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RecordRTC Audio into Ogg Chrome

See original GitHub issue

Hi !

First thanks a lot for all the work done.

When I use RecordRTC demo in Chrome (v 43.0.2357.81 - 64bits) with Audio into OGG selected, the downloaded file is in WAV format.

Is that normal ? Is it possible to record audio in OGG with Chrome ?

I tried to set the options like this :

var options = {
    mimeType : 'audio/ogg',
    bitsPerSecond: 128000
};

But this is not working…

Regards

Issue Analytics

State:
Created 8 years ago
Comments:7 (3 by maintainers)

Top GitHub Comments

1reaction

muaz-khancommented, Jun 18, 2016

Regarding CODECS:

Chrome supports VP9+VP8 along with opus vorbis audio (48kHz). PS: H.264 coming soon.
Firefox supports VP8 along with opus vorbis audio (44.1 kHz).

Regarding CONTAINER_FORMATS,

Chrome supports audio/webm, video/webm, video/webm;codecs=vp8 and video/webm;codecs=vp9
Firefox supports audio/webm, audio/ogg, video/webm, video/mp4 and video/webm;codecs=vp8

Regarding BITRATES:

Chrome supports opus_MIN 6kbps and opus_MAX 128kbps
Chrome supports VPX_MIN 100kbps and no max limit
Firefox supports VPX_default 2.5Mbps however audio default is adaptive dependant on the sample rate and number of audio channels

So you’ll always get audio/webm in Chrome rather than audio/ogg. You can change the file-extension (mp3/ogg) or file-type (audio/mp3 or audio/ogg) however Audio_RAW_DATA headers will be using audio/webm

Nowadays both Chrome+Firefox are accepting audioBitsPerSecond, videoBitsPerSecond as well as bitsPerSecond optional values (as 2nd-parameter over MediaRecorder API).

0reactions

hexadecycommented, Jan 2, 2017

Tested on

Windows 10 + Chrome 55 and Firefox 50

Media Stream options

type: “audio”

As a workaround change that part in RecordRTC.js

Firefox will record in audio/ogg Chrome will record in audio/webm

function GetRecorderType(mediaStream, config) {    
//...
    if (isMediaRecorderCompatible() && recorder !== CanvasRecorder && recorder !== GifRecorder && typeof MediaRecorder !== 'undefined' && 'requestData' in MediaRecorder.prototype) {
        if (mediaStream.getVideoTracks().length || (mediaStream.getAudioTracks().length && MediaRecorder.isTypeSupported('audio/webm'))) {
        recorder = MediaStreamRecorder;
        }
    }
//...

Pull request

How many previous version we want to support in this lib? Chrome 46, 47-48, 49… ? I think it’s better to check for MediaRecorder type support than specific version of Chrome like version 49 in isMediaRecorderCompatible(). ref: https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder/isTypeSupported

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