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Disable YouTube AV1

Disable AV1 for video playback on YouTube

  1. // ==UserScript==
  2. // @name                Disable YouTube AV1
  3. // @description         Disable AV1 for video playback on YouTube
  4. // @name:zh-TW          停用 YouTube AV1
  5. // @description:zh-TW   停用 YouTube 的 AV1 影片播放
  6. // @name:zh-HK          停用 YouTube AV1
  7. // @description:zh-HK   停用 YouTube 的 AV1 影片播放
  8. // @name:zh-CN          停用 YouTube AV1
  9. // @description:zh-CN   停用 YouTube 的 AV1 视频播放
  10. // @name:ja             YouTube AV1 停用
  11. // @description:ja      YouTube の動画再生に AV1 を停用する
  12. // @name:ko             YouTube AV1 비활성화
  13. // @description:ko      YouTube의 동영상 재생에 AV1을 비활성화하기
  14. // @name:vi             Vô hiệu hóa YouTube AV1
  15. // @description:vi      Vô hiệu hóa AV1 để phát video trên YouTube
  16. // @name:de             YouTube AV1 deaktivieren
  17. // @description:de      Deaktiviert AV1 für die Videowiedergabe auf YouTube
  18. // @name:fr             Désactiver YouTube AV1
  19. // @description:fr      Désactivez AV1 pour la lecture des vidéos sur YouTube
  20. // @name:it             Disabilita YouTube AV1
  21. // @description:it      Disabilita AV1 per la riproduzione dei video su YouTube
  22. // @name:es             Desactivar AV1 en YouTube
  23. // @description:es      Desactivar AV1 para la reproducción de videos en YouTube
  24. // @namespace           http://tampermonkey.net/
  25. // @version             2.4.3
  26. // @author              CY Fung
  27. // @match               https://www.youtube.com/*
  28. // @match               https://www.youtube.com/embed/*
  29. // @match               https://www.youtube-nocookie.com/embed/*
  30. // @exclude             https://www.youtube.com/live_chat*
  31. // @exclude             https://www.youtube.com/live_chat_replay*
  32. // @exclude             /^https?://\S+\.(txt|png|jpg|jpeg|gif|xml|svg|manifest|log|ini)[^\/]*$/
  33. // @icon                https://www.google.com/s2/favicons?sz=64&domain=youtube.com
  34. // @grant               none
  35. // @run-at              document-start
  36. // @license             MIT
  37. // @compatible          chrome
  38. // @compatible          firefox
  39. // @compatible          opera
  40. // @compatible          edge
  41. // @compatible          safari
  42. // @unwrap
  43. // @allFrames           true
  44. // @inject-into         page
  45. // ==/UserScript==
  46.  
  47. (function () {
  48.   'use strict';
  49.  
  50.   console.debug("disable-youtube-av1", "injected");
  51.  
  52.  
  53.  
  54.   const flagConfig = () => {
  55.  
  56.     let firstDa = true;
  57.     let cid = 0;
  58.     const { setInterval, clearInterval, setTimeout } = window;
  59.     const tn = () => {
  60.  
  61.       const da = (window.ytcfg && window.ytcfg.data_) ? window.ytcfg.data_ : null;
  62.       if (!da) return;
  63.  
  64.       const isFirstDa = firstDa;
  65.       firstDa = false;
  66.  
  67.       for (const EXPERIMENT_FLAGS of [da.EXPERIMENT_FLAGS, da.EXPERIMENTS_FORCED_FLAGS]) {
  68.  
  69.         if (EXPERIMENT_FLAGS) {
  70.           // EXPERIMENT_FLAGS.html5_disable_av1_hdr = true;
  71.           // EXPERIMENT_FLAGS.html5_prefer_hbr_vp9_over_av1 = true;
  72.         }
  73.  
  74.       }
  75.  
  76.       if (isFirstDa) {
  77.  
  78.  
  79.         let mo = new MutationObserver(() => {
  80.  
  81.           mo.disconnect();
  82.           mo.takeRecords();
  83.           mo = null;
  84.           setTimeout(() => {
  85.             cid && clearInterval.call(window, cid);
  86.             cid = 0;
  87.             tn();
  88.           })
  89.         });
  90.         mo.observe(document, { subtree: true, childList: true });
  91.  
  92.  
  93.       }
  94.  
  95.  
  96.     };
  97.     cid = setInterval.call(window, tn);
  98.  
  99.   };
  100.  
  101.   const supportedFormatsConfig = () => {
  102.  
  103.     function typeTest(type) {
  104.  
  105.       if (typeof type === 'string' && type.startsWith('video/')) {
  106.         if (type.includes('av01')) {
  107.           if (/codecs[\x20-\x7F]+\bav01\b/.test(type)) return false;
  108.         } else if (type.includes('av1')) {
  109.           if (/codecs[\x20-\x7F]+\bav1\b/.test(type)) return false;
  110.         }
  111.       }
  112.  
  113.     }
  114.  
  115.     // return a custom MIME type checker that can defer to the original function
  116.     function makeModifiedTypeChecker(origChecker, dx) {
  117.       // Check if a video type is allowed
  118.       return function (type) {
  119.         let res = undefined;
  120.         if (type === undefined) res = false;
  121.         else res = typeTest(type);
  122.         if (res === undefined) res = origChecker.apply(this, arguments);
  123.         else res = !dx ? res : (res ? "probably" : "");
  124.  
  125.         // console.debug(20, type, res)
  126.  
  127.         return res;
  128.       };
  129.     }
  130.  
  131.     // Override video element canPlayType() function
  132.     const proto = (HTMLVideoElement || 0).prototype;
  133.     if (proto && typeof proto.canPlayType == 'function') {
  134.       proto.canPlayType = makeModifiedTypeChecker(proto.canPlayType, true);
  135.     }
  136.  
  137.     // Override media source extension isTypeSupported() function
  138.     const mse = window.MediaSource;
  139.     // Check for MSE support before use
  140.     if (mse && typeof mse.isTypeSupported == 'function') {
  141.       mse.isTypeSupported = makeModifiedTypeChecker(mse.isTypeSupported);
  142.     }
  143.  
  144.   };
  145.  
  146.   function disableAV1() {
  147.  
  148.  
  149.  
  150.  
  151.     // This is the setting to disable AV1
  152.     // localStorage['yt-player-av1-pref'] = '-1';
  153.     try {
  154.       Object.defineProperty(localStorage.constructor.prototype, 'yt-player-av1-pref', {
  155.         get() {
  156.           if (this === localStorage) return '-1';
  157.           return this.getItem('yt-player-av1-pref');
  158.         },
  159.         set(nv) {
  160.           this.setItem('yt-player-av1-pref', nv);
  161.           return true;
  162.         },
  163.         enumerable: true,
  164.         configurable: true
  165.       });
  166.     } catch (e) {
  167.       // localStorage['yt-player-av1-pref'] = '-1';
  168.     }
  169.  
  170.     if (localStorage['yt-player-av1-pref'] !== '-1') {
  171.  
  172.       console.warn('Disable YouTube AV1', '"yt-player-av1-pref = -1" is not supported in your browser.');
  173.       return;
  174.     }
  175.  
  176.     console.debug("disable-youtube-av1", "AV1 disabled by yt-player-av1-pref = -1");
  177.  
  178.  
  179.   }
  180.  
  181.  
  182.   disableAV1();
  183.  
  184.   // flagConfig();
  185.   supportedFormatsConfig();
  186.  
  187.  
  188.  
  189.  
  190. })();