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Test Info:
<html>
<head>
<script>
function start () {
const canvas = document.getElementById("c")
canvas.getContext("2d")
const video = canvas.captureStream()
const ac = new AudioContext()
const dest = ac.createMediaStreamDestination()
const recorder = new MediaRecorder(
new MediaStream([...video.getTracks(), ...dest.stream.getTracks()]), {
'mimeType': 'audio/ogg'
})
recorder.start()
}
window.addEventListener('load', start)
</script>
</head>
<body>
<canvas id="c"></canvas>
</body>
</html>