How to record flac codec audio via JS/AJAX

Question

I am trying to record audio as flac codec instead of opus codec. How can I do that? I have tried setting codec to flac:

let blob = new Blob(audioChunks,{type: 'audio/ogg; codecs=flac' });

I also tried this:

var options = {
    audioBitsPerSecond : 32000,
   mimeType: 'audio/ogg; codecs=flac' 
}
var mediaRecorder = new MediaRecorder(audioStream,options);

But when audio is recorded and saved, I check properties it say codec is opus.

Markus · Accepted Answer · 2022-08-20 17:59:36Z

1

You can check, if a codec is supported using:

MediaRecorder.isTypeSupported('audio/ogg;codecs=opus')

As far as I know FLAC isn't supported by current browsers. You can convert the recording on client side using Flac.js or you simply convert it on the backend.

answered Aug 20, 2022 at 17:59

Markus

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2 Comments

Cezary Tomczyk Over a year ago

Just a note that browsers sometimes claims they support particular codec, but in reality that may not be true. You can see live test: sitelint.com/lab/media-recoder-supported-mime-type

Konstantin Tarkus Over a year ago

WEBM container + OPUS codec can be a good option in many cases: MediaRecorder.isTypeSupported('audio/webm;codecs=opus')

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