[Mp4-tech] [System]Audio video sync

[Bharat P. SONI]

Hi,
For the time being I will answer your query no 3.
I also do not have the spec with me right now. I donät recall 
whether there is any restriction on the moov. But you can 
have multiple video in a presentation. These videos are 
identified by their their ES ids and in turn OD Id. The 
relation ship among various objects, like audio corresponding 
to a video may be defined in the BIFS. I am not sure if this 
relationship is described at the IOD level.
Regards,
Bharat