[M4IF Technotes] MP4 file format description?

[Saurabh Mishra]

hi 
Where can I find a detailed description of  the MP4 file format?can someone tell me that What is in the header information in mp4 file format? 
    how many bytes header is there in mp4 file?? if possible,How we can we extract the header information from that? 
thanx in advance,
Saurabh
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