| JCTVC-M0046 High-level syntax modifications for SHVC [J. Boyce, D. Hong, W. Jang (Vidyo)]
Discussed in BoG; see BoG report M0450.
JCTVC-M0164 Layer identifier extension [B. Choi, Y. Cho, M. W. Park, J. Y. Lee, J. Yoon, H. Wey, C. Kim (Samsung)]
Discussed in BoG; see BoG report M0450.
6.4.2High-level syntax issues of joint interest with JCT-3V (?)
JCTVC-M0201 MV-HEVC/SHVC HLS: On access unit definition [M. M. Hannuksela (Nokia)]
It is suggested that, in the draft MV-HEVC and SHVC specifications, an access unit seems to be intended to be defined to contain one coded picture (with a particular value of nuh_layer_id) – although it is not clear that this was consciously decided by the JCT-VC. Another approach is to define an access unit to contain all pictures with the same POC value (and with any value of nuh_layer_id). This contribution compares the two approaches and asserts that the current access unit definition in MV-HEVC and SHVC is the better one in several ways: i) in terms of the number of specification text changes in HEVC version 1, ii) for HRD operation, and iii) for providing encoders flexibility in standards scalability and in determination of layer-specific prediction structures. The contribution advocates to retain (and clarify as necessary) that access unit definition of the current draft MV-HEVC and SHVC specifications.
It was asked whether we want to allow mixing of NAL units of different layers/views with the same POC. M0204 considers this. Disallowing this might have an impact on ultra-low-delay applications.
The HRD operation definition for CPB and DPB are affected (fullness fluctuation, temporary storage, etc.).
The possibility of different view component ordering characteristics (different "GOP" structures) in different layers was discussed. This seems like it could only be done if each view component is treated as a different "picture" / "access unit". This could affect cross-standards compatibility and coding efficiency (a relevant prior contribution was L0171).
M0204 was noted to be closely related.
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