Set Youtube player automatically to min quality.
// ==UserScript==
// @name Youtube Automatic Min Quality
// @namespace http://tampermonkey.net/
// @version 2024-03-08
// @description Set Youtube player automatically to min quality.
// @author Santeri Hetekivi
// @match *://*.youtube.com/*
// @icon https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant none
// @license Apache-2.0
// ==/UserScript==
(function () {
'use strict';
// Base timeout.
const TIMEOUT_MS = 100
// Selector for player.
const SELECTOR_PLAYER = ".html5-video-player"
// Min quality.
const MIN_QUALITY = "tiny"
/**
* Get element by selector.
* @param {string} selector For this selector.
* @param {function} callback Function to call with element.
* @param {?string} key If given, use this key for data.
*/
function getElementBySelector(selector, callback, key) {
// Get element by selector.
const element = document.querySelector(selector)
// Init data.
if (typeof getElementBySelector.data !== "object") {
getElementBySelector.data = {}
}
// If key is undefined
if (typeof key === "undefined") {
// generate key that is not in use.
do {
key = (Math.random() + 1).toString(36).substring(2)
} while (key in getElementBySelector.data)
}
// Else if key is not in use
else if (!(key in getElementBySelector.data)) {
// throw error.
throw new Error("Key '" + key + "' not found in getElementBySelector.data!")
}
// Key has data.
const keyHasData = (typeof getElementBySelector.data[key] === "object")
// If element found.
if (element) {
// If key has data
if (keyHasData) {
// and timeout is number
if (typeof getElementBySelector.data[key].timeout === "number") {
// clear timeout.
clearTimeout(getElementBySelector.data[key].timeout)
}
// delete data for key.
delete getElementBySelector.data[key]
}
// Callback with element.
callback(element)
}
// Else if element not found.
else {
// If key has no data
if (!keyHasData) {
// init data.
getElementBySelector.data[key] = { counter: 0, timeout: null }
}
// After timeout
getElementBySelector.data[key].timeout = setTimeout(
function () {
// call again with same key.
getElementBySelector(selector, callback, key)
},
(
// Wait base timeout
TIMEOUT_MS
*
// times updated counter.
(getElementBySelector.data[key].counter++)
)
)
}
}
// Init previous video id.
let videoIdPrevious = null
/**
* Run on url change.
*/
function onUrlChange() {
// Get video id from url.
const videoId = (new URLSearchParams(window.location.search)).get("v")
// If
if (
// did not get video id
videoId === null
||
// or video id did not change
videoId === videoIdPrevious
) {
// just return.
return
}
// Update previous video id.
videoIdPrevious = videoId
// Run for
getElementBySelector(
// video player
SELECTOR_PLAYER,
function (player) {
// set min quality.
player.setPlaybackQualityRange(MIN_QUALITY, MIN_QUALITY)
}
)
}
// Add event listener for
window.addEventListener(
// Youtube page data updated event.
'yt-page-data-updated',
function () {
onUrlChange()
}
)
// Run on url change once on first load.
onUrlChange()
})();