// ==UserScript==
// @name         YouTube Default Audio Track
// @namespace    bp-yt-audio-track-default
// @version      1.4
// @description  Makes it possible to select the desired Audio Track played by default.
// @author       BuIlDaLiBlE
// @match        https://www.youtube.com/*
// @match        https://www.youtube-nocookie.com/*
// @icon         https://www.youtube.com/favicon.ico
// @grant        none
// @run-at       document-end
// @license      MIT
// ==/UserScript==
"use strict";
const DESIRED_AUDIO_TRACK = "original"; // The desired audio track name (can be partial)
window.addEventListener("yt-navigate-finish", main, true);
const observer = new MutationObserver(
(mutations, shortsReady = false, videoPlayerReady = false) =>
{
outer: for(const mutation of mutations)
{
for(const node of mutation.addedNodes)
{
if(!shortsReady)
{
shortsReady = node.tagName === "YTD-SHORTS";
}
if(!videoPlayerReady)
{
videoPlayerReady = typeof node.className === "string" && node.className.includes("html5-main-video");
}
if(shortsReady || videoPlayerReady)
{
observer.disconnect();
main();
break outer;
}
}
}
}
);
observer.observe(document.documentElement,
{
childList: true,
subtree: true,
});
async function main()
{
let player = getPlayer();
while(!player)
{
player = getPlayer();
await new Promise(resolve => setTimeout(resolve, 5));
}
forceAudioTrack(player);
}
function getPlayer()
{
let player;
if(window.location.href.includes("youtube.com/shorts"))
{
player = document.querySelector("#shorts-player");
}
else
{
player = document.querySelector("#movie_player");
}
return player;
}
function forceAudioTrack(player)
{
try
{
const availableAudioTracks = player.getAvailableAudioTracks();
const currentAudioTrack = player.getAudioTrack();
let languageObject;
if(availableAudioTracks === undefined || availableAudioTracks.length == 0)
{
return;
}
for(let object in currentAudioTrack)
{
if(currentAudioTrack[object].name)
{
languageObject = object;
break;
}
}
if(!currentAudioTrack[languageObject].name.toLowerCase().includes(DESIRED_AUDIO_TRACK.toLowerCase()))
{
for(const track of availableAudioTracks)
{
if(track[languageObject].name.toLowerCase().includes(DESIRED_AUDIO_TRACK.toLowerCase()))
{
player.setAudioTrack(track);
break;
}
}
}
}
catch(error)
{
console.error("Error setting Audio Track:", error.message);
}
}