Of itu-t sg16 wp3 and iso/iec jtc1/SC29/WG11

JCTVC-O0103 Intra-only SHVC rescaling [C. Fogg (Harmonic)]

The contributor withdrew the contribution.

JCTVC-O0253 On constraints of the Scalable Main profile [M. M. Hannuksela, K. Ugur (Nokia)]

The contribution includes two aspects related to the specification of the Scalable Main profile:

• 
  Profiles are indicated in the VPS extension syntax for each output layer set, not for the entire bitstream. Consequently, the constraints for profiles, such as the Scalable Main profile, are proposed to be written to concern output layer sets.
  
• 
  It is asserted that the constraint on avc_base_layer_flag appears to be true not only for the Scalable Main profile but to any bitstreams following the SHVC or MV-HEVC decoding process, because no mapping process of AVC motion fields has been specified. It is therefore proposed to move the constraint to Annex F.
  

It was remarked that we do not have a way to express a profile/tier/level constraint that applies to the whole bitstream – only to output layer sets, and this may be a problem.

A suggestion was to mandate that the bitstream include an output layer set that includes all layers in the entire bitstream. However, it was remarked that removal of the top layer of such a bitstream might create a non-conforming bitstream.

Decision (Ed.): Adopt first suggested change (no modification of constraint of avc_base_layer_flag).

Further study was requested on the issue of whole bitstream conformance.

No action was taken at this time on the 2nd item (basically a small editorial spec bug), since larger issues need to be resolved for this hybrid usage.