3.6.2SHVC profiles (3)
Discussed Fri 1st am (GJS).TBP.
Decision: Scalable Main bitstreams shall have a base layer that is Main profile and enhancement layers shall be 4:2:0 8b.
JCTVC-O0093 AHG9: On inter layer dependency [Y. He, Y. Ye, X. Xiu, Y. He (InterDigital)]
Part 1 of this wais in this category. Also noted elsewhere. However, the contributor withdrew that aspect.
JCTVC-O0094 AHG9: On SHVC main profile constraint [Y. He, Y. Ye, X. Xiu, Y. He (InterDigital)]
This contribution proposes two constraints for the SHVC main profile: (1) to restrict the total number of dependent layers, including direct dependent and indirect dependent layers, that can be used for inter-layer prediction for SHVC so as to limit the decoder complexity; (2) to require the base layer with TemporalID equal to 0 to be the dependent layer, direct or indirect, for all the enhancement layers so as to fulfill the conformance requirement of sub-bitstream extraction process.
The concept of limiting direct and indirect dependencies was agreed to be valuable. It was suggested that this be a matter of level definition rather than a profile constraint. However, another participant suggested that some constraint be established as a matter of profile specification.
Decision: Limit direct and indirect dependencies to 8 as a profile constraint.
Regarding the lack of base layer in the simulcast case, it was suggested that although we do not have a sub-bitstream extraction process to extract an independent non-base layer, this may be simply a non-normative ("re-writing") functionality that is envisioned but does not need to be specified.
It was suggested to consider providing an informative subclause to describe a method of enabling and performing re-writing.
It was suggested that if we care about rewriting, we might need to think about our parameter set syntax, due to modifications that precede the extension flag.
Further study of this was suggested.
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