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20th Meeting: by teleconference, October 2020 2020-10-08 01:54
AHG12: On signalling for high-bit depth
Authors: yoshitaka kidani KDDI K. Kawamura KDDI K. Unno KDDI
Abstract
This contribution proposes a signalling for high-bit depth video coding in VVC. In the previous meeting, JVET-S0243 presentation slide reported that coding gains of some tools are reduced or lost as QP decreases in high-bit depth video sequences. JCCR is one of the reported tools, and the verification effort can be reduced if JCCR is disabled in low QP range for high-bit depth coding. In this contribution, the additional applicable condition of JCCR with the pre-defined QP threshold is proposed against VVC ver.1. With this condition, JCCR can be disabled when block based QP is equal to or smaller than the pre-defined QP threshold. Simulation results under JVET-T0047 reportedly show the coding loss is negligible without one PQ test sequence (Market33Clip4000r2).
Meeting Notes
JVET-T0093 AHG12: On signalling for high-bit depth [Y. Kidani, K. Kawamura, K. Unno (KDDI)]

This contribution was discussed in JVET session 11 at 2205 on Monday 12 October (chaired by GJS & JRO).

This contribution proposes a signalling for high-bit depth video coding in VVC. In the previous meeting, JVET-S0243 presentation slides reported that coding gains of some tools are reduced or lost as QP decreases in high-bit depth video sequences. JCCR is one of the reported tools, and the verification effort can be reduced if JCCR is disabled in the low QP range for high-bit depth coding. In this contribution, the additional applicable condition of JCCR with the pre-defined QP threshold is proposed against VVC ver.1. With this condition, JCCR can be disabled when block based QP is equal to or smaller than the pre-defined QP threshold. Simulation results under JVET-T0047 reportedly show the coding loss is negligible without one PQ test sequence (Market33Clip4000r2).

It was noted that such a change would need to be conditioned on high bit depth (or something else that differs from version 1 usage).

It was also noted that losses were observed in some test results (Market3Clip4000r2).

The claimed benefit is reduced conformance testing for high bit depths. For high-bit-depth decoders that decode lower bit depth bitstreams, it would still need to implement the feature.

Another participant said that since this introduces new conditions, and since JCCR needs to be supported for lower bit depths, it might actually complicate conformance testing.

No action was taken on this.

References:
JVET-S0243 JVET-S2001 JVET-S2002 JVET-T0047
Cited:
JVET-T0012 JVET-T0107 X
ARCHIVE v3 :
JVET-T0093-v2.docx JVET-T0093.docx JVET-T0093.pptx JVET-T0093_used_JVET-T0047_sheet-v2.xlsm JVET-T0093_used_JVET-T0047_sheet.xlsm
Decisions
No action was taken on this.
Citation
20th Meeting: by teleconference, October 2020 2020-10-08 02:36
Crosscheck of JVET-T0093 (AHG12: On signalling for high-bit depth)
Authors: Takeshi Chujoh Sharp
Abstract
In JVET-T0093, a new additional applicable condition of JCCR for high bit-depth coding is proposed. The cross-checker reports that the source code provided by KDDI who proposes JVET-T0093 has been carefully analyzed and has been found to be consistent with the description in JVET-T0093. The cross checker could reproduce the results reported in JVET-T0093. The difference from measured encoder and decoder run time ratios to those reported in JVET-T0093 has been acceptable.
Meeting Notes
JVET-T0107 Crosscheck of JVET-T0093 (AHG12: On signalling for high-bit depth) [T. Chujoh (Sharp)] [late]

Golomb-Rice coding (4)

References:
JVET-T0047 JVET-T0093
PATENTS:
WO/2002/100267 0.34 3257042 0.33 20110118619 0.32 20110125046 0.31 20100076333 0.30 20190206360 0.28 WO/2017/200447 0.27 3459256 0.26
ARCHIVE v1 :
JVET-T0107-v1.docx JVET-T0107_Crosscheck_T0093.xlsm
Decisions
Golomb-Rice coding (4)
Citation
20th Meeting: by teleconference, October 2020 2021-01-09 23:24
Working practices using objective metrics for evaluation of video coding efficiency experiments (Draft 4)
Authors: K. Andersson F. Bossen Jens-Rainer Ohm Andrew Segall A. Sjöberg J. Ström Gary J. Sullivan Alexis Tourapis
Abstract
This document provides a description of Bjøntegaard delta bit rate (BD-rate) measurement practices for video coding experiments. It provides a concept-level overview of recent practices and provides references to technical papers that describe further details. It provides comments on why some of the choices were made and identifies situations where caution must be taken when interpreting the results. Revision marks are shown relative to the July 2020 output document, JVET-S2016-v1.
Meeting Notes
JVET-T2016 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] [WG 5 TR N 6] (2020-11-06)

WG 5 DoCR N 5.

JVET-T2016 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] [WG 5 TR N 6] (2020-11-06)

WG 5 DoCR N 5.

References:
JCTVC-G1200 JVET-H0030 JVET-M1004 JVET-O0003 JVET-P2011 JVET-Q0826 JVET-R2016 JVET-S2016
Cited:
JVET-U0001 JVET-U0002
ARCHIVE v2 :
JVET-T2016-v2.docx
Decisions
”
WG 5 DoCR N 5.
Citation
20th Meeting: by teleconference, October 2020 2020-10-31 12:47
Description of Exploration Experiments on NN-based video coding
Authors: E.Alshina S.Liu Wei Chen Yun Li Ru-Ling Liao Z. Ma H. Wang Elena Alshina
Abstract
This document describes Exploration Experiments (EEs) planned to be performed between JVET-T and JVET-U meetings in order to get better understanding of neural network-based video coding technologies, analyze and verify their performance and complexity aspects.
Meeting Notes
JVET-T2023 EE on Neural Network-based Video Coding [E. Alshina, S. Liu, W. Chen, Y. Li, R.-L. Liao, Z. Ma, H. Wang] [WG 5 [N 25] (2020-10-30) 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 Wednesday of the first week and closing it on the Wednesday of the second week of the SG 16 meeting – a total of 8 meeting days), and Otherwise meeting under ISO/IEC JTC 1/SC 29/WG 5 auspices when it meets (ordinarily starting meetings on the Friday prior to such meetings and closing it at lunchtime on the last day of the WG 5 meeting – a total of 7.5 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 b...
References:
JVET-O0101 JVET-T0057 JVET-T0069 JVET-T0079 JVET-T0088 JVET-T0094 JVET-T0125 JVET-T0128 JVET-T0130 JVET-T2006
Cited:
JVET-U0001 JVET-U0011 JVET-U0054 JVET-U0055 JVET-U0060 JVET-U0101 JVET-V0074
ARCHIVE v4 :
JVET-T2023_r3.docx JVET-T2023_r3_clean.docx ~$ET-T2023_r3_clean.docx
Decisions
_________________
Citation
20th Meeting: by teleconference, October 2020 2020-10-07 09:16
JVET AHG report: High bit depth, high bit rate, and high frame rate coding (AHG12)
Authors: A. Browne Tomohiro Ikai Xiaoyu Xiu Jens-Rainer Ohm
Abstract
This document summarizes the activity of AHG12: High bit depth, high bit rate, and high frame rate coding between the 19th meeting by teleconference (22 June - 1 July 2020) and the 20th meeting by teleconference (7 - 16 October 2020).
Meeting Notes
JVET-T0012 JVET AHG report: High bit depth, high bit rate, and high frame rate coding (AHG12) [A. Browne, T. Ikai, X. Xiu] This AHG report was reviewed in session 5 at 0500 UTC Thursday 8 October (chaired by GJS & JRO). This document summarizes the activity of AHG12: High bit depth, high bit rate, and high frame rate coding between the 19th meeting by teleconference (22 June – 1 July 2020) and the 20th meeting by teleconference (7–16 October 2020). In total there were 11 contributions noted to be related to high bit depth and one on high bit rate, but none related to high frame rate. The contributions are listed in the following section. Test conditions and sequences JVET-T0047, AHG12: Preliminary common test conditions for high bit depth video coding, T. Ikai, A.Browne, X. Xiu JVET-T0082, New HLG sequences for high bit-depth video coding, K. Kondo, M. Ikeda, A. Browne (Sony) Tools and t...
References:
JVET-T0047 JVET-T0072 JVET-T0082 JVET-T0084 JVET-T0085 JVET-T0086 JVET-T0087 JVET-T0089 JVET-T0091 JVET-T0093
ARCHIVE v2 :
JVET-T0012.docx JVET-T0012_v2.docx Spreadsheet_VTM10.0-EP1_vs_HM16.22-EP1.xlsm Spreadsheet_VTM10.0_vs_HM16.22.xlsm
Decisions
See JVET-T0111 providing information about lossless coding, which reports that HEVC SCC is outperforming VVC for intra coding in some cases.
Citation
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