Ben,

I found some Java code that can parse an mp4 or 3gp file. I am using
it to extract an AMR audio stream from the file.

https://contributions.coremedia.com/isobox4j/wiki/IsoParser

Look at IsoFile.getTrack to get the raw AMR samples and then stick an
AMR header on the front of the data.

3gp is a media container file format. It is a simplified version of
the mp4 media container file format. The AMR is just a sample stream
within the 3gp or mp4 container file.

Warwick

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