Boost audio of a video in Google Drive

boost-audio-in-browser.js

// Step 1: Open developer console
// Step 2: Select the correct console context. At the moment it is embed/youtube.googleapis.com
// Step 3: Paste the code below to console and hit Enter / Return. It will boost audio to 1000%.

(function boost(multiplier = 10.0) {
  const video = document.querySelector('video');
  if (!video) return console.error('No video element found.');

  // Create or reuse existing Web Audio API context chain
  window.audioCtx = window.audioCtx || new (window.AudioContext || window.webkitAudioContext)();
  window.gainNode = window.gainNode || window.audioCtx.createGain();
  window.audioSrc = window.audioSrc || window.audioCtx.createMediaElementSource(video);

  // Apply volume multiplier and connect nodes
  window.gainNode.gain.value = multiplier;
  window.audioSrc.connect(window.gainNode).connect(window.audioCtx.destination);

  console.log(`Audio boosted to ${multiplier * 100}%`);
})();

// You can then control the multiplier by running: window.gainNode.gain.value = 4.0;

This is how you select correct console context for Step 2: