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I have made a program that generates a blob (containing PCM data) from a recording using the new HTML5 getusermedia api however; these recordings can get pretty big and I hoped that the files could be pressed before sending them to the server. I know that mp3/ogg pression is way out of what a browser can handle (i think) so I looked elsewhere.

Some people talk about http pression (that would also use Gzip) but isn't that a browser-server decision when setting up munication?

I found ; it has a javascript implementation for the client and php for the server but would this even make sensor for audio?

Does anybody have any experience with pressing audio on the client side (without using flash)

I have made a program that generates a blob (containing PCM data) from a recording using the new HTML5 getusermedia api however; these recordings can get pretty big and I hoped that the files could be pressed before sending them to the server. I know that mp3/ogg pression is way out of what a browser can handle (i think) so I looked elsewhere.

Some people talk about http pression (that would also use Gzip) but isn't that a browser-server decision when setting up munication?

I found https://github./olle/lz77-kit; it has a javascript implementation for the client and php for the server but would this even make sensor for audio?

Does anybody have any experience with pressing audio on the client side (without using flash)

• javascript
• html
• audio
• pression
• client-side

Share Improve this question Follow edited Nov 15, 2012 at 17:52 Sami 8,42999 gold badges7171 silver badges103103 bronze badges asked Nov 15, 2012 at 13:45 ThomasThomas 1,71644 gold badges2424 silver badges4949 bronze badges

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Since you are using getUserMedia, I suppose that you want to record speech from a user's microphone.

Audio-specific pression algorithms should be much more efficient than general data pression algorithms. The downside of audio codes, such as MP3, are, that they are lossy.

Now, Speex might be a good codec for you. And as it happens, there is a full JavaScript Speex encoder/decoder, plete with example: speex.js.

Raw (or pressed) audio is very hard to press and I would highly suggest either writing a browser plugin that presses the audio or doing it server side. A general pression algorithm, zip, gz, etc. will not be able to give you any worthwhile amount of bandwidth savings.

I know I am answering quite late, here is my attempt at client side audio pression without using flash : https://github./Mido22/recordOpus,

I am sending the encoded opus packets to server(nodejs) using opus packets through socket, where I convert it to whatever format requested by user and provide him the link...

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