[Libav-user] Parsing MPEG4 AVC video, Whats the hex starting bitstream of video NAL units

Robert Sitan lmodern at hotmail.com
Mon Apr 18 15:52:30 CEST 2011

Dear Amir,

> Every VCL NAL units start with a byte as header.
> 1-whats the bitstream of this one byte header of VCL NAL unit?

This is the first byte right after the start code prefix. It is described in section 7.3.1 of ITU-T Rec. H.264.

> We know also every NAL unit start with 3 byte which is named: Start Code Prefix.
> 2-Whatd the bitstream of start code prefix?

The SCP is defined in definition 3.146 of the above document. It consists of the 3-byte sequence 0x000001.

> The Access Unit start with some bytes as Access Unit Delimiter.
> 3-What is the bitstream of Access Unit Delimiter?

The AUD is a non-VCL NALU of type 9. Check table 7-1 for more details.



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