[x264-devel] rbsp_alignment_zero_bit

[Ludrao]

Hi all,

I found h264 streams encoded with x264 that has a bizare sequence of trailing 
bits.

This is linked to section 7.3.2.11 of the standard:

7.3.2.11 RBSP trailing bits syntax
  rbsp_trailing_bits( ) {
    rbsp_stop_one_bit /* equal to 1 */
    while( !byte_aligned( ) )
    rbsp_alignment_zero_bit /* equal to 0 */
  }

This seems no always to be respected ?
For instance I found a stream where the last byte of the slice was 0x81.
The stream is using CABAC encoding.

I have done some checking, it happens to be the case in a lot of streams 
encoded with x264.

This is not really a big deals since I can just ignore the trailing bits, but 
still...

Maybe I am missing something in the spec ?

Regards,

Ludrao


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