[Mp4-tech] Mp4/M4a/WMA header format

[Magda Barros]

  Hi,
 With Mp3 files, through parser in ID3v1, ID3v2... I get informations:
title,artist,album,comment,year,genre ...
1. In the case of MP4 and M4a files, as I can to get these information?
2. How to make parser in these two kind of files(header)?
3. Somebody has some document with the specification of the format of these
formats?
4. I want to consider Mp4 archives that contain only information of audio.
How to know that if the MP4 contains video, audio?
   So, could me one of you help me?
  Thanks,
   Magda.*
 *
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