Set initial video quality for embedded YouTube videos based on a set of preferred video qualities, as well as minimum and maximum video qualities (configured in the script).
// ==UserScript==
// @name Embedded YouTube Video Quality Preference
// @namespace https://greasyfork.org/en/users/85671-jcunews
// @version 1.0.1
// @license AGPLv3
// @author jcunews
// @description Set initial video quality for embedded YouTube videos based on a set of preferred video qualities, as well as minimum and maximum video qualities (configured in the script).
// @match *://www.youtube.com/embed/*
// @grant none
// ==/UserScript==
(() => {
//=== CONFIGURATION BEGIN ===
//One or more video quality IDs. From most to least prioritized video quality.
//e.g. if ["hd720", "medium"], try using "hd720" quality first. If not available, use "medium" quality. If it's also not available, use YouTube's default.
var qualities = [""]; //Set to [] if no preference
//Minimum video quality. Set it to "" to use lowest quality available.
//If ID is not empty and is not available, use the available one which is a higher quality.
var minQuality = "";
//Maximum video quality. For slow network or low computer specifications. Set it to "" to use highest quality available.
//If ID is not empty and is not available, use the available one which is a lower quality.
var maxQuality = "";
//minQuality and maxQuality have higher priority than the qualities variable.
//e.g. if qualities is ["hd2160", "hd720"], minQuality is "hd1080", and maxQuality is "hd1440", YouTube's default will be used.
//maxQuality rule is applied after minQuality rule has been aplied.
//i.e. the rule priorities are: qualities, minQuality, then maxQuality.
//To always use the maximum video quality available, set minQuality and maxQuality to "highres". The qualities variable will be ignored.
//To always use the minimum video quality available, set minQuality and maxQuality to "tiny". The qualities variable will be ignored.
/* Available video quality IDs:
"tiny" (144p)
"small" (240p)
"medium" (360p)
"large" (480p)
"hd720" (720p)
"hd1080" (1080p)
"hd1440" (1440p)
"hd2160" (2160p)
"hd2880" (2880p)
"highres" (4320p; YouTube's highest resolution [2019 April])
*/
//=== CONFIGURATION END ===
var sb = document.querySelector(".ytp-settings-button");
if (!sb) return;
var sq = {
"144p": "tiny", "240p": "small", "360p": "medium", "480p": "large", "720p": "hd720", "1080p": "hd1080",
"1440p": "hd1440", "2160p": "hd2160", "2880p": "hd2880", "4320p": "highres"
}, p = player.querySelector(".html5-video-player"), v = p.querySelector(".html5-main-video"), play = v.play, resm = {};
["tiny", "small", "medium", "large", "hd720", "hd1080", "hd1440", "hd2160", "highres"].forEach((r, i) => resm[r] = i);
v.play = function() {
var sty = document.head.appendChild(document.createElement("STYLE"));
sty.innerHTML = '.ytp-settings-menu{display:none}';
v.play = play;
sb.click();
document.querySelectorAll(".ytp-settings-menu .ytp-menuitem-label").forEach(l => {
if (l.textContent !== "Quality") return;
l.click();
setTimeout(() => {
var
es = Array.from(document.querySelectorAll(".ytp-quality-menu .ytp-menuitem-label span")),
qs = [], qsm = {}, esm = {}, cq = p.getPlaybackQuality(), q = cq;
es.pop();
es.reverse();
var ss = es.map((e, s, n) => {
s = e.firstChild.data;
qs.push(n = sq[s]);
qsm[n] = resm[n];
esm[n] = e.parentNode;
return s;
});
if (!minQuality || (qsm[minQuality] === undefined)) minQuality = qs[0];
if (!maxQuality || (qsm[maxQuality] === undefined)) maxQuality = qs[qs.length - 1];
qualities = qualities.filter(
v => (qsm[v] !== undefined) && (resm[v] >= resm[minQuality]) && (resm[v] <= resm[maxQuality])
);
if (qualities.length) {
q = qualities[0];
} else {
if (resm[cq] <= resm[minQuality]) q = minQuality;
if (resm[cq] >= resm[maxQuality]) q = maxQuality;
}
if (q !== cq) {
esm[q].click();
} else v.play();
sty.click();
sty.remove();
}, 0);
});
};
})();