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YouTube - Volume Adjustment by 5%

Increments the audio volume of YouTube videos by 5%.

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Install this script 
  1. // ==UserScript==
  2. // @name                       YouTube - Volume Adjustment by 5%
  3. // @name:fr                    YouTube - Ajustement du volume de 5%
  4. // @name:es                    YouTube - Ajuste del volumen en 5%
  5. // @name:de                    YouTube - Lautstärkeanpassung um 5%
  6. // @name:it                    YouTube - Regolazione del volume del 5%
  7. // @name:zh-CN                 YouTube - 音量调节 5%
  8. // @namespace                  https://gist.github.com/4lrick/0c225473e9609302c6dd6f0dfa4f22a3
  9. // @version                    1.3
  10. // @description                Increments the audio volume of YouTube videos by 5%.
  11. // @description:fr             Augmente le volume audio des vidéos YouTube de 5%.
  12. // @description:es             Aumenta el volumen de audio de los videos de YouTube en un 5%.
  13. // @description:de             Erhöht die Lautstärke der YouTube-Videos um 5%.
  14. // @description:it             Aumenta il volume audio dei video YouTube del 5%.
  15. // @description:zh-CN          将 YouTube 视频的音频音量增加 5%。
  16. // @author                     4lrick
  17. // @match                      https://www.youtube.com/*
  18. // @icon                       https://www.google.com/s2/favicons?sz=64&domain=youtube.com
  19. // @grant                      none
  20. // @license                    GPL-3.0-only
  21. // ==/UserScript==
  22.  
  23. (function() {
  24.     'use strict';
  25.  
  26.     function adjustVolume(player) {
  27.         const currentVolume = player.getVolume();
  28.         const adjustedVolume = Math.round(currentVolume / 5) * 5;
  29.  
  30.         if (adjustedVolume !== currentVolume) {
  31.             player.setVolume(adjustedVolume);
  32.             updateLocalStorage(adjustedVolume);
  33.         }
  34.     }
  35.  
  36.     function updateLocalStorage(volume) {
  37.         const playerVolume = localStorage.getItem('yt-player-volume');
  38.         if (!playerVolume) return;
  39.  
  40.         const volumeData = JSON.parse(playerVolume);
  41.         volumeData.data = JSON.stringify({
  42.             volume: volume,
  43.             muted: JSON.parse(volumeData.data).muted
  44.         });
  45.  
  46.         localStorage.setItem('yt-player-volume', JSON.stringify(volumeData));
  47.     }
  48.  
  49.     function checkVideoExists() {
  50.         const videoElement = document.querySelector('video');
  51.         const player = document.getElementById('movie_player');
  52.  
  53.         if (!videoElement || !player) return;
  54.  
  55.         videoElement.addEventListener('volumechange', () => adjustVolume(player));
  56.         adjustVolume(player);
  57.         observer.disconnect();
  58.     }
  59.  
  60.     const observer = new MutationObserver(checkVideoExists);
  61.     observer.observe(document.body, { childList: true, subtree: true });
  62.     checkVideoExists();
  63. })();