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# FFmpeg 常用轉檔指令整理與說明

本文件整理了常見的 `ffmpeg` 用法，包括 H.264 Profile 轉換、影片解析度縮放、保留音訊等操作方式，並提供詳細參數說明。

- 這裡有各種格式影片素材可以下載: https://test-videos.co.uk/

## 1. 使用 FFmpeg 產生有畫面與聲音的測試影片

```sh
resolution=640x360 # 畫面大小

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編號	作品名稱	發行日期	首發平台	其他平台（部分）	維基百科連結
1	Final Fantasy	1987-12-18	Famicom	NES、PlayStation、WonderSwan Color、GBA、PSP、iOS、Android、Windows、Switch、PS4	Final Fantasy
2	Final Fantasy II	1988-12-17	Famicom	PlayStation、WonderSwan Color、GBA、PSP、iOS、Android、Windows、Switch、PS4	[Final Fantasy II](https://en.wikiped

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Download

1. Go to https://store.rg-adguard.net.
2. Search for the HEVC Video Extensions from Device Manufacturer (Microsoft.HEVCVideoExtension) app by entering the following store URL.

   https://www.microsoft.com/en-us/p/hevc-video-extensions-from-device-manufacturer/9n4wgh0z6vhq
   

   • Do not use the normal HEVC Video Extensions app URL, because that can't play HEVC videos in Windows Media Player for some inscrutable reason.
3. Download the x64 appx file, or whatever your Windows architecture is.
   • You may have to right click › Save Link As because the URL scheme is http, not https, if your browser is set to enforce HTTPS-only mode.

• If it tries to save as a filename that's just a GUID, you may copy the correct .appx filename and save it as that instead.

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// from http://scratch99.com/web-development/javascript/convert-bytes-to-mb-kb/
function bytesToSize(bytes) {
    var sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
    if (bytes == 0) return 'n/a';
    var i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
    if (i == 0) return bytes + ' ' + sizes[i];
    return (bytes / Math.pow(1024, i)).toFixed(1) + ' ' + sizes[i];
};

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# Version key/value should be on his own line
PACKAGE_VERSION=$(cat package.json \
  | grep version \
  | head -1 \
  | awk -F: '{ print $2 }' \
  | sed 's/[",]//g')

echo $PACKAGE_VERSION

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前言

這兩年多虧於 VTuber 的盛行，動態捕捉從原先軟硬體價格昂貴難以上手，到現在越來越多適合獨立創作者的軟體盛行，入門的門檻也一天比一天降低許多。此表單整理我這陣子試過適合直播的動態捕捉軟體，包含 Live2D、3D、半身捕捉、全身捕捉等，希望對有興趣的人有幫助，有錯誤或補充資訊也歡迎提出。

Yan-K / 2020.06.08 社群平台：Website | Facebook | Twitter | Plurk | Twitch

【2D】- 免費

PrprLive

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// JSON to Uint8Array parsing and visa versa
// (Intended Bluetooth communication on Cordova)

var JsonToArray = function(json)
{
	var str = JSON.stringify(json, null, 0);
	var ret = new Uint8Array(str.length);
	for (var i = 0; i < str.length; i++) {
		ret[i] = str.charCodeAt(i);
	}

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// array buffer to JSON
const dataString JSON.stringify(Array.from(new Uint8Array(arrayBuffer)));

// send around

// JSON to ArrayBuffer
new Uint8Array(JSON.parse(dataString)).buffer

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Scene control

Calls without a key argument

These affect the calling scene only.

Example:

this.scene.start()

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// --
// The MIT License
// 
// Copyright (c) 2013 tatsuhiko yamamura
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR