[Mp4-tech] H.264 start code scenarios

[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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