Disable AV1 and VP9 for video playback on YouTube
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// ==UserScript==
// @name Disable YouTube AV1 and VP9
// @description Disable AV1 and VP9 for video playback on YouTube
// @name:zh-TW 停用 YouTube AV1 和 VP9
// @description:zh-TW 停用 YouTube 的 AV1 和 VP9 影片播放
// @name:zh-HK 停用 YouTube AV1 和 VP9
// @description:zh-HK 停用 YouTube 的 AV1 和 VP9 影片播放
// @name:zh-CN 停用 YouTube AV1 和 VP9
// @description:zh-CN 停用 YouTube 的 AV1 和 VP9 视频播放
// @name:ja YouTube AV1 と VP9 の停用
// @description:ja YouTube の動画再生に AV1 と VP9 を停用する
// @name:ko YouTube AV1과 VP9 비활성화
// @description:ko YouTube의 동영상 재생에 AV1과 VP9를 비활성화하기
// @name:vi Vô hiệu hóa YouTube AV1 và VP9
// @description:vi Vô hiệu hóa AV1 và VP9 để phát video trên YouTube
// @name:de YouTube AV1 und VP9 deaktivieren
// @description:de Deaktiviert AV1 und VP9 für die Videowiedergabe auf YouTube
// @name:fr Désactiver YouTube AV1 et VP9
// @description:fr Désactivez AV1 et VP9 pour la lecture des vidéos sur YouTube
// @name:it Disabilita YouTube AV1 e VP9
// @description:it Disabilita AV1 e VP9 per la riproduzione dei video su YouTube
// @name:es Desactivar AV1 y VP9 en YouTube
// @description:es Desactivar AV1 y VP9 para la reproducción de videos en YouTube
// @namespace http://tampermonkey.net/
// @version 2.4.2
// @author CY Fung
// @match https://www.youtube.com/*
// @match https://www.youtube.com/embed/*
// @match https://www.youtube-nocookie.com/embed/*
// @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 chrome
// @compatible firefox
// @compatible opera
// @compatible edge
// @compatible safari
// @unwrap
// @allFrames true
// @inject-into page
// ==/UserScript==
(function () {
'use strict';
console.debug("disable-youtube-av1-and-vp9", "injected");
const flagConfig = () => {
let firstDa = true;
let cid = 0;
const { setInterval, clearInterval, setTimeout } = window;
const tn = () => {
const da = (window.ytcfg && window.ytcfg.data_) ? window.ytcfg.data_ : null;
if (!da) return;
const isFirstDa = firstDa;
firstDa = false;
for (const EXPERIMENT_FLAGS of [da.EXPERIMENT_FLAGS, da.EXPERIMENTS_FORCED_FLAGS]) {
if (EXPERIMENT_FLAGS) {
// EXPERIMENT_FLAGS.html5_disable_av1_hdr = true;
// EXPERIMENT_FLAGS.html5_prefer_hbr_vp9_over_av1 = true;
}
}
if (isFirstDa) {
let mo = new MutationObserver(() => {
mo.disconnect();
mo.takeRecords();
mo = null;
setTimeout(() => {
cid && clearInterval.call(window, cid);
cid = 0;
tn();
})
});
mo.observe(document, { subtree: true, childList: true });
}
};
cid = setInterval.call(window, tn);
};
const supportedFormatsConfig = () => {
function typeTest(type) {
if (typeof type === 'string' && type.startsWith('video/')) {
if (type.includes('vp9')) {
if (/codecs[\x20-\x7F]+\bvp9\b/.test(type)) return false;
} else if (type.includes('vp09')) {
if (/codecs[\x20-\x7F]+\bvp09\b/.test(type)) return false;
} else if (type.includes('av01')) {
if (/codecs[\x20-\x7F]+\bav01\b/.test(type)) return false;
} else if (type.includes('av1')) {
if (/codecs[\x20-\x7F]+\bav1\b/.test(type)) return false;
}
}
}
// 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 === 'video/webm; codecs="vp9"') res = false; // Prevent Invalid (ambiguous) video codec string: video/webm; codecs=vp9
else 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 disableAV1() {
// This is the setting to disable AV1
// localStorage['yt-player-av1-pref'] = '-1';
try {
Object.defineProperty(localStorage.constructor.prototype, 'yt-player-av1-pref', {
get() {
if (this === localStorage) return '-1';
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'] = '-1';
}
if (localStorage['yt-player-av1-pref'] !== '-1') {
console.warn('Disable YouTube AV1 and VP9', '"yt-player-av1-pref = -1" is not supported in your browser.');
return;
}
console.debug("disable-youtube-av1-and-vp9", "AV1 disabled by yt-player-av1-pref = -1");
}
disableAV1();
// flagConfig();
supportedFormatsConfig();
})();