for reolink camera data extracted from SD card, pipe mp4s from sd card in order to remote host over ssh that runs ffmpeg to concatenate and encode them with nvidia cuda (nvenc)

reolink_ssh_ffmpeg.sh

#!/bin/bash

# example filename: RecS03_DST20250409_182755_183258_8B28808_EAA218.mp4
# example usage from folder: ./ffmpeg_ssh.sh 192.168.1.5 RecS03

set -euo pipefail
IFS=$'\n\t'

# Configuration
SRC_DIR="$PWD"
DEST_HOST="$1"
DATE="$(basename "$(pwd -P)")"
TARG="$2"
DEST_FILE="/media/data/${TARG}_${DATE}.mkv"
TMP_LIST="$(mktemp)"

# Colors
GREEN='\033[0;32m'
CYAN='\033[0;36m'
RED='\033[0;31m'
YELLOW='\033[1;33m'
NC='\033[0m'

cleanup() {
	rm -f "$TMP_LIST"
}
trap cleanup EXIT

echo -e "${CYAN}[*] Searching for ${TARG} videos in ${SRC_DIR}...${NC}"

if [[ ! -d "$SRC_DIR" ]]; then
	echo -e "${RED}[!] Source directory $SRC_DIR not found.${NC}"
	exit 1
fi

mapfile -t FILES < <(
	find "$SRC_DIR" -type f -iname "${TARG}*.mp4" \
		-newermt "$DATE" ! -newermt "$(date -I -d "$DATE + 1 day")" |
		sort
)

if [[ "${#FILES[@]}" -eq 0 ]]; then
	echo -e "${RED}[!] No files found for ${DATE}. Nothing to do.${NC}"
	exit 1
fi

for f in "${FILES[@]}"; do
	printf "file '%s'\n" "$f"
done >"$TMP_LIST"

echo -e "${GREEN}[+] Found ${#FILES[@]} files. Preparing stream...${NC}"

# Start FFmpeg pipeline
{
	ffmpeg -hide_banner -loglevel error \
		-f concat -safe 0 -protocol_whitelist "file,pipe" -i "$TMP_LIST" \
		-c:v copy -c:a copy -f matroska -
} | ssh "$DEST_HOST" bash -c "'
  set -e
  echo -e \"${YELLOW}[*] Receiving stream... Encoding to ${DEST_FILE}${NC}\"
  ffmpeg -hide_banner -loglevel error \
    -f matroska -i - \
    -c:v hevc_nvenc -preset fast -c:a copy -y \"$DEST_FILE\"
  echo -e \"${GREEN}[✓] Video saved to $DEST_FILE${NC}\"
'"

echo -e "${GREEN}[✓] Operation complete.${NC}"