[M4IF Technotes] Standard conforming bitstream for Simple Vis ual Profile

[Jani Huoponen]

Hi Morten,
> Finally: if you 
> know of  a method to extract the profile information directly from a 
> compressed file, that would also be a great help.

If the files you are referring to include Visual Object Sequence header then
the first 32 bits in the stream present the Visual Object Sequence Start
Code and the next 8 bits will show you which Profile and Level was used.
That field is called profile_and_level_indication and the corresponding
codes are defined in the Annex G (Table G-1) of the Visual standard. For
instance, the bit sequence "0000 0001" refers to Simple Profile/Level 1.
BR, Jani
> Thanks
> 
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