How to record audio in format of mp3m4a JavaScript- recorder.js - Stack Overflow

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In recorderjs rec.exportWAV([callback][, type]) is used to generate a Blob object containing the recorded audio in WAV format.

But the WAV file is taking large space, for 30sec it is approximately 1mb. So I want to record the audio in format of mp3/m4a which takes less space.

Is there any way to record audio in format of mp3/m4a.

In recorderjs rec.exportWAV([callback][, type]) is used to generate a Blob object containing the recorded audio in WAV format.

But the WAV file is taking large space, for 30sec it is approximately 1mb. So I want to record the audio in format of mp3/m4a which takes less space.

Is there any way to record audio in format of mp3/m4a.

• javascript
• audio
• mp3
• audio-recording
• recorder.js

Share Improve this question Follow edited Aug 21, 2015 at 11:18 Manohar Gunturu asked Aug 21, 2015 at 11:13 Manohar GunturuManohar Gunturu 69611 gold badge1010 silver badges2323 bronze badges 1

• please to feedback on this – Adib Aroui Commented Jun 27, 2016 at 19:15

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3 Answers 3

Sorted by: Reset to default 2

Recorder.js does NOT support encoding captured audio as mp3.

It can only record 16 bit mono or stereo unpressed pcm as wav.

To halve the size you could record mono sound instead of 2 channel/stereo using numChannels:1 in the Recorder.js constructor like this:

var rec = new Recorder(source,{numChannels:1})

numChannels is an undocumented feature of Recorder.js (the library is not maintained anymore).

Source: https://blog.addpipe./using-recorder-js-to-capture-wav-audio-in-your-html5-web-site/

To record to mp3 you can use:

1. WebAudioRecorder.js which includes an asm.js version of the LAME mp3 encoder
2. vmsg which includes a WebAssembly version of the LAME mp3 encoder

i think you should check this link : HTML5 record audio to file

here u can change the audio type like this : type = type || config.type || 'audio/wav';

You can change the format of the recording by mentioning the format in exportWAV function, as follows:

recorder.exportWAV(function (blob) {
                callback(blob);

                // create WAV download link using audio data blob
                // createDownloadLink();

                // Clear the Recorder to start again !
                recorder.clear();
            }, "audio/mp3");

I have came to the above solution for the following link.

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