JVET-R0122 AHG9: On picture output for non-reference pictures [B. Choi, S. Wenger, S. Liu (Tencent)]

In this contribution, it is proposed that the pic_output_flag is not signalled in picture header and inferred to be equal to 1, when the value of non_reference_picture_flag is equal to 1. A coded picture with non_reference_picture_flag equal to 1 and pic_output_flag equal to 0 should not be included in the bitstream, becaue such a picture is never outputted and never used as a reference.

It was commented that, when a picture with pic_output_flag equal to 0 and Temporald less than the highest Temporald was referenced only by the highest temporal layer, and if that temproal layer is dropped, it becomes a "non-reference picture", although the "non-reference picture" flag is still equal to 0.

It was commented that the proposal would disallow a bitstream rewriter to mark a "non-reference picture" that has pic_output_flag equal to 1 to have pic_output_flag equal to 0 instead.

On the other hand, for that use case, the bitstream rewriter could set non_reference_picture_flag equal to 0 and set pic_output_flag equal to 0 for such a use case.

Decision (sensibility cleanup): Adopt. The NOTE needs to be rephased (delegated to the editor).

JVET-R2016 Summary information on BD-rate experiment evaluation practices [K. Andersson, F. Bossen, J.-R. Ohm, A. Segall, R. Sjöberg, J. Ström, G. J. Sullivan, A. Tourapis] (2020-05-15)

Minor refinements of the description were planned.

Future meeting plans, expressions of thanks, and closing of the meeting

Future meeting plans were established according to the following guidelines:

• Meeting under ITU-T SG 16 auspices when it meets (ordinarily starting meetings on the Tuesday of the first week and closing it on the Wednesday of the second week of the SG 16 meeting – a total of 9 meeting days), and
• Otherwise meeting under ISO/IEC JTC 1/SC 29/WG 11 auspices when it meets (ordinarily starting meetings on the Wednesday prior to such meetings and closing it at lunchtime on the last day of the WG 11 meeting – a total of 9.5 meeting days).

In cases where an exceptionally high workload is expected for a meeting, an earlier starting date may be defined.

Some specific future meeting plans (to be confirmed) were established as follows:

• Mon. 22 June – Wed. 1 July 2020, 19^th meeting under ITU-T auspices conducted by teleconference.
• Wed. 7 – Fri. 16 October 2020, 20^th meeting under WG 11 auspices in Rennes, FR.
• Wed. 6 – Fri. 15 January 2021, 21^st meeting under WG 11 auspices in Capetown, ZA.
• Tue. 20 – Wed. 28 April 2021, 22^nd meeting under ITU-T auspices in Geneva, CH.

The agreed document deadline for the 19^th JVET meeting was planned to be Wednesday 10 June 2020 (earlier than usual).

Vittorio Baroncini, Andrew Segall, Mathias Wien, and Yan Ye were thanked for their efforts in further...

JVET-R0465 Crosscheck of JVET-R0328 (AHG 10: ALF and CCALF encoder parallel design) [G. Li (Tencent)] [late]

Metrics and evaluation criteria (0)

No contributions on this topic were noted.

Plenary meetings, joint meetings, BoG reports, and summary of actions taken

High-level syntax / systems relation meeting

This previously planned coordination session was cancelled due to a lack of identified need.

Plenary meeting Sunday 19 April 1300-1500

Reports of the tracks were presented as follows:

The status of Tracks A and B was presented and discussed, which particularly included the following aspects:

Track A:

Status of HLS review:

By the end of April 18, 2020, the meetings had reviewed approximately 172 (70%) of the 254 contributions, which resulted in 65 recommendations/adoptions for normative action, 26 recommendations/adoptions for editorial action, and 25 revisits.

1. 6.1.1 Combinations of subpictures and other features (3/3): 1 recommendation, 2 revisits
2. (done) 6.1.2.1 Chroma deblocking t_c and β offsets signalling (13/13), 2 recommendations
3. 6.1.2.2 Deblocking control signalling - other aspects (4/5): 2 recommendations, 1 TBP
4. 6.1.2.3 Quantization control signalling (6/6): 1 adoption, 1 revisit
5. (assigned to 4/21 #3) 6.1.2.4 High-level control of features that use APSs: LMCS, scaling lists, and ALF (17/21): 12 recommendations/adoptions, 1 revisit, 4 TBP.
6. (assigned to 4/19 #3, 4/21 #3) 6.1.2.5 High level control of other tools (0/13): 13 TBP
7. 6.1.3 General and misc. HLS topics (6/9): 3 recommendations/adoptions, 3 revisits, 3 TBP
8. (assigned to 4/22 #1) 6.1.4 Profile, tier, level (PTL)...