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18th Meeting: Teleconference, April 2020 2020-04-21 06:22
AHG9/AHG15: Chroma QP mapping table cleanups
Authors: Jizheng Xu ByteDance Li Zhang ByteDance Ye-Kui Wang ByteDance Kai Zhang ByteDance Zhipin Deng ByteDance
Abstract
This contribution proposes the following HLS changes to chroma QP mapping tables:
Meeting Notes
JVET-R0076 AHG9: Chroma QP mapping table cleanups [J. Xu, L. Zhang, Y.-K. Wang, K. Zhang, Z. Deng (Bytedance)]

This contribution proposes the following HLS changes to chroma QP mapping tables:

  1. Change qp_table_start_minus26 to qp_table_start and update the semantics accordingly.

This would allow the table to start in the negative range, but the proponent said there would be no desire to have an offset in this range. The coding of this would be unsigned rather than signed as currently.

This table is sent in the SPS.

There seemed to be no need for action on this.

  1. Change num_points_in_qp_table_minus1 to num_points_in_qp_table and update the semantics accordingly. num_points_in_qp_table equal to 0 indicates that for each QpY QpChroma is equal to QpY.

There is no shortcut for an identity mapping. The way to signal that is to send 0 for the val_minus1 and 1 for the diff_val. This is done in the VTM (there had been a bug in this, which has been fixed). The proponent said this is not very intuitive and would prefer that if no pivot points are sent, an identity mapping is inferred.

It was commented that similar proposals had previously been discussed with no action taken, and that it was undesirable to add more special cases, and that the reference software can help inform people of what to do, so no action was taken on this.

  1. Use separate chroma QP mapping tables for I slices and B/P slices.

Currently, our CTC uses different tables for AI versus RA/LB/LP. They are not very different, and it was commented that these had probably not really been optimized. This may have been to try to...

References:
JVET-Q2001
Cited:
JVET-R0015 JVET-R0481 JVET-R0489 X
PATENTS:
20170339409 0.34 20020104891 0.33 20140140406 0.32 20230370646 0.31 WO/2022/072884 0.30 4222969 0.28 20260004402 0.27 7095783 0.26
ARCHIVE v3 :
._JVET-R0076-(29,30)(29,31).xlsm ._JVET-R0076-EQP.xlsm ._JVET-R0076-setting1.xlsm ._JVET-R0076-setting2.xlsm ._JVET-R0076-v2.docx ._JVET-R0076-v2.pptx ._JVET-R0076-v3.docx ._JVET-R0076.docx JVET-R0076-(29,30)(29,31).xlsm JVET-R0076-EQP.xlsm JVET-R0076-setting1.xlsm JVET-R0076-setting2.xlsm JVET-R0076-v2.docx JVET-R0076-v2.pptx JVET-R0076-v3.docx JVET-R0076.docx
Decisions
It was commented that we should check the luma/chroma balance used in the CTC and consider using offsets to adjust that.
Citation
18th Meeting: Teleconference, April 2020 2020-04-24 07:19
Cross-check of JVET-R0076 (AHG9/AHG15: Chroma QP mapping table cleanups)
Authors: Adarsh Krishnan Ramasubramonian Qualcomm
Abstract
This document provides a partial cross-check of the results presented in Section 2.4 of JVET-R0076-v3. The cross-check covers the proposal to modify the chroma QP mapping table specified for the AI, RA and LDB common test conditions. For simulations that are completed, it is reported that the results of the cross-checker match that of the authors provided in Section 2.4 of JVET-R0076-v3 and corresponding Excel files (excluding some negligible differences due to rounding in the RA configuration).
Meeting Notes
JVET-R0489 Cross-check of JVET-R0076 (AHG9/AHG15: Chroma QP mapping table cleanups) [A. K. Ramasubramonian (Qualcomm)] [late]
JVET-R0272 AHG9: On chroma QP offsets in picture header [K. Misra, J. Samuelsson, S. Deshpande, F. Bossen, A. Segall (Sharp)]

See the notes above for JVET-R0073.

References:
JVET-R0076
PATENTS:
3162066 0.34 20160353113 0.33 2016271130 0.32 20160353111 0.31 3304916 0.30 2016271137 0.28 20160353112 0.27 2016271140 0.26
ARCHIVE v1 :
JVET-R0489-xCheck-of-JVET-R0076-setting1.xlsm JVET-R0489-xCheck-of-JVET-R0076-setting2.xlsm JVET-R0489.docx
Decisions
JVET-R0489 Cross-check of JVET-R0076 (AHG9/AHG15: Chroma QP mapping table cleanups) [A. K. Ramasubramonian (Qualcomm)] [late]
Citation
18th Meeting: Teleconference, April 2020 2020-05-17 19:13
Summary information on BD-rate experiment evaluation practices
Authors: K. Andersson F. Bossen Jens-Rainer Ohm Andrew Segall Rickard Sjöberg J. Ström Gary J. Sullivan Alexis Tourapis
Abstract
This document provides general summary information about typical quality measurement practices for video coding experiments in recent work in MPEG and VCEG and their JVET and JCT-VC joint teams. In particular, it describes the use of Bjøntegaard Delta rate (BD-rate) measurements. It aims at providing a concept-level overview of recent practices and to provide some references to technical papers that describe further details. It provides comments on why some of the choices were made and points at situations where caution must be taken when interpreting the results. Revision marks are shown relative to the January 2020 output document, JVET-Q2016-v4.
Meeting Notes
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, 19th meeting under ITU-T auspices conducted by teleconference.
  • Wed. 7 – Fri. 16 October 2020, 20th meeting under WG 11 auspices in Rennes, FR.
  • Wed. 6 – Fri. 15 January 2021, 21st meeting under WG 11 auspices in Capetown, ZA.
  • Tue. 20 – Wed. 28 April 2021, 22nd meeting under ITU-T auspices in Geneva, CH.

The agreed document deadline for the 19th 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...

References:
JCTVC-G1200 JVET-H0030 JVET-M1004 JVET-O0003 JVET-P2011 JVET-Q2016
Cited:
JVET-AA0130 JVET-AA2018 JVET-S0001 JVET-S2016 JVET-T2016 JVET-U2018
ARCHIVE v1 :
JVET-R2016-v1.docx
Decisions
”
Tianyang Zhou (Sharp)
Citation
18th Meeting: Teleconference, April 2020 2020-04-17 10:01
JVET AHG report: Quantization control (AHG15)
Authors: Roman Chernyak Edouard François Christian Helmrich Sean McCarthy Andrew Segall Jens-Rainer Ohm
Abstract
This document summarizes the activity of AHG15: Quantization control between the 17th meeting in Brussels, BE (7-17 Jan 2020) and the 18th Meeting (teleconference, 15-24 April 2020).
Meeting Notes
JVET-R0015 JVET AHG report: Quantization control (AHG15) [R. Chernyak, E. François, C. Helmrich, S. McCarthy, A. Segall] This document summarizes the activity of AHG15: Quantization control between the 17th meeting in Brussels, BE (7–17 Jan 2020) and the 18th Meeting (teleconference, 15-24 April 2020). The regular JVET e-mail reflector was used for discussions (jvet@lists.rwth-aachen.de) with [AHG15] in message headers. There were no emails besides AHG kickoff message sent to the JVET reflector during the AHG period. Category 1 AHG pre-meeting of the 18th JVET meeting The following AHG15 related contributions were identified as related to Quantization control signalling section of Category 1 AHG pre-meeting. Notes from the Category 1 pre-meeting are available in JVET-R0339. JVET-R0050, AHG9: HLS on dependent quantization and sign data hiding, S.-T. Hsiang, T.-D. Chuang, Y.-W. Huang, S.-M...
References:
JVET-R0045 JVET-R0050 JVET-R0055 JVET-R0068 JVET-R0073 JVET-R0076 JVET-R0127 JVET-R0166 JVET-R0272 JVET-R0302 JVET-R0326 JVET-R0339 JVET-R0340 JVET-R0370 JVET-R0380
ARCHIVE v3 :
JVET-R0015-v3.docx
Decisions
Using adaptive rate control for QP signalling experiments was suggested in the discussion.
Citation
18th Meeting: Teleconference, April 2020 2020-04-17 06:57
JVET AHG report: Test model software development (AHG3)
Authors: F. Bossen Xinwei Li Karsten Sühring Jens-Rainer Ohm
Abstract
This report summarises the activities of the AhG3 on Test model software development that has taken place between the 17th and 18th JVET meetings.
Meeting Notes
JVET-R0003 JVET AHG report: Test model software development (AHG3) [F. Bossen, X. Li, K. Sühring] This report summarizes the activities of the AhG3 on Test model software development that has taken place between the 17th and 18th JVET meetings. VTM software development VTM 7.2 was tagged on Jan. 17, 2020. VTM 7.3 was tagged on Jan. 20, 2020. After one release candidate, VTM 8.0 was tagged on Feb. 22, 2020. VTM 8.1 was tagged during the 18th JVET meeting. The following tables show VTM 8.0 performance over HM 16.20: All Intra Over HM-16.20 Y U V EncT DecT Class A1 -27.89% -39.05% -39.30% 1865% 221% Class A2 -27.49% -29.04% -26.48% 2997% 238% Class B -20.99% -32.87% -37.24% 3361% 227% Class C -21.74% -25.20% -28.82% 4692% 224% Class E -25.16% -31.46% -30.65% 2667% 206% Overall -24.09% -31.32% -32.82% 3097% 224% Class D -17.64% -19.95% -20.14% 5303% 217% Class F -38.68% -43.85% -46.26% 5898%...
References:
JVET-O1143 JVET-O1159 JVET-P0097 JVET-P0115 JVET-P0116 JVET-P0117 JVET-P0118 JVET-P0124 JVET-P0125 JVET-P0126 JVET-P0135 JVET-P0171 JVET-P0181 JVET-P0182 JVET-P0184 JVET-P0185 JVET-P0188 JVET-P0190 JVET-P0218 JVET-P0257 JVET-P0337 JVET-P0359 JVET-P0446 JVET-P0450 JVET-P0462 JVET-P0478 JVET-P0590 JVET-P0592 JVET-P0597 JVET-P0894 JVET-P0978 JVET-P0984 JVET-P1004 JVET-P1024 JVET-P1038 JVET-P2001 JVET-Q0044 JVET-Q0054 JVET-Q0110 JVET-Q0112 JVET-Q0113 JVET-Q0114 JVET-Q0115 JVET-Q0117 JVET-Q0118 JVET-Q0119 JVET-Q0121 JVET-Q0147 JVET-Q0150 JVET-Q0151 JVET-Q0154 JVET-Q0156 JVET-Q0157 JVET-Q0164 JVET-Q0169 JVET-Q0183 JVET-Q0200 JVET-Q0203 JVET-Q0210 JVET-Q0216 JVET-Q0217 JVET-Q0218 JVET-Q0219 JVET-Q0221 JVET-Q0222 JVET-Q0237 JVET-Q0244 JVET-Q0246 JVET-Q0247 JVET-Q0249 JVET-Q0257 JVET-Q0259 JVET-Q0260 JVET-Q0265 JVET-Q0270 JVET-Q0271 JVET-Q0277 JVET-Q0280 JVET-Q0289 JVET-Q0317 JVET-Q0343 JVET-Q0346 JVET-Q0355 JVET-Q0358 JVET-Q0359 JVET-Q0379 JVET-Q0395 JVET-Q0397 JVET-Q0398 JVET-Q0399 JVET-Q0400 JVET-Q0402 JVET-Q0404 JVET-Q0406 JVET-Q0414 JVET-Q0416 JVET-Q0420 JVET-Q0433 JVET-Q0436 JVET-Q0438 JVET-Q0443 JVET-Q0444 JVET-Q0446 JVET-Q0447 JVET-Q0449 JVET-Q0468 JVET-Q0471 JVET-Q0493 JVET-Q0495 JVET-Q0501 JVET-Q0503 JVET-Q0512 JVET-Q0516 JVET-Q0517 JVET-Q0629 JVET-Q0630 JVET-Q0695 JVET-Q0712 JVET-Q0751 JVET-Q0764 JVET-Q0775 JVET-Q0781 JVET-Q0786 JVET-Q0787 JVET-Q0795 JVET-Q0798 JVET-Q0806 JVET-Q0814 JVET-Q0819 JVET-Q0820 JVET-Q2014
ARCHIVE v1 :
JVET-R0003-hm-16.20_vs_vtm-8.0.xlsm JVET-R0003-vtm-7.0_vs_vtm-8.0.xlsm JVET-R0003.docx
Decisions
noted
In the meeting discussion it was noted that CCALF had substantially changed the balance of luma and chroma fidelity. It was commented that this is discussed in JVET-R0076. The QP mapping table or an overall offset can be used to adjust this. Reducing lambda for luma and increasing it for chroma would also be a possibility. See further notes for the Friday 24 April plenary.
Citation
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