JCTVC-J0465 AHG9: Mental cross-check of JCTVC-J0306 [Y.-K. Wang (Qualcomm)] [late]
JCTVC-J0569 Sub-picture Based CPB Removal Timing [S. Deshpande (Sharp), K. Kazui (Fujitsu)] [late]
5.12.8.2Other HRD aspects (3 – done)
JCTVC-J0137 AHG9: New high-level syntax for simple HEVC stream editing [K Kazui, J Koyama, S Shimada, A Nakagawa (Fujitsu)]
This contribution proposes changes of high-level syntax relating to simple HEVC streaming editing.
The proposed changes are 1) adding alternative parameters of cpb_removal_delay and dpb_output_delay for TFD picture removal, 2) adding specification of an SEI message for indicating editing point, and 3) defining a parameter indicating continuity of bitstream at BLA picture.
Cross-checked in J0476 (the author of which was not available for the discussion).
It was commented that this has a relationship to J0444.
In discussing the proposed SEI message, it was questioned whether we need to support the envisioned operation where a bitstream is chopped at an arbitrary position in decoding order without regard to the consequences of this action.
It was suggested that the proposed functionality could be addressed by metadata definition after finalization of version 1.
For the first two aspects, further study was recommended.
Regarding the third aspect, it was noted that HRD continuity can be maintained, in principle, even when picture size and bit rate change – which is not supported in this proposal. It was also remarked that the end of bitstream NAL unit can be sent as an indication of HRD discontinuity. This aspect may therefore not be necessary. If there is a need for clarification, that can be considered (editorial only). It was suggested that the equivalent text that appears in the end of stream RBSP semantics in AVC (subclause 7.4.2.6) should be identified as normative text in HEVC. Decision (Ed.): Agreed.
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