[Mp4-tech] Video Docs

[Raviprakash Nayak]

Hi,
Where can I get the documents related to Video codecs for MPEG 4?
I found for the Audio form 
http://www.m4if.org/resources.php with  ftp://ftp.tnt.uni-hannover.de/pub/MPEG/audio/   as Audio site.
But for the Video there are no doc provide, 
Please can any one tell me the location.
Regards,
Ravi Prakash Nayak U
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