| JCTVC-J0453 Cross-verification of JCTVC-J0208 : Bypass bins grouping on Intra mode coding [W.-J. Chien (Qualcomm)] [late]
Cross-checkers support the idea, as it is consistent with things that are done elsewhere.
JCTVC-J0279 CU skip and split CABAC context modification for flexible wavefront parallel parsing [M. Coban, W.-J. Chien, M. Karczewicz (Qualcomm)]
This contribution proposes removal of CU skip and split CABAC dependency on the upper CTB row for enabling parallel parsing of wavefront substreams with CTB row level synchronization instead of more restrictive CTB level synchronization. It is reported that the proposed context modeling CU skip and split flag results in 0.02%, 0.05%, 0.09% BD-rate loss for AI-Main, RA-Main, LD-Main configurations, respectively, and 0.02%, 0.06%, 0.14% BD-rate loss for AI-HE10, RA-HE10, LD-HE10 configurations, respectively.
Presentation not uploaded.
Loss is higher (0.3–0.4%) for smaller CTB such as 16x16, but negligible as compared to the overall loss that small CTB has.
Several experts support the idea.
Current text does not seem to be complete (missing precise definition of “availability”) – was resolved according to draft editor.
One expert mentions that the same proposal has been presented before (e.g. Torino), and was not adopted because it causes loss in class E (which is still the case)
No consensus reached to take action on this.
JCTVC-J0414 Crosscheck of CU skip and split CABAC context modification for flexible wavefront parallel parsing in JCTVC-J0279 [C.-W. Hsu, Y.-W. Huang (MediaTek)] [late]
Confirms that the results are correct and the dependency is removed.
When asked for confirmation about the matching of software and text, the cross-checker was no longer in the room.
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