How to reduce the size of audio files?

[CatPrincess]

When I record audio by Chrome, the file's size if too big, 1 seconds is about 200 KB around. I want to know, is there any config to make the file's size smaller?

by the way, I use this lib to achieve voice chat. I do not need the high quality audio.

Any suggestion would help me, thanks in advance.

[philazzi44]

While not something part of this repo, I had a similar problem and went down the route of creating a PNaCL component that converts the captured .wav audio into an .ogg using libvorbis. That might be an avenue you can use to bring Chrome into a similar file size as Firefox provides natively via the MediaRecorder API.

[muaz-khan]

@CatPrincess You can use numberOfAudioChannels and bufferSize to reduce WAV size 3-times of the original:

var recrdRTC = RecordRTC(audioStream, {
    numberOfAudioChannels: 1,
    bufferSize: 256
});

Buffer-size lower-values may decrease the audio quality however numberOfAudioChannels will still affect and force generating half of the original WAV.

[muaz-khan]

There is an alternative ffmpeg-based solution as well:

• https://github.com/muaz-khan/Ffmpeg.js/blob/master/wav-to-ogg.html

BTW, there is audioconverter.js as well which is having 2MB minified file-size, I guess. There are many alternative solutions as well, e.g. http://stackoverflow.com/a/26245260/552182