[Mp4-tech] mp4 and 3gp file data

[biplob das]

Hi,
I already made a .3gp audio file from .mp4 audio file by changing File type and extention.
Is it necessary to compress mp4 audio data to keep data in mdat atom of 3gp file? I compare 
mp4 and 3gp file data and I think it was compressed. Now I am confused about it's compression,
because is it necessary or not? Please help.
Regards.
Biplob 
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