The Joint Collaborative Team on Video Coding (jct-vc) of itu-t wp3/16 and iso/iec jtc 1/ sc 29/ wg 11 held its tenth meeting during 11-20 July 2012 at the City Conference Centre (ccc), a k. a

5.12.6.3Multi-topic high-level syntax documents (1 – done)

JCTVC-J0290 High layer syntax issues [C. Fogg (Harmonic), A. Wells (Ambarella)]

The contribution discussed four topics:

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  Perhaps as a result of the previous JCT editing sessions on RAP types, the current HEVC specification draft does not include a method to signal end of stream as provided in AVC. In discussion, it was commented that the same is true for end of CVS. Decision: Add a NUT for each as in AVC.
  
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  MaxDPBSize for field sequences should be twice as a large as the default HEVC frame sequences. This aspect is covered in other contributions – see notes elsewhere.
  
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  When duplicate_flag=1, the contribution suggests that it not be necessary for more than one tile or parallel partition to be included in the bitstream. This aspect does not affect the current draft, as there is no current mandatory partitioning, so no action is needed – although it may be desirable to keep this in mind in the future.
  
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  DPB output behaviour may benefit from a defined output behavior during transitions between field and frame sequences. See notes relating to J0107 – this aspect may benefit from editorial improvement, but no normative action was planned. Decision (Ed.): Editor action item.
  
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  Further clarification in the specification between the different RAP types is also desired. This was an editorial request and the improvement of clarity task was delegated to the editors. Decision (Ed.): Editor action item.
  
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  In a revision of the contribution, it was suggested to consider establishing a limit on the number of pictures in the reference picture list(s) that may be smaller than the limit on the DPB capacity (e.g. MaxDpbSize). This aspect does not affect the current draft, as the current DPB capacity limit is already relatively low, so no action is needed – although it may be desirable to keep this in mind in the future. If the DPB capacity limit is raised, a suggested limit would 5 reference pictures in the lists.
  
• 
  The contribution suggested requiring restricted_ref_pic_lists_flag to be equal to 1 in field sequences. A suggested alternative was to constraint the maximum number of slices per two fields to be the same as the maximum number of slices per frame. This aspect does not affect the current draft, as the current draft does not support field at twice the picture rate of frames, so no action is needed – although it may be desirable to keep this in mind in the future.
  

Decision (Ed.): The standard should include a requirement for the bitstream to obey the restricted_ref_pic_lists_flag, and a requirement for reference picture list 0 to be the same in both B and P slices.

It was noted that the current (I1003 d7) draft does not refer to the SliceRate variable, but should (editorial). Decision (Ed.): Editor action item.