[Mp4-tech] [H.264] Redundant Slices in JM10.2

[Karsten Suehring]

Alex,
the JM decoder will ignore any redundant pictures. But the encoder code
for redundant pictures is broken and will result in invalid bitstreams.
Best regards,
Karsten
Alex Converse wrote:
> Dear experts,
> 
> Sorry if this is a duplicate message my list confirmation came in later
> than I expected.
> 
> Using the JM110.2 reference software encoding and decoding a baseline
> stream using the following commands:
> 
> $ ./lencod.exe -d encoder_baseline.cfg
> $ ./ldecod.exe
> 
> encodes and decodes a stream properly.
> 
> Trying again with redundant slices, using the following commands:
> 
> $ ./lencod.exe -d encoder_baseline.cfg -p UseRedundantSlice=1
> $ ./ldecod.exe
> 
> gives me a "mb_qp_delta is out of range" error on the decoding process
> before finishing the first frame. Is this the expected behavior? Am I
> misusing the encoder or decoder? I know redundant slices exist largely
> for helping decoders decode non-conformant streams but if the stream is
> otherwise conformant shouldn't it decode properly?
> 
> Thanks,
> Alex Converse
> 
> 
> _______________________________________________
> NOTE: Please use clear subject lines for your posts. Include [audio,
> [video], [systems], [general] or another apppropriate identifier to
> indicate the type of question you have.
> 
> Note: Conduct on the mailing list is subject to the Antitrust guidelines
> found at
> http://www.mpegif.org/public/documents/vault/mp-out-30042-Antitrust.php