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Youtube 720p

A simple as possible script to automatically change video quality to 720p (or higher if you want).

  1. // ==UserScript==
  2. // @name             Youtube 720p
  3. // @namespace        sevanteri
  4. // @description      A simple as possible script to automatically change video quality to 720p (or higher if you want).
  5. // @version          1.1
  6. // @grant            none
  7. // @include          *.youtube.com*
  8. // ==/UserScript==
  9. // Author: https://keybase.io/sevanteri
  10. // Date: 2015-07-15
  11. // License: GNU General Public License v3 (GPL)
  12.  
  13. // contentEval (http://wiki.greasespot.net/Content_Script_Injection)
  14. (function (source) {
  15.     // Check for function input.
  16.     if ('function' == typeof source) {
  17.         // Execute this function with no arguments, by adding parentheses.
  18.         // One set around the function, required for valid syntax, and a
  19.         // second empty set calls the surrounded function.
  20.         source = '(' + source + ')();'
  21.     }
  22.     // Create a script node holding this  source code.
  23.  
  24.     var script = document.createElement('script');
  25.     script.setAttribute('type', 'application/javascript');
  26.     script.textContent = source;
  27.     // Insert the script node into the page, so it will run, and immediately
  28.     // remove it to clean up.
  29.     document.body.appendChild(script);
  30.     document.body.removeChild(script);
  31. }) (function () {
  32.     // wanted quality
  33.     var quality = 'hd720';
  34.     // get player id
  35.     var yt = window.ytplayer;
  36.     if (!yt) return;
  37.     var yt = yt.config.attrs.id;
  38.     
  39.     var w = window;
  40.     var d = document;
  41.     var t = null;
  42.     // player element
  43.     var p = null;
  44.     var origReady = w.onYouTubePlayerReady || function () {};
  45.  
  46.     var setQ = function (q) {
  47.         if (p.getPlaybackQuality() != q) {
  48.             p.setPlaybackQuality(q);
  49.         }
  50.     }
  51.  
  52.     w.onYouTubePlayerReady = function () {
  53.         p = d.getElementById(yt);
  54.         if (p) {
  55.             p.addEventListener('onStateChange', function (e) {
  56.                 //console.log(e);
  57.                 // When unstarted (-1) and buffering (3).
  58.                 // Unstarted was sent only for the first video, so buffering
  59.                 // state seemed like a good choice for other videos in the
  60.                 // playlist.
  61.                 if (e == - 1 || e == 3) {
  62.                     clearTimeout(t);
  63.                     setQ(quality);
  64.                 }
  65.             });
  66.         }
  67.         origReady();
  68.     };
  69.     t = setTimeout(function () {
  70.         p = d.getElementById(yt);
  71.         setQ(quality);
  72.     }, 200);
  73. });