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A simple as possible script to automatically change video quality to 720p (or higher if you want).
// ==UserScript==
// @name Youtube 720p
// @namespace sevanteri
// @description A simple as possible script to automatically change video quality to 720p (or higher if you want).
// @version 1.1
// @grant none
// @include *.youtube.com*
// ==/UserScript==
// Author: https://keybase.io/sevanteri
// Date: 2015-07-15
// License: GNU General Public License v3 (GPL)
// contentEval (http://wiki.greasespot.net/Content_Script_Injection)
(function (source) {
// Check for function input.
if ('function' == typeof source) {
// Execute this function with no arguments, by adding parentheses.
// One set around the function, required for valid syntax, and a
// second empty set calls the surrounded function.
source = '(' + source + ')();'
}
// Create a script node holding this source code.
var script = document.createElement('script');
script.setAttribute('type', 'application/javascript');
script.textContent = source;
// Insert the script node into the page, so it will run, and immediately
// remove it to clean up.
document.body.appendChild(script);
document.body.removeChild(script);
}) (function () {
// wanted quality
var quality = 'hd720';
// get player id
var yt = window.ytplayer;
if (!yt) return;
var yt = yt.config.attrs.id;
var w = window;
var d = document;
var t = null;
// player element
var p = null;
var origReady = w.onYouTubePlayerReady || function () {};
var setQ = function (q) {
if (p.getPlaybackQuality() != q) {
p.setPlaybackQuality(q);
}
}
w.onYouTubePlayerReady = function () {
p = d.getElementById(yt);
if (p) {
p.addEventListener('onStateChange', function (e) {
//console.log(e);
// When unstarted (-1) and buffering (3).
// Unstarted was sent only for the first video, so buffering
// state seemed like a good choice for other videos in the
// playlist.
if (e == - 1 || e == 3) {
clearTimeout(t);
setQ(quality);
}
});
}
origReady();
};
t = setTimeout(function () {
p = d.getElementById(yt);
setQ(quality);
}, 200);
});