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Play Single Video Only

Pause your background video when you play another video in another tab.

  1. // ==UserScript==
  2. // @name        Play Single Video Only
  3. // @namespace   UserScript
  4. // @match       https://www.youtube.com/*
  5. // @match       https://www.facebook.com/*
  6. // @version     1.2
  7. // @license     MIT
  8. // @author      CY Fung
  9. // @description Pause your background video when you play another video in another tab.
  10. // @run-at      document-start
  11. // @grant       GM_addValueChangeListener
  12. // @grant       GM.setValue
  13. // ==/UserScript==
  14.  
  15. (() => {
  16.  
  17.   const ways = {
  18.     'www.youtube.com': {
  19.       findVideo: () => {
  20.  
  21.         return document.querySelector('#movie_player video');
  22.  
  23.       },
  24.       testVideo: (video) => {
  25.  
  26.         if (video.volume > 1e-5 && video.muted === false) {
  27.  
  28.         } else {
  29.           return false;
  30.         }
  31.  
  32.         if (HTMLElement.prototype.matches.call(video, '#movie_player video')) return true;
  33.  
  34.       }
  35.     },
  36.     'www.facebook.com': {
  37.       findVideo: () => {
  38.  
  39.         return [...document.querySelectorAll('#watch_feed video')].filter(elm => elm.paused === false)[0]
  40.  
  41.       },
  42.       testVideo: (video) => {
  43.  
  44.         if (video.volume > 1e-5 && video.muted === false) {
  45.  
  46.         } else {
  47.           return false;
  48.         }
  49.  
  50.         if (HTMLElement.prototype.matches.call(video, '#watch_feed video')) return true;
  51.  
  52.       }
  53.     }
  54.  
  55.   };
  56.  
  57.   const { findVideo, testVideo } = ways[location.hostname];
  58.  
  59.   if (typeof findVideo !== 'function' || typeof testVideo !== 'function') return;
  60.  
  61.  
  62.   GM_addValueChangeListener("t9opC", function (key, oldValue, newValue, remote) {
  63.     if (remote) {
  64.       let video = findVideo();
  65.       if (video && video.paused === false && video.volume > 1e-5 && video.muted === false && testVideo(video)) {
  66.         HTMLVideoElement.prototype.pause.call(video);
  67.       }
  68.     }
  69.   });
  70.  
  71.   document.addEventListener('play', function (evt) {
  72.  
  73.     if (!evt || !evt.isTrusted) return;
  74.     const target = (evt || 0).target;
  75.     if (target instanceof HTMLVideoElement) {
  76.       if (testVideo(target)) {
  77.         GM.setValue('t9opC', Date.now());
  78.       }
  79.     }
  80.   }, true);
  81.  
  82. })();

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