How to get audio buffer from video element? i know a ways from BaseAudioContext.decodeAudioData(). it fetch directly from audio file via request. but i need to get the buffer from video directly to manipulate.
const video = document.createElement('video');
video.src = 'https://www.w3schools.com/html/mov_bbb.mp4';
document.body.appendChild(video);
let audioCtx;
let audioSource;
const play = () => {
audioCtx = new AudioContext();
audioSource = audioCtx.createMediaElementSource(video);
audioSource.connect(audioCtx.destination);
video.play()
};
video.ontimeupdate = () => {
let buffer = new AudioBufferSourceNode(audioCtx);
// Manipulate audio buffer realtime
// Problem is buffer null
buffer.connect(audioSource.context.destination);
console.log(buffer.buffer)
}<!DOCTYPE html>
<html>
<body>
<button onclick="play()">Play</button>
</body>
</html>