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Q: 

3gp File format question

Hi ,

I have a doubt regarding 3gp/mp4 file format.

Is it possible to have multiple audio/video tracks within a same file encoded with different codec.

e.g one amr audio track and one aac audio track.

 one h264 video track and one h263 video track.

User can choose which audio /video combination it want to play.

Regards nitin

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