☰

YouTube Codecs - Hardware Acceleration Only

Use codecs with hardware accleration supported for media playback on YouTube

  1. // ==UserScript==
  2. // @name                YouTube Codecs - Hardware Acceleration Only
  3. // @name:zh-TW          YouTube Codecs - Hardware Acceleration Only
  4. // @name:zh-HK          YouTube Codecs - Hardware Acceleration Only
  5. // @name:zh-CN          YouTube Codecs - Hardware Acceleration Only
  6. // @name:ja             YouTube Codecs - Hardware Acceleration Only
  7. // @name:ko             YouTube Codecs - Hardware Acceleration Only
  8. // @name:vi             YouTube Codecs - Hardware Acceleration Only
  9. // @name:de             YouTube Codecs - Hardware Acceleration Only
  10. // @name:fr             YouTube Codecs - Hardware Acceleration Only
  11. // @name:it             YouTube Codecs - Hardware Acceleration Only
  12. // @name:es             YouTube Codecs - Hardware Acceleration Only
  13. // @description         Use codecs with hardware accleration supported for media playback on YouTube
  14. // @description:zh-TW   Use codecs with hardware accleration supported for media playback on YouTube
  15. // @description:zh-HK   Use codecs with hardware accleration supported for media playback on YouTube
  16. // @description:zh-CN   Use codecs with hardware accleration supported for media playback on YouTube
  17. // @description:ja      Use codecs with hardware accleration supported for media playback on YouTube
  18. // @description:ko      Use codecs with hardware accleration supported for media playback on YouTube
  19. // @description:vi      Use codecs with hardware accleration supported for media playback on YouTube
  20. // @description:de      Use codecs with hardware accleration supported for media playback on YouTube
  21. // @description:fr      Use codecs with hardware accleration supported for media playback on YouTubee
  22. // @description:it      Use codecs with hardware accleration supported for media playback on YouTube
  23. // @description:es      Use codecs with hardware accleration supported for media playback on YouTube
  24. // @namespace           http://tampermonkey.net/
  25. // @version             0.0.2
  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. //
  38. // @compatible          firefox Violentmonkey
  39. // @compatible          firefox Tampermonkey
  40. // @compatible          firefox FireMonkey
  41. // @compatible          chrome Violentmonkey
  42. // @compatible          chrome Tampermonkey
  43. // @compatible          opera Violentmonkey
  44. // @compatible          opera Tampermonkey
  45. // @compatible          safari Stay
  46. // @compatible          edge Violentmonkey
  47. // @compatible          edge Tampermonkey
  48. // @compatible          brave Violentmonkey
  49. // @compatible          brave Tampermonkey
  50. //
  51. // @unwrap
  52. // @allFrames           true
  53. // @inject-into         page
  54. // ==/UserScript==
  55.  
  56. (function (__Promise__) {
  57.   'use strict';
  58.  
  59.   /** @type {globalThis.PromiseConstructor} */
  60.   const Promise = (async () => { })().constructor; // YouTube hacks Promise in WaterFox Classic and "Promise.resolve(0)" nevers resolve.
  61.  
  62.   if (typeof VideoEncoder !== 'function' || typeof VideoEncoder.isConfigSupported !== 'function') {
  63.     console.error('VideoEncoder.isConfigSupported is not supported');
  64.     return;
  65.   }
  66.  
  67.   const storageKey = '__codecs_vvgZHhgVKfAlY0__';
  68.   let useCache = false;
  69.   let useAV1 = false;
  70.   const getMap = () => {
  71.     const v = localStorage[storageKey]
  72.     if (v) {
  73.       try {
  74.         const obj = JSON.parse(v);
  75.         const resMap = new Map(Object.entries(obj));
  76.         useCache = true;
  77.         return resMap;
  78.       } catch (e) { }
  79.     }
  80.     return new Map();
  81.   }
  82.  
  83.   const objectKey = '__codecs_qyg8YVnvXJZ9E5__';
  84.  
  85.   const __codecs__ = window[objectKey] || (window[objectKey] = getMap());
  86.  
  87.   const testCodec = async (codec) => {
  88.  
  89.     if (!codec) return null;
  90.  
  91.     if (__codecs__.has(codec)) return __codecs__.get(codec);
  92.  
  93.     __codecs__.set(codec, null);
  94.  
  95.     const config = {
  96.       codec: codec,
  97.       hardwareAcceleration: 'prefer-hardware',
  98.       width: 1920,
  99.       height: 1080,
  100.       bitrate: 12_000_000,
  101.       bitrateMode: "variable",
  102.       framerate: 60,
  103.       sampleRate: 48000,
  104.       numberOfChannels: 2,
  105.     };
  106.  
  107.     let supported = false;
  108.  
  109.     try {
  110.       const resV = await VideoDecoder.isConfigSupported(config);
  111.       const resA = await AudioDecoder.isConfigSupported(config);
  112.       if (resV.supported === true || resA.supported === true) {
  113.         supported = true;
  114.       }
  115.     } catch (e) {
  116.       console.warn(e)
  117.     }
  118.  
  119.     __codecs__.set(codec, supported);
  120.  
  121.     return supported;
  122.  
  123.   }
  124.  
  125.   const getCodecResult = (codec) => {
  126.     if (codec.length === 30 && /^av01\.0\.\d\dM\.\d\d\b/.test(`${codec}`)) {
  127.       // av01.0.05M.08.0.110.05.01.06.0
  128.       codec = codec.substring(0, 13);
  129.       // av01.0.05M.08
  130.     }
  131.     let q = __codecs__.get(codec);
  132.     return q;
  133.   }
  134.  
  135.   // reference: https://cobalt.googlesource.com/cobalt/+/refs/tags/24.lts.40/starboard/nplb/media_can_play_mime_and_key_system_test_helpers.h
  136.   // https://cconcolato.github.io/media-mime-support/mediacapabilities.html
  137.  
  138.   if (useCache) {
  139.     console.log('[yt-codecs-hardware-acceleration-only] (init) load from cache')
  140.   } else {
  141.     Promise.all([
  142.       "avc1.420034",
  143.       "hvc1.1.6.L123.00",
  144.       "vp8",
  145.       // "vp09.00.10.08",
  146.       // "av01.0.04M.08",
  147.       "vp09.02.51.10.01.09.16.09.00",
  148.       "vp09.02.51.10.01.09.99.99.00",
  149.       "vp09.02.50.10.01.09.16.09.00",
  150.       "vp09.02.50.10.01.09.99.99.00",
  151.       "vp09.02.41.10.01.09.16.09.00",
  152.       "vp09.02.41.10.01.09.99.99.00",
  153.       "vp09.02.40.10.01.09.16.09.00",
  154.       "vp09.02.40.10.01.09.99.99.00",
  155.       "vp09.02.31.10.01.09.16.09.00",
  156.       "vp09.02.31.10.01.09.99.09.00",
  157.       "vp09.02.30.10.01.09.16.09.00",
  158.       "vp09.02.30.10.01.09.99.09.00",
  159.       "vp09.02.21.10.01.09.16.09.00",
  160.       "vp09.02.21.10.01.09.99.09.00",
  161.       "vp09.02.11.10.01.09.16.09.00",
  162.       "vp09.02.11.10.01.09.99.09.00",
  163.       "vp09.02.10.10.01.09.16.09.00",
  164.       "vp09.02.10.10.01.09.99.09.00",
  165.       "mp4a.40.5",
  166.       "mp4a.40.2",
  167.       "opus",
  168.       "vp9",
  169.       "vp09.00.51.08.01.01.01.01.00",
  170.       "vp09.00.51.08",
  171.       "vp09.00.50.08",
  172.       "vp09.00.41.08",
  173.       "vp09.00.40.08",
  174.       "vp09.00.31.08",
  175.       "vp09.00.30.08",
  176.       "vp09.00.21.08",
  177.       "vp09.00.20.08",
  178.       "vp09.00.11.08",
  179.       "vp09.00.10.08",
  180.       "avc1.640028",
  181.       "avc1.4d401e",
  182.       "avc1.4d4015",
  183.       "avc1.4d400c",
  184.       "avc1.42001E",
  185.       "avc1.4d401f",
  186.       "avc1.64001F",
  187.       "avc1.4d4020",
  188.       "avc1.64002a",
  189.       "avc1.64002A",
  190.       "avc1.4D4020",
  191.       "avc1.4D401F",
  192.       "avc1.4D401E",
  193.       "avc1.4D4015",
  194.       "avc1.4D400C",
  195.       "avc1.4d002a",
  196.       "avc1.4d0028",
  197.       "avc1.6e0034",
  198.  
  199.       "av01.0.00M.08",
  200.       "av01.0.01M.08",
  201.       "av01.0.02M.08",
  202.       "av01.0.03M.08",
  203.       "av01.0.04M.08",
  204.       "av01.0.05M.08",
  205.       "av01.0.06M.08",
  206.       "av01.0.07M.08",
  207.       "av01.0.08M.08",
  208.       "av01.0.09M.08",
  209.       "av01.0.12M.08",
  210.       "av01.0.13M.08",
  211.       "av01.0.14M.08",
  212.       "av01.0.15M.08",
  213.       "av01.0.16M.08",
  214.       "av01.0.17M.08",
  215.       "av01.0.18M.08",
  216.       "av01.0.19M.08",
  217.  
  218.  
  219.       "av01.0.00M.10",
  220.       "av01.0.01M.10",
  221.       "av01.0.02M.10",
  222.       "av01.0.03M.10",
  223.       "av01.0.04M.10",
  224.       "av01.0.05M.10",
  225.       "av01.0.06M.10",
  226.       "av01.0.07M.10",
  227.       "av01.0.08M.10",
  228.       "av01.0.09M.10",
  229.       "av01.0.12M.10",
  230.       "av01.0.13M.10",
  231.       "av01.0.14M.10",
  232.       "av01.0.15M.10",
  233.       "av01.0.16M.10",
  234.       "av01.0.17M.10",
  235.       "av01.0.18M.10",
  236.       "av01.0.19M.10",
  237.  
  238.  
  239.       /*
  240.  
  241.       "av01.0.00M.10.0.110.09.16.09.0",
  242.       "av01.0.01M.10.0.110.09.16.09.0",
  243.       "av01.0.02M.10.0.110.09.16.09.0",
  244.       "av01.0.03M.10.0.110.09.16.09.0",
  245.       "av01.0.04M.10.0.110.09.16.09.0",
  246.       "av01.0.05M.10.0.110.09.16.09.0",
  247.       "av01.0.06M.10.0.110.09.16.09.0",
  248.       "av01.0.07M.10.0.110.09.16.09.0",
  249.       "av01.0.08M.10.0.110.09.16.09.0",
  250.       "av01.0.09M.10.0.110.09.16.09.0",
  251.       "av01.0.12M.10.0.110.09.16.09.0",
  252.       "av01.0.13M.10.0.110.09.16.09.0",
  253.       "av01.0.14M.10.0.110.09.16.09.0",
  254.       "av01.0.15M.10.0.110.09.16.09.0",
  255.       "av01.0.16M.10.0.110.09.16.09.0",
  256.       "av01.0.17M.10.0.110.09.16.09.0",
  257.       "av01.0.18M.10.0.110.09.16.09.0",
  258.       "av01.0.19M.10.0.110.09.16.09.0",
  259.  
  260.  
  261.       "av01.0.00M.08.0.110.05.01.06.0",
  262.       "av01.0.01M.08.0.110.05.01.06.0",
  263.       "av01.0.02M.08.0.110.05.01.06.0",
  264.       "av01.0.03M.08.0.110.05.01.06.0",
  265.       "av01.0.04M.08.0.110.05.01.06.0",
  266.       "av01.0.05M.08.0.110.05.01.06.0",
  267.       "av01.0.06M.08.0.110.05.01.06.0",
  268.       "av01.0.07M.08.0.110.05.01.06.0",
  269.       "av01.0.08M.08.0.110.05.01.06.0",
  270.       "av01.0.09M.08.0.110.05.01.06.0",
  271.       "av01.0.12M.08.0.110.05.01.06.0",
  272.       "av01.0.13M.08.0.110.05.01.06.0",
  273.       "av01.0.14M.08.0.110.05.01.06.0",
  274.       "av01.0.15M.08.0.110.05.01.06.0",
  275.       "av01.0.16M.08.0.110.05.01.06.0",
  276.       "av01.0.17M.08.0.110.05.01.06.0",
  277.       "av01.0.18M.08.0.110.05.01.06.0",
  278.       "av01.0.19M.08.0.110.05.01.06.0",
  279.  
  280.  
  281.       "av01.0.00M.08.0.110.06.01.06.0",
  282.       "av01.0.01M.08.0.110.06.01.06.0",
  283.       "av01.0.02M.08.0.110.06.01.06.0",
  284.       "av01.0.03M.08.0.110.06.01.06.0",
  285.       "av01.0.04M.08.0.110.06.01.06.0",
  286.       "av01.0.05M.08.0.110.06.01.06.0",
  287.       "av01.0.06M.08.0.110.06.01.06.0",
  288.       "av01.0.07M.08.0.110.06.01.06.0",
  289.       "av01.0.08M.08.0.110.06.01.06.0",
  290.       "av01.0.09M.08.0.110.06.01.06.0",
  291.       "av01.0.12M.08.0.110.06.01.06.0",
  292.       "av01.0.13M.08.0.110.06.01.06.0",
  293.       "av01.0.14M.08.0.110.06.01.06.0",
  294.       "av01.0.15M.08.0.110.06.01.06.0",
  295.       "av01.0.16M.08.0.110.06.01.06.0",
  296.       "av01.0.17M.08.0.110.06.01.06.0",
  297.       "av01.0.18M.08.0.110.06.01.06.0",
  298.       "av01.0.19M.08.0.110.06.01.06.0",
  299.  
  300.       */
  301.  
  302.       "av01.0.00M.08",
  303.       "av01.0.00M.10",
  304.       "av01.0.00M.12",
  305.       "av01.0.00H.08",
  306.       "av01.0.00H.10",
  307.       "av01.0.00H.12",
  308.       "av01.0.01M.08",
  309.       "av01.0.01M.10",
  310.       "av01.0.01M.12",
  311.       "av01.0.01H.08",
  312.       "av01.0.01H.10",
  313.       "av01.0.01H.12",
  314.       "av01.0.02M.08",
  315.       "av01.0.02M.10",
  316.       "av01.0.02M.12",
  317.       "av01.0.02H.08",
  318.       "av01.0.02H.10",
  319.       "av01.0.02H.12",
  320.       "av01.0.03M.08",
  321.       "av01.0.03M.10",
  322.       "av01.0.03M.12",
  323.       "av01.0.03H.08",
  324.       "av01.0.03H.10",
  325.       "av01.0.03H.12",
  326.       "av01.0.04M.08",
  327.       "av01.0.04M.10",
  328.       "av01.0.04M.12",
  329.       "av01.0.04H.08",
  330.       "av01.0.04H.10",
  331.       "av01.0.04H.12",
  332.       "av01.0.05M.08",
  333.       "av01.0.05M.10",
  334.       "av01.0.05M.12",
  335.       "av01.0.05H.08",
  336.       "av01.0.05H.10",
  337.       "av01.0.05H.12",
  338.       "av01.0.06M.08",
  339.       "av01.0.06M.10",
  340.       "av01.0.06M.12",
  341.       "av01.0.06H.08",
  342.       "av01.0.06H.10",
  343.       "av01.0.06H.12",
  344.       "av01.0.07M.08",
  345.       "av01.0.07M.10",
  346.       "av01.0.07M.12",
  347.       "av01.0.07H.08",
  348.       "av01.0.07H.10",
  349.       "av01.0.07H.12",
  350.       "av01.0.08M.08",
  351.       "av01.0.08M.10",
  352.       "av01.0.08M.12",
  353.       "av01.0.08H.08",
  354.       "av01.0.08H.10",
  355.       "av01.0.08H.12",
  356.       "av01.0.09M.08",
  357.       "av01.0.09M.10",
  358.       "av01.0.09M.12",
  359.       "av01.0.09H.08",
  360.       "av01.0.09H.10",
  361.       "av01.0.09H.12",
  362.       "av01.0.10M.08",
  363.       "av01.0.10M.10",
  364.       "av01.0.10M.12",
  365.       "av01.0.10H.08",
  366.       "av01.0.10H.10",
  367.       "av01.0.10H.12",
  368.       "av01.0.11M.08",
  369.       "av01.0.11M.10",
  370.       "av01.0.11M.12",
  371.       "av01.0.11H.08",
  372.       "av01.0.11H.10",
  373.       "av01.0.11H.12",
  374.       "av01.0.12M.08",
  375.       "av01.0.12M.10",
  376.       "av01.0.12M.12",
  377.       "av01.0.12H.08",
  378.       "av01.0.12H.10",
  379.       "av01.0.12H.12",
  380.       "av01.0.13M.08",
  381.       "av01.0.13M.10",
  382.       "av01.0.13M.12",
  383.       "av01.0.13H.08",
  384.       "av01.0.13H.10",
  385.       "av01.0.13H.12",
  386.       "av01.0.14M.08",
  387.       "av01.0.14M.10",
  388.       "av01.0.14M.12",
  389.       "av01.0.14H.08",
  390.       "av01.0.14H.10",
  391.       "av01.0.14H.12",
  392.       "av01.0.15M.08",
  393.       "av01.0.15M.10",
  394.       "av01.0.15M.12",
  395.       "av01.0.15H.08",
  396.       "av01.0.15H.10",
  397.       "av01.0.15H.12",
  398.       "av01.0.16M.08",
  399.       "av01.0.16M.10",
  400.       "av01.0.16M.12",
  401.       "av01.0.16H.08",
  402.       "av01.0.16H.10",
  403.       "av01.0.16H.12",
  404.       "av01.0.17M.08",
  405.       "av01.0.17M.10",
  406.       "av01.0.17M.12",
  407.       "av01.0.17H.08",
  408.       "av01.0.17H.10",
  409.       "av01.0.17H.12",
  410.       "av01.0.18M.08",
  411.       "av01.0.18M.10",
  412.       "av01.0.18M.12",
  413.       "av01.0.18H.08",
  414.       "av01.0.18H.10",
  415.       "av01.0.18H.12",
  416.       "av01.0.19M.08",
  417.       "av01.0.19M.10",
  418.       "av01.0.19M.12",
  419.       "av01.0.19H.08",
  420.       "av01.0.19H.10",
  421.       "av01.0.19H.12",
  422.       "av01.0.20M.08",
  423.       "av01.0.20M.10",
  424.       "av01.0.20M.12",
  425.       "av01.0.20H.08",
  426.       "av01.0.20H.10",
  427.       "av01.0.20H.12",
  428.       "av01.0.21M.08",
  429.       "av01.0.21M.10",
  430.       "av01.0.21M.12",
  431.       "av01.0.21H.08",
  432.       "av01.0.21H.10",
  433.       "av01.0.21H.12",
  434.       "av01.0.22M.08",
  435.       "av01.0.22M.10",
  436.       "av01.0.22M.12",
  437.       "av01.0.22H.08",
  438.       "av01.0.22H.10",
  439.       "av01.0.22H.12",
  440.       "av01.0.23M.08",
  441.       "av01.0.23M.10",
  442.       "av01.0.23M.12",
  443.       "av01.0.23H.08",
  444.       "av01.0.23H.10",
  445.       "av01.0.23H.12",
  446.       "av01.0.31M.08",
  447.       "av01.0.31M.10",
  448.       "av01.0.31M.12",
  449.       "av01.0.31H.08",
  450.       "av01.0.31H.10",
  451.       "av01.0.31H.12",
  452.       "av01.1.00M.08",
  453.       "av01.1.00M.10",
  454.       "av01.1.00M.12",
  455.       "av01.1.00H.08",
  456.       "av01.1.00H.10",
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  949.       "avc1.f41014",
  950.       "avc1.f41015",
  951.       "avc1.f41016",
  952.       "avc1.f4101e",
  953.       "avc1.f4101f",
  954.       "avc1.f41020",
  955.       "avc1.f41028",
  956.       "avc1.f41029",
  957.       "avc1.f4102a",
  958.       "avc1.f41032",
  959.       "avc1.f41033",
  960.       "avc1.f41034",
  961.       "avc1.2c000a",
  962.       "avc1.2c000b",
  963.       "avc1.2c000c",
  964.       "avc1.2c000d",
  965.       "avc1.2c0014",
  966.       "avc1.2c0015",
  967.       "avc1.2c0016",
  968.       "avc1.2c001e",
  969.       "avc1.2c001f",
  970.       "avc1.2c0020",
  971.       "avc1.2c0028",
  972.       "avc1.2c0029",
  973.       "avc1.2c002a",
  974.       "avc1.2c0032",
  975.       "avc1.2c0033",
  976.       "avc1.2c0034",
  977.  
  978.       "av01.0.08H.10",
  979.       "hev1.1.6.L93.B0",
  980.       "hev1.2.4.L120.B0",
  981.  
  982.       "avc1.4d400b",
  983.       "mp4v.20.3",
  984.       "avc1.42001E, mp4a.40.2",
  985.       "avc1.64001F, mp4a.40.2",
  986.       "vp9.2",
  987.  
  988.       "av99.0.05M.08",
  989.       "ec-3",
  990.  
  991.       "ac-3",
  992.  
  993.     ].map(testCodec)).then(() => {
  994.  
  995.       try {
  996.         localStorage[storageKey] = JSON.stringify(Object.fromEntries(__codecs__.entries()));
  997.       } catch (e) { }
  998.  
  999.       console.log('[yt-codecs-hardware-acceleration-only] (init) check done')
  1000.     }).catch(console.warn);
  1001.   }
  1002.  
  1003.   const supportedFormatsConfig = () => {
  1004.  
  1005.     function typeTest(type) {
  1006.  
  1007.       if (typeof type === 'string' && type.startsWith('video/')) {
  1008.         if (useAV1) {
  1009.           if (type.includes('av01')) {
  1010.             if (/codecs[\x20-\x7F]+\bav01\b/.test(type)) return true;
  1011.           } else if (type.includes('av1')) {
  1012.             if (/codecs[\x20-\x7F]+\bav1\b/.test(type)) return true;
  1013.           }
  1014.         }
  1015.       }
  1016.  
  1017.     }
  1018.  
  1019.     // return a custom MIME type checker that can defer to the original function
  1020.     function makeModifiedTypeChecker(origChecker, dx) {
  1021.       // Check if a video type is allowed
  1022.       return function (type) {
  1023.  
  1024.         let m;
  1025.         if (m = /codecs="([^"\r\n]*?)"/.exec(type)) {
  1026.  
  1027.           const codec = m[1];
  1028.           const codecRes = getCodecResult(codec);
  1029.  
  1030.           if (codecRes === false) return "";
  1031.  
  1032.           if (codecRes === undefined) {
  1033.  
  1034.             testCodec(codec);
  1035.  
  1036.             console.warn('[yt-codecs-hardware-acceleration-only] new format', type)
  1037.  
  1038.           }
  1039.  
  1040.         }
  1041.  
  1042.         let res = undefined;
  1043.         if (type === undefined) res = false;
  1044.         else res = typeTest(type);
  1045.         if (res === undefined) res = origChecker.apply(this, arguments);
  1046.         else res = !dx ? res : (res ? "probably" : "");
  1047.  
  1048.         // console.debug(20, type, res)
  1049.  
  1050.         return res;
  1051.       };
  1052.     }
  1053.  
  1054.     // Override video element canPlayType() function
  1055.     const proto = (HTMLVideoElement || 0).prototype;
  1056.     if (proto && typeof proto.canPlayType == 'function') {
  1057.       proto.canPlayType = makeModifiedTypeChecker(proto.canPlayType, true);
  1058.     }
  1059.  
  1060.     // Override media source extension isTypeSupported() function
  1061.     const mse = window.MediaSource;
  1062.     // Check for MSE support before use
  1063.     if (mse && typeof mse.isTypeSupported == 'function') {
  1064.       mse.isTypeSupported = makeModifiedTypeChecker(mse.isTypeSupported);
  1065.     }
  1066.  
  1067.  
  1068.   }
  1069.  
  1070.   function enableAV1() {
  1071.     // This is the setting to force AV1
  1072.     // localStorage['yt-player-av1-pref'] = '8192';
  1073.     try {
  1074.       Object.defineProperty(localStorage.constructor.prototype, 'yt-player-av1-pref', {
  1075.         get() {
  1076.           if (this === localStorage) return '8192';
  1077.           return this.getItem('yt-player-av1-pref');
  1078.         },
  1079.         set(nv) {
  1080.           this.setItem('yt-player-av1-pref', nv);
  1081.           return true;
  1082.         },
  1083.         enumerable: true,
  1084.         configurable: true
  1085.       });
  1086.     } catch (e) {
  1087.       // localStorage['yt-player-av1-pref'] = '8192';
  1088.     }
  1089.     if (localStorage['yt-player-av1-pref'] !== '8192') {
  1090.       console.warn('Use YouTube AV1 is not supported in your browser.');
  1091.       return;
  1092.     }
  1093.     useAV1 = true;
  1094.   }
  1095.  
  1096.   let promise = null;
  1097.  
  1098.   try {
  1099.     promise = navigator.mediaCapabilities.decodingInfo({
  1100.       type: "file",
  1101.       video: {
  1102.         contentType: "video/mp4; codecs=av01.0.05M.08.0.110.05.01.06.0",
  1103.         height: 1080,
  1104.         width: 1920,
  1105.         framerate: 30,
  1106.         bitrate: 2826848,
  1107.       },
  1108.       audio: {
  1109.         contentType: "audio/webm; codecs=opus",
  1110.         channels: "2.1",
  1111.         samplerate: 44100,
  1112.         bitrate: 255236,
  1113.       }
  1114.     });
  1115.   } catch (e) {
  1116.     promise = null;
  1117.   }
  1118.  
  1119.   const msgAV1NotSupported = 'Your browser does not support AV1. You might conside to use the latest version of Google Chrome or Mozilla FireFox.';
  1120.  
  1121.   const callback = (result) => {
  1122.     if (result && result.supported && result.smooth) enableAV1();
  1123.     else {
  1124.       console.warn("yt-codecs-hardware-acceleration-only", msgAV1NotSupported);
  1125.     }
  1126.   };
  1127.  
  1128.   (promise || Promise.resolve(0)).catch(callback).then(callback);
  1129.  
  1130.   supportedFormatsConfig();
  1131.  
  1132. })(Promise);