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audio file format

See original GitHub issue


I am trying to record audio in the browser

    const {
    } = useReactMediaRecorder({
        video: false,
        audio: true,
        blobPropertyBag: {
            type: "audio/wav"

and fetching the file from it

            const audioBlob = await fetch(mediaBlobUrl).then(r => r.blob());


            const audiofile = new File([audioBlob], `${uuidv4()}.wav`, { type: "audio/wav" })

Now i saved this file in disk, and used file audio.wav

and it shows up as as WebM file

$ file b61508fa-9c4e-47fc-bb54-5def7abf9bfc.wav                                                         ─╯
b61508fa-9c4e-47fc-bb54-5def7abf9bfc.wav: WebM

what i need is a wav file ! and it is giving me a WebM file

Issue Analytics

  • State:open
  • Created 3 years ago
  • Comments:13 (2 by maintainers)

github_iconTop GitHub Comments

0x006Fcommented, Nov 29, 2020

blobPropertyBag is used only for generating the blobs (after the recording has been completed) inside the media recorder. If you want to use a specific codec to use, you need to pass through mediaRecorderOptions. It’ll check for the browser support first and will emit a console.error if there’s no support. I’d say not to use the blobPropertyBag if it’s not a big-deal. It’s just a placeholder for extending the Blob object. Or else we need to keep them in-sync.

That being said, currently this library defaults to video/mp4 / audio/wav while generating the blob, which is kinda incorrect. That needs to be fixed.

For a quick conversion, I’d suggest ffmepg, which has webm --> wav support I believe.

olegpanchenkocommented, Aug 23, 2022
 useReactMediaRecorder({ mediaRecorderOptions: { mimeType: 'audio/wav' } });
Read more comments on GitHub >

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