Pause videos playing in other background tabs. When you start playback of a video in foreground tab, background playback will be paused.
// ==UserScript==
// @name YouTube - Pause background videos
// @namespace q1k
// @version 1.0.1
// @description Pause videos playing in other background tabs. When you start playback of a video in foreground tab, background playback will be paused.
// @author q1k
// @match *://www.youtube.com/*
// @grant none
// @run-at document-start
// ==/UserScript==
function findElement(selector) {
return new Promise(function(resolve) {
if (document.querySelector(selector)) {
return resolve(document.querySelector(selector));
}
const observer = new MutationObserver(function(mutations) {
if (document.querySelector(selector)) {
resolve(document.querySelector(selector));
observer.disconnect();
}
});
observer.observe(document, {
childList: true,
subtree: true
});
});
}
var video;
const channel = new BroadcastChannel("video-channel");
findElement("#player #movie_player video").then(function(el){
video = el;
/*if(!!(video.currentTime > 0 && !video.paused && !video.ended && video.readyState > 2)) {
channel.postMessage("pause");
}*/
Object.defineProperty(el, 'isplaying', {
get: function(){
return !!(this.currentTime > 0 && !this.paused && !this.ended && this.readyState > 2);
}
});
video.addEventListener("playing",function(){
//start play, send pause
if(document.hasFocus()){
channel.postMessage("pause");
}
})
});
channel.addEventListener("message",function(ev){
if(ev.data=="pause"){
//received pause
if(!document.hasFocus()){ //ignore if tab is active
if(video.isplaying) {
video.pause();
}
}
}
});