[Mp4-tech] H.264 start code scenarios

[Girish]

Dear shanmugavel,
Please find the answers below..
Hi,
Start code can be any no. of consecutive zeros(atleast 2) followed by 1.
Reason:
If there is 3 consecutive 0s means you have to skip first 0.
So 00 00 00 => 00 00 only
now you consider these start codes
00 00 00 01 => skip first 0 as 3 consecutive 0s are there. so it will become
00 00 01.
similarly you can check 00 00 00 00 00 01 this is also start code.
I think this will clear your doubt.
Regards,
Sanjay
Quoting shanmugavel.balasubramanian wipro.com:
> 
> Hi All,
>  
> I have seen some of the H.264 encoded streams having a start code
> of length 3 and some with 4.
> 1. why is it that " number of preceding zeros is two in some cases
> and 3 in some cases". 
> 2. does the number difference for start code length have any
> significance. Can the length of start code change from NAL to NAL
> in a sequence. 
>  
>  
> Best Regards,
> Velu
>  
> 
>  
> 
> 
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