Use AV1 for video playback on YouTube
// ==UserScript==
// @name Use YouTube AV1
// @description Use AV1 for video playback on YouTube
// @name:zh-TW 使用 YouTube AV1
// @description:zh-TW 使用 AV1 進行 YouTube 影片播放
// @name:zh-HK 使用 YouTube AV1
// @description:zh-HK 使用 AV1 進行 YouTube 影片播放
// @name:zh-CN 使用 YouTube AV1
// @description:zh-CN 使用 AV1 进行 YouTube 视频播放
// @name:ja YouTube AV1 の使用
// @description:ja YouTube の動画再生に AV1 を使用する
// @name:ko YouTube AV1 사용
// @description:ko YouTube의 동영상 재생에 AV1을 사용하기
// @name:vi Sử dụng YouTube AV1
// @description:vi Sử dụng AV1 để phát video trên YouTube
// @name:de YouTube AV1 verwenden
// @description:de Verwende AV1 für die Videowiedergabe auf YouTube
// @name:fr Utiliser YouTube AV1
// @description:fr Utiliser AV1 pour la lecture des vidéos sur YouTube
// @name:it Usa YouTube AV1
// @description:it Usa AV1 per la riproduzione dei video su YouTube
// @name:es Usar AV1 en YouTube
// @description:es Usar AV1 para la reproducción de videos en YouTube
// @namespace http://tampermonkey.net/
// @version 2.4.5
// @author CY Fung
// @match https://www.youtube.com/*
// @match https://www.youtube.com/embed/*
// @match https://www.youtube-nocookie.com/embed/*
// @match https://m.youtube.com/*
// @exclude https://www.youtube.com/live_chat*
// @exclude https://www.youtube.com/live_chat_replay*
// @exclude /^https?://\S+\.(txt|png|jpg|jpeg|gif|xml|svg|manifest|log|ini)[^\/]*$/
// @icon https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant none
// @run-at document-start
// @license MIT
//
// @compatible firefox Violentmonkey
// @compatible firefox Tampermonkey
// @compatible firefox FireMonkey
// @compatible chrome Violentmonkey
// @compatible chrome Tampermonkey
// @compatible opera Violentmonkey
// @compatible opera Tampermonkey
// @compatible safari Stay
// @compatible edge Violentmonkey
// @compatible edge Tampermonkey
// @compatible brave Violentmonkey
// @compatible brave Tampermonkey
//
// @unwrap
// @allFrames true
// @inject-into page
// ==/UserScript==
(function (__Promise__) {
'use strict';
/** @type {globalThis.PromiseConstructor} */
const Promise = (async () => { })().constructor; // YouTube hacks Promise in WaterFox Classic and "Promise.resolve(0)" nevers resolve.
console.debug("use-youtube-av1", "injected");
const supportedFormatsConfig = () => {
function typeTest(type) {
if (typeof type === 'string' && type.startsWith('video/')) {
if (type.includes('av01')) {
if (/codecs[\x20-\x7F]+\bav01\b/.test(type)) return true;
} else if (type.includes('av1')) {
if (/codecs[\x20-\x7F]+\bav1\b/.test(type)) return true;
}
}
}
// return a custom MIME type checker that can defer to the original function
function makeModifiedTypeChecker(origChecker, dx) {
// Check if a video type is allowed
return function (type) {
let res = undefined;
if (type === undefined) res = false;
else res = typeTest(type);
if (res === undefined) res = origChecker.apply(this, arguments);
else res = !dx ? res : (res ? "probably" : "");
// console.debug(20, type, res)
return res;
};
}
// Override video element canPlayType() function
const proto = (HTMLVideoElement || 0).prototype;
if (proto && typeof proto.canPlayType == 'function') {
proto.canPlayType = makeModifiedTypeChecker(proto.canPlayType, true);
}
// Override media source extension isTypeSupported() function
const mse = window.MediaSource;
// Check for MSE support before use
if (mse && typeof mse.isTypeSupported == 'function') {
mse.isTypeSupported = makeModifiedTypeChecker(mse.isTypeSupported);
}
}
function enableAV1() {
// This is the setting to force AV1
// localStorage['yt-player-av1-pref'] = '8192';
try {
Object.defineProperty(localStorage.constructor.prototype, 'yt-player-av1-pref', {
get() {
if (this === localStorage) return '8192';
return this.getItem('yt-player-av1-pref');
},
set(nv) {
this.setItem('yt-player-av1-pref', nv);
return true;
},
enumerable: true,
configurable: true
});
} catch (e) {
// localStorage['yt-player-av1-pref'] = '8192';
}
if (localStorage['yt-player-av1-pref'] !== '8192') {
console.warn("use-youtube-av1", 'Use YouTube AV1 is not supported in your browser.');
return;
}
console.debug("use-youtube-av1", "AV1 enabled");
supportedFormatsConfig();
}
let promise = null;
try {
promise = navigator.mediaCapabilities.decodingInfo({
type: "file",
video: {
contentType: "video/mp4; codecs=av01.0.05M.08.0.110.05.01.06.0",
height: 1080,
width: 1920,
framerate: 30,
bitrate: 2826848,
},
audio: {
contentType: "audio/webm; codecs=opus",
channels: "2.1",
samplerate: 44100,
bitrate: 255236,
}
});
} catch (e) {
promise = null;
}
const callback = (result) => {
if (result && result.supported && result.smooth) enableAV1();
else {
console.warn("force-youtube-av1", 'Your browser does not support AV1. You might conside to use the latest version of Google Chrome or Mozilla FireFox.');
}
};
(promise || Promise.resolve(0)).catch(callback).then(callback);
})(Promise);