[M4IF Technotes] What is binary_arithmetic_code()?

[Herbert Thoma]

> Li Zhengming schrieb:
> 
> [Image]
> 
> Hello everyone!
> 
> I am a stranger to Mpeg4 standard. Now I wonder what is binary_arithmetic_code() in the Mpeg4 video stream syntax?
> 
> Does it has any representation in the actual bits stream, or does it only indicate a way to decode the stream and get the babs and macroblocks?

The binary_arithmetic_code() represents the shape of a macroblock (which pixels of the macroblock
belong to the object or not). It is only present if you use shape coding (arbitrily shaped,
non-rectangular VOPs). Section 7.5 of the MPEG-4 Visual standard describes how to decode
these bits.
 Herbert.
> I have read the standard spec for several times and is still puzzled by this question now. Thank you in advance!
> 
> Li Zhengming
> 
> ÀîÕùÃ÷
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-- 
Herbert Thoma
FhG-IIS A, Studio Department
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