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
89
90 elements.push(
91 <TransitionSeries.Sequence key={file} durationInFra
mes={durationInFrames} premountFor={30} name={SCENE_NAMES[file]
}>
92 - {file === "whats2.mov" ? <Scene2 /> : file === "w
-hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
-file === "whats5.mov" ? <Scene5 /> : file === "whats6.mov" ? <S
-cene6 /> : file === "whats7.mov" ? <Scene7 /> : file === "whats
-8.mov" ? <Scene8 /> : file === "whats9.mov" ? <Scene9 /> : <Vid
-eoScene file={file} />}
92 + {file === "whats2.mov" ? <Scene2 /> : file === "w
+hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
+file === "whats5.mov" ? <Scene5 /> : file === "whats6.mov" ? <S
+cene6 /> : file === "whats7.mov" ? <Scene7 /> : file === "whats
+8.mov" ? <Scene8 /> : file === "whats9.mov" ? <Scene9 /> : file
+ === "whats10.mov" ? <Scene10 /> : <VideoScene file={file} />}
93 </TransitionSeries.Sequence>,
94 );
95
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Moved both b-rolls from Scene9 to Scene10 (whats10.mov / Mediabunny).
Scene9 is now clean with just the numbered chapter overlay.
✻ Baked for 49s
❯ I accidentially provided the wrong value for visual-mode-demo.mov. replace it
with this video:
'/Users/jonathanburger/Downloads/display1773928533493 (1).mp4'
⏺ Bash(cp "/Users/jonathanburger/Downloads/display1773928533493 (1).mp4"
/Users/jonathanburger/whats-new/public/visual-mode-demo.mov)
⎿  Done
⏺ Done. Replaced public/visual-mode-demo.mov with the correct video.
❯ did I say bottom right? I meant bottom left
⏺ Update(src/Scene10.tsx)
⎿  Added 1 line, removed 1 line
41 style={{
42 height: "100%",
43 objectFit: "contain",
44 - transformOrigin: "bottom right",
44 + transformOrigin: "bottom left",
45 transform: `scale(${scale})`,
46 }}
47 />
⏺ Done.
❯ for the last scene, let's display another SlideOverlay. import content from
https://github.com/remotion-dev/remotion/blob/e55e9a633d49e0fe8c4505c6addc8cfb6
a41dbde/packages/template-recorder/remotion/scenes/EndCard/LeftSide.tsx and use
the remotion channels
⏺ Agent(Fetch EndCard LeftSide component)
⎿  Done (6 tool uses · 23.6k tokens · 1m 43s)
(ctrl+o to expand)
⏺ Now let me create a simplified, self-contained version for this project. I'll
need the Remotion avatar too.
Searched for 7 patterns, read 1 file (ctrl+o to expand)
⏺ Bash(cp /Users/jonathanburger/remotion2/packages/template-recorder/public/remo
tion.png /Users/jonathanburger/whats-new/public/remotion-avatar.png)
⎿  Done
⏺ Now let me read the themes config:
Read 1 file (ctrl+o to expand)
⏺ Now I'll create a self-contained EndCard component:
⏺ Write(src/EndCard.tsx)
⎿  Wrote 183 lines to src/EndCard.tsx
1 import React, { useMemo } from "react";
2 import {
3 AbsoluteFill,
4 Img,
5 interpolate,
6 spring,
7 staticFile,
8 useCurrentFrame,
9 useVideoConfig,
10 } from "remotion";
… +173 lines (ctrl+o to expand)
❯ in the visual mode, we have 2 b rolls. without interruption, add a third
one:'/Users/jonathanburger/Desktop/Screen Recording 2026-03-19 at 15.07.06.mov'
cut off the first 5 seconds, let it run at 2x speed for 3 seconds. 80% of
composition height, then #181818 as background
❯ /export
⏺ Now wire it into the last scene (whats11.mov):
Searched for 1 pattern (ctrl+o to expand)
⏺ Write(src/Scene11.tsx)
⎿  Wrote 39 lines to src/Scene11.tsx
1 import { AbsoluteFill, interpolate, staticFile, useVideoConfig }
from "remotion";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 import { EndCard } from "./EndCard";
6
7 const FILE = "whats11.mov";
8
9 export const Scene11: React.FC = () => {
10 const { fps } = useVideoConfig();
… +29 lines (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 1 line
11 import { Scene8 } from "./Scene8";
12 import { Scene9 } from "./Scene9";
13 import { Scene10 } from "./Scene10";
14 +import { Scene11 } from "./Scene11";
15
16 export const VIDEO_FILES = [
17 "whats1.mov",
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
90
91 elements.push(
92 <TransitionSeries.Sequence key={file} durationInFra
mes={durationInFrames} premountFor={30} name={SCENE_NAMES[file]
}>
93 - {file === "whats2.mov" ? <Scene2 /> : file === "w
-hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
-file === "whats5.mov" ? <Scene5 /> : file === "whats6.mov" ? <S
-cene6 /> : file === "whats7.mov" ? <Scene7 /> : file === "whats
-8.mov" ? <Scene8 /> : file === "whats9.mov" ? <Scene9 /> : file
- === "whats10.mov" ? <Scene10 /> : <VideoScene file={file} />}
93 + {file === "whats2.mov" ? <Scene2 /> : file === "w
+hats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 /> :
+file === "whats5.mov" ? <Scene5 /> : file === "whats6.mov" ? <S
+cene6 /> : file === "whats7.mov" ? <Scene7 /> : file === "whats
+8.mov" ? <Scene8 /> : file === "whats9.mov" ? <Scene9 /> : file
+ === "whats10.mov" ? <Scene10 /> : file === "whats11.mov" ? <Sc
+ene11 /> : <VideoScene file={file} />}
94 </TransitionSeries.Sequence>,
95 );
96
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  Error: Exit code 2
src/EndCard.tsx(1,17): error TS6133: 'useMemo' is declared but its value is
never read.
⏺ Update(src/EndCard.tsx)
⎿  Added 1 line, removed 1 line
1 -import React, { useMemo } from "react";
1 +import React from "react";
2 import {
3 AbsoluteFill,
4 Img,
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Created EndCard component with Remotion's channels (YouTube
@remotion_dev, X @remotion, Instagram @remotion, LinkedIn Remotion) with
avatar, subscribe button, and animated icon rows. It's shown as a
SlideInOverlay in Scene11 (Outro), staying until the scene ends.
Now addressing your other messages — let me add the third b-roll to Scene10:
⏺ Bash(cp "/Users/jonathanburger/Desktop/Screen Recording 2026-03-19 at
15.07.06.mov"
/Users/jonathanburger/whats-new/public/visual-mode-demo-3.mov)
⎿  Done
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene10.tsx)
⎿  Added 20 lines
85 />
86 </AbsoluteFill>
87 </Sequence>
88 + <Sequence from={180 + Math.round(10 * fps)} durationInFr
+ames={Math.round(3 * fps)} premountFor={30}>
89 + <AbsoluteFill
90 + style={{
91 + backgroundColor: "#181818",
92 + justifyContent: "center",
93 + alignItems: "center",
94 + }}
95 + >
96 + <Video
97 + src={staticFile("visual-mode-demo-3.mov")}
98 + muted
99 + trimBefore={Math.floor(5 * fps)}
100 + playbackRate={2}
101 + style={{
102 + height: "80%",
103 + objectFit: "contain",
104 + }}
105 + />
106 + </AbsoluteFill>
107 + </Sequence>
108 </AbsoluteFill>
109 );
110 };
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Added third b-roll in Scene10 immediately after the second one —
visual-mode-demo-3.mov with first 5 seconds trimmed, 2x speed, 3 seconds
duration, 80% height on #181818 background.
✻ Brewed for 5m 59s
❯ in the endcard, delay all animations by 1.2 seconds.
the button should have a smaller font weight
Read 1 file (ctrl+o to expand)
⏺ Update(src/EndCard.tsx)
⎿  Added 1 line, removed 1 line
77 const frame = useCurrentFrame();
78 const { fps } = useVideoConfig();
79
80 - const slideDelay = 20;
80 + const slideDelay = Math.round(1.2 * fps) + 20;
81 const slideDuration = 30;
82
83 const slideUp = spring({
⏺ Update(src/EndCard.tsx)
⎿  Added 1 line
125 alignItems: "center",
126 fontSize: 44,
127 ...FONT,
128 + fontWeight: 500,
129 }}
130 >
131 Subscribe
⏺ Done. All animations delayed by 1.2 seconds, subscribe button font weight
reduced to 500.
✻ Crunched for 33s
❯ make the endcard overlay only appear 7 seconds before the end of the video.
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene11.tsx)
⎿  Added 3 lines, removed 2 lines
13 const trimAfter = Math.ceil(silence.trailingStart * fps);
14 const sceneDuration = silence.trailingStart - silence.leading
End;
15
16 + const overlayStartAt = sceneDuration - 7 - 1; // 7s before en
+d, minus 1s for slide-in
17 const overlayProgress = useSlideInProgress({
17 - startAt: 0.5,
18 - holdDuration: sceneDuration - 0.5 - 1 - 1,
18 + startAt: overlayStartAt,
19 + holdDuration: 7 - 1,
20 });
21 const videoX = interpolate(overlayProgress, [0, 1], [0, -20])
;
22
⏺ Update(src/Scene11.tsx)
⎿  Added 2 lines, removed 2 lines
30 />
31 </AbsoluteFill>
32 <SlideInOverlay
33 - startAt={0.5}
34 - holdDuration={sceneDuration - 0.5 - 1 - 1}
33 + startAt={overlayStartAt}
34 + holdDuration={7 - 1}
35 >
36 <EndCard />
37 </SlideInOverlay>
⏺ Done. The endcard overlay now appears 7 seconds before the scene ends.
❯ in src/Scene10.tsx, all the b roll is too late, show all of it 5 seconds
earlier
Read 1 file (ctrl+o to expand)
⏺ Update(src/Scene10.tsx)
⎿  Added 1 line, removed 1 line
62 trimBefore={trimBefore}
63 trimAfter={trimAfter}
64 />
65 - <Sequence from={180} durationInFrames={Math.round(5 * fps
-)} premountFor={30}>
65 + <Sequence from={30} durationInFrames={Math.round(5 * fps)
+} premountFor={30}>
66 <VisualModeDemo />
67 </Sequence>
68 <Sequence from={180 + Math.round(5 * fps)} durationInFram
es={Math.round(5 * fps)} premountFor={30}>
⏺ Update(src/Scene10.tsx)
⎿  Error editing file
Searched for 3 patterns (ctrl+o to expand)
⏺ The replace_all only matched the first from={180}. The other two still
reference 180. Let me fix them:
⏺ Update(src/Scene10.tsx)
⎿  Added 1 line, removed 1 line
65 <Sequence from={30} durationInFrames={Math.round(5 * fps)
} premountFor={30}>
66 <VisualModeDemo />
67 </Sequence>
68 - <Sequence from={180 + Math.round(5 * fps)} durationInFram
-es={Math.round(5 * fps)} premountFor={30}>
68 + <Sequence from={30 + Math.round(5 * fps)} durationInFrame
+s={Math.round(5 * fps)} premountFor={30}>
69 <AbsoluteFill
70 style={{
71 backgroundColor: "#141414",
⏺ Update(src/Scene10.tsx)
⎿  Added 1 line, removed 1 line
85 />
86 </AbsoluteFill>
87 </Sequence>
88 - <Sequence from={180 + Math.round(10 * fps)} durationInFra
-mes={Math.round(3 * fps)} premountFor={30}>
88 + <Sequence from={30 + Math.round(10 * fps)} durationInFram
+es={Math.round(3 * fps)} premountFor={30}>
89 <AbsoluteFill
90 style={{
91 backgroundColor: "#181818",
❯ the endcard can have an infinite hold period, no need to transition it out
⏺ Done. All b-rolls in Scene10 now start at frame 30 (was 180), 5 seconds
earlier.
Now addressing the endcard — removing the slide-out:
⏺ Update(src/Scene11.tsx)
⎿  Added 2 lines, removed 2 lines
13 const trimAfter = Math.ceil(silence.trailingStart * fps);
14 const sceneDuration = silence.trailingStart - silence.leading
End;
15
16 - const overlayStartAt = sceneDuration - 7 - 1; // 7s before en
-d, minus 1s for slide-in
16 + const overlayStartAt = sceneDuration - 7 - 1;
17 const overlayProgress = useSlideInProgress({
18 startAt: overlayStartAt,
19 - holdDuration: 7 - 1,
19 + holdDuration: 9999,
20 });
21 const videoX = interpolate(overlayProgress, [0, 1], [0, -20])
;
22
⏺ Update(src/Scene11.tsx)
⎿  Added 1 line, removed 1 line
31 </AbsoluteFill>
32 <SlideInOverlay
33 startAt={overlayStartAt}
34 - holdDuration={7 - 1}
34 + holdDuration={9999}
35 >
36 <EndCard />
37 </SlideInOverlay>
⏺ Done. Endcard now has an effectively infinite hold period — it slides in and
stays.
✻ Churned for 1m 12s
❯ in scene 4, the vercel-screenshot.png b roll should have a ken burns effect.
transform origin is top center
⏺ The ImageBRoll already has a Ken Burns zoom + pan effect with transformOrigin:
"top center" by default. Let me check what's currently set:
Read 1 file (ctrl+o to expand)
⏺ The issue is that in Scene4, panY={0} and scale={1.12} — so it zooms but the
scale is static (doesn't animate). The scale prop is a fixed value, not an
animated one. Let me make the scale animate from 1 to the target value:
⏺ Update(src/ImageBRoll.tsx)
⎿  Added 6 lines, removed 1 line
40 { extrapolateLeft: "clamp", extrapolateRight: "clamp" },
41 );
42
43 + const currentScale = interpolate(frame, [0, duration], [1, sc
+ale], {
44 + extrapolateLeft: "clamp",
45 + extrapolateRight: "clamp",
46 + });
47 +
48 const translateY = interpolate(frame, [0, duration], [0, panY
], {
49 extrapolateLeft: "clamp",
50 extrapolateRight: "clamp",
...
65 height: "100%",
66 objectFit: "contain",
67 transformOrigin: "top center",
63 - transform: `scale(${scale}) translateY(${translateY}%
-)`,
68 + transform: `scale(${currentScale}) translateY(${trans
+lateY}%)`,
69 }}
70 />
71 </AbsoluteFill>
⏺ Done. The ImageBRoll now animates the scale from 1 to the target value over
the duration, giving a proper Ken Burns zoom effect. Transform origin is
already "top center".
❯ /export
⎿ Conversation exported to: /Users/jonathanburger/whats-new/2026-03-19-152321
-look-at-usersjonathanburgermovies-import-all-f.txt
❯ use remotion best practices to add a parameter for defining the platform to
post the video: "x", "youtube", "linkedin".
depending on it, the CTA text on the endcard button and the other social
platforms shown are dynamically changing.
⏺ Skill(remotion-best-practices)
⎿  Successfully loaded skill
Read 2 files (ctrl+o to expand)
⏺ Now let me install zod, then update the composition with a schema and make
EndCard platform-aware:
⏺ Bash(npm i --save-exact zod 2>&1 | tail -3)
⎿   npm audit fix --force
Run `npm audit` for details.
⎿  (timeout 30s)
Read 2 files (ctrl+o to expand)
⏺ Now update EndCard to accept a platform prop:
⏺ Write(src/EndCard.tsx)
⎿  Added 17 lines, removed 9 lines
17 fontWeight: 700,
18 };
19
20 -type Platform = "youtube" | "x" | "instagram" | "linkedin";
20 +export type EndCardPlatform = "youtube" | "x" | "linkedin";
21
22 -const CHANNELS: { platform: Platform; label: string }[] = [
22 +const CHANNELS: { platform: EndCardPlatform | "instagram"; labe
+l: string }[] = [
23 { platform: "youtube", label: "@remotion_dev" },
24 { platform: "x", label: "@remotion" },
25 { platform: "instagram", label: "@remotion" },
26 { platform: "linkedin", label: "Remotion" },
27 ];
28
29 +const CTA_TEXT: Record<EndCardPlatform, string> = {
30 + youtube: "Subscribe",
31 + x: "Follow",
32 + linkedin: "Follow",
33 +};
34 +
35 const YouTubeIcon: React.FC<{ height: number }> = ({ height })
=> (
36 <svg height={height} viewBox="0 0 576 512">
37 <path
...
68 </svg>
69 );
70
65 -const PlatformIcon: React.FC<{ platform: Platform; height: numb
-er }> = ({
71 +const PlatformIcon: React.FC<{ platform: string; height: number
+ }> = ({
72 platform,
73 height,
74 }) => {
...
79 return null;
80 };
81
76 -export const EndCard: React.FC = () => {
82 +export const EndCard: React.FC<{ platform: EndCardPlatform }> =
+ ({ platform }) => {
83 const frame = useCurrentFrame();
84 const { fps } = useVideoConfig();
85
...
94 durationInFrames: slideDuration,
95 });
96
97 + const otherChannels = CHANNELS.filter((c) => c.platform !==
+platform);
98 +
99 return (
100 <AbsoluteFill
101 style={{
...
109 transform: `translateY(${interpolate(slideUp, [0, 1]
, [200, 0])}px)`,
110 }}
111 >
104 - {/* Avatar + Subscribe button */}
112 + {/* Avatar + CTA button */}
113 <div style={{ display: "flex", alignItems: "center" }}
>
114 <Img
115 src={AVATAR}
...
136 fontWeight: 400,
137 }}
138 >
131 - Subscribe
139 + {CTA_TEXT[platform]}
140 </div>
141 </div>
134 - {/* Channel rows */}
142 + {/* Other channel rows */}
143 <div style={{ height: 60 }} />
136 - {CHANNELS.filter((c) => c.platform !== "youtube").map(
-(channel, i) => {
144 + {otherChannels.map((channel, i) => {
145 const opacity = spring({
146 fps,
147 frame,
148 config: { damping: 200 },
141 - delay: slideDelay + ((2 - i) / CHANNELS.length) *
-(slideDuration - 15),
149 + delay: slideDelay + ((otherChannels.length - 1 - i
+) / otherChannels.length) * (slideDuration - 15),
150 durationInFrames: 15,
151 });
152
❯ get inspired by the UpperReference component to make a new lower third for
showing my name in the first scene.
it should say:
Jonny Burger
Remotion
⏺ Now add the schema to the composition and pass the platform prop through:
Read 1 file (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 2 lines
1 import { AbsoluteFill, Sequence, staticFile, useVideoConfig } fr
om "remotion";
2 +import { z } from "zod";
3 +import type { EndCardPlatform } from "./EndCard";
4 import { Video, Audio } from "@remotion/media";
5 import { TransitionSeries } from "@remotion/transitions";
6 import { LightLeak } from "@remotion/light-leaks";
⏺ Update(src/Composition.tsx)
⎿  Added 6 lines
15 import { Scene10 } from "./Scene10";
16 import { Scene11 } from "./Scene11";
17
18 +export const MyCompositionSchema = z.object({
19 + platform: z.enum(["youtube", "x", "linkedin"]),
20 +});
21 +
22 +export type MyCompositionProps = z.infer<typeof MyCompositionSc
+hema>;
23 +
24 export const VIDEO_FILES = [
25 "whats1.mov",
26 "whats2.mov",
⏺ Now update MyComposition to accept and pass the platform prop:
Searched for 3 patterns (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
85 );
86 };
87
88 -export const MyComposition = () => {
88 +export const MyComposition: React.FC<MyCompositionProps> = ({ p
+latform }) => {
89 const { fps } = useVideoConfig();
90 const overlayDuration = Math.round(0.5 * fps);
91
⏺ Now pass platform to Scene11:
Searched for 5 patterns (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
98
99 elements.push(
100 <TransitionSeries.Sequence key={file} durationInFr
ames={durationInFrames} premountFor={30} name={SCENE_NAMES[fil
e]}>
101 - {file === "whats2.mov" ? <Scene2 /> : file === "
-whats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 />
-: file === "whats5.mov" ? <Scene5 /> : file === "whats6.mov" ?
- <Scene6 /> : file === "whats7.mov" ? <Scene7 /> : file === "w
-hats8.mov" ? <Scene8 /> : file === "whats9.mov" ? <Scene9 /> :
- file === "whats10.mov" ? <Scene10 /> : file === "whats11.mov"
- ? <Scene11 /> : <VideoScene file={file} />}
101 + {file === "whats2.mov" ? <Scene2 /> : file === "
+whats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 />
+: file === "whats5.mov" ? <Scene5 /> : file === "whats6.mov" ?
+ <Scene6 /> : file === "whats7.mov" ? <Scene7 /> : file === "w
+hats8.mov" ? <Scene8 /> : file === "whats9.mov" ? <Scene9 /> :
+ file === "whats10.mov" ? <Scene10 /> : file === "whats11.mov"
+ ? <Scene11 platform={platform} /> : <VideoScene file={file} /
+>}
102 </TransitionSeries.Sequence>,
103 );
104
⏺ Update Scene11 to accept and pass the platform:
⏺ Update(src/Scene11.tsx)
⎿  Added 1 line, removed 1 line
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { SlideInOverlay, useSlideInProgress } from "./SlideInOve
rlay";
5 -import { EndCard } from "./EndCard";
5 +import { EndCard, EndCardPlatform } from "./EndCard";
6
7 const FILE = "whats11.mov";
8
⏺ Update(src/Scene11.tsx)
⎿  Added 1 line, removed 1 line
6
7 const FILE = "whats11.mov";
8
9 -export const Scene11: React.FC = () => {
9 +export const Scene11: React.FC<{ platform: EndCardPlatform }> =
+ ({ platform }) => {
10 const { fps } = useVideoConfig();
11 const silence = SILENCES[FILE];
12 const trimBefore = Math.floor(silence.leadingEnd * fps);
⏺ Update(src/Scene11.tsx)
⎿  Added 1 line, removed 1 line
33 startAt={overlayStartAt}
34 holdDuration={9999}
35 >
36 - <EndCard />
36 + <EndCard platform={platform} />
37 </SlideInOverlay>
38 </AbsoluteFill>
39 );
⏺ Now update Root.tsx with the schema and defaultProps:
⏺ Update(src/Root.tsx)
⎿  Added 2 lines, removed 1 line
1 import "./index.css";
2 import { Composition, CalculateMetadataFunction } from "remotion
";
3 -import { MyComposition, VIDEO_FILES, SILENCES } from "./Composit
-ion";
3 +import { MyComposition, MyCompositionSchema, VIDEO_FILES, SILENC
+ES } from "./Composition";
4 +import type { MyCompositionProps } from "./Composition";
5 import { CodeTransitionDemo } from "./CodeTransitionDemo";
6
7 const FPS = 30;
⏺ Update(src/Root.tsx)
⎿  Added 1 line, removed 1 line
7 const FPS = 30;
8
9 const calculateMetadata: CalculateMetadataFunction<
10 - Record<string, unknown>
10 + MyCompositionProps
11 > = async () => {
12 let totalFrames = 0;
13 for (const file of VIDEO_FILES) {
⏺ Update(src/Root.tsx)
⎿  Added 2 lines
32 fps={FPS}
33 width={1920}
34 height={1080}
35 + schema={MyCompositionSchema}
36 + defaultProps={{ platform: "youtube" } satisfies MyCompo
+sitionProps}
37 calculateMetadata={calculateMetadata}
38 />
39 <Composition
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  Error: Exit code 2
src/Composition.tsx(3,1): error TS6133: 'EndCardPlatform' is declared but
its value is never read.
⏺ Update(src/Composition.tsx)
⎿  Removed 1 line
1 import { AbsoluteFill, Sequence, staticFile, useVideoConfig } fr
om "remotion";
2 import { z } from "zod";
3 -import type { EndCardPlatform } from "./EndCard";
3 import { Video, Audio } from "@remotion/media";
4 import { TransitionSeries } from "@remotion/transitions";
5 import { LightLeak } from "@remotion/light-leaks";
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Added a platform parameter with Zod schema ("youtube" | "x" |
"linkedin"). The EndCard now:
- Shows "Subscribe" for YouTube, "Follow" for X and LinkedIn
- Filters out the current platform from the social links list (e.g. on
YouTube, shows X, Instagram, LinkedIn)
- Default is "youtube", editable in the Studio sidebar
Now addressing your other message about the lower third:
⏺ Write(src/LowerThird.tsx)
⎿  Wrote 67 lines to src/LowerThird.tsx
1 import React from "react";
2 import {
3 AbsoluteFill,
4 interpolate,
5 spring,
6 useCurrentFrame,
7 useVideoConfig,
8 } from "remotion";
9
10 type LowerThirdProps = {
… +57 lines (ctrl+o to expand)
❯ which platform is selected should also affect the output name in
calculatemetadata
⏺ Now add it to Scene 1 (whats1.mov). Scene 1 doesn't have its own component yet
— it uses VideoScene directly. Let me check and create one if needed, or add
to the composition. Actually, let me check if there's already a Scene1:
Searched for 1 pattern (ctrl+o to expand)
⏺ Scene 1 uses the generic VideoScene. Let me create Scene1:
⏺ Write(src/Scene1.tsx)
⎿  Wrote 30 lines to src/Scene1.tsx
1 import { AbsoluteFill, Sequence, staticFile, useVideoConfig } fr
om "remotion";
2 import { Video } from "@remotion/media";
3 import { SILENCES } from "./Composition";
4 import { LowerThird } from "./LowerThird";
5
6 const FILE = "whats1.mov";
7
8 export const Scene1: React.FC = () => {
9 const { fps } = useVideoConfig();
10 const silence = SILENCES[FILE];
… +20 lines (ctrl+o to expand)
⏺ Update(src/Composition.tsx)
⎿  Added 1 line
3 import { Video, Audio } from "@remotion/media";
4 import { TransitionSeries } from "@remotion/transitions";
5 import { LightLeak } from "@remotion/light-leaks";
6 +import { Scene1 } from "./Scene1";
7 import { Scene2 } from "./Scene2";
8 import { Scene3 } from "./Scene3";
9 import { Scene4 } from "./Scene4";
⏺ Update(src/Composition.tsx)
⎿  Added 1 line, removed 1 line
98
99 elements.push(
100 <TransitionSeries.Sequence key={file} durationInFr
ames={durationInFrames} premountFor={30} name={SCENE_NAMES[fil
e]}>
101 - {file === "whats2.mov" ? <Scene2 /> : file === "
-whats3.mov" ? <Scene3 /> : file === "whats4.mov" ? <Scene4 />
-: file === "whats5.mov" ? <Scene5 /> : file === "whats6.mov" ?
- <Scene6 /> : file === "whats7.mov" ? <Scene7 /> : file === "w
-hats8.mov" ? <Scene8 /> : file === "whats9.mov" ? <Scene9 /> :
- file === "whats10.mov" ? <Scene10 /> : file === "whats11.mov"
- ? <Scene11 platform={platform} /> : <VideoScene file={file} /
->}
101 + {file === "whats1.mov" ? <Scene1 /> : file === "
+whats2.mov" ? <Scene2 /> : file === "whats3.mov" ? <Scene3 />
+: file === "whats4.mov" ? <Scene4 /> : file === "whats5.mov" ?
+ <Scene5 /> : file === "whats6.mov" ? <Scene6 /> : file === "w
+hats7.mov" ? <Scene7 /> : file === "whats8.mov" ? <Scene8 /> :
+ file === "whats9.mov" ? <Scene9 /> : file === "whats10.mov" ?
+ <Scene10 /> : file === "whats11.mov" ? <Scene11 platform={pla
+tform} /> : <VideoScene file={file} />}
102 </TransitionSeries.Sequence>,
103 );
104
⏺ Now address the defaultOutName in calculateMetadata:
Read 1 file (ctrl+o to expand)
⏺ Update(src/Root.tsx)
⎿  Added 2 lines, removed 1 line
8
9 const calculateMetadata: CalculateMetadataFunction<
10 MyCompositionProps
11 -> = async () => {
11 +> = async ({ props }) => {
12 let totalFrames = 0;
13 for (const file of VIDEO_FILES) {
14 const silence = SILENCES[file];
...
19
20 return {
21 durationInFrames: totalFrames,
22 + defaultOutName: `whats-new-${props.platform}.mp4`,
23 };
24 };
25
⏺ Bash(npx tsc --noEmit 2>&1)
⎿  (No output)
⏺ Done. Here's everything that was added:
1. Platform parameter — Zod schema with "youtube" | "x" | "linkedin", editable
in Studio sidebar, default "youtube"
2. EndCard — CTA button says "Subscribe" for YouTube, "Follow" for X/LinkedIn;
filters out the current platform from social links
3. Output name — calculateMetadata sets defaultOutName to
whats-new-${platform}.mp4
4. Lower third — New LowerThird component in Scene1 showing "Jonny Burger /
Remotion", springs in from bottom-left with slight rotation, animates out
before scene ends
✻ Crunched for 5m 12s
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