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40th Meeting: Geneva, CH, October 2025 2025-10-04 14:24
EE2-5.1: On regularization of ALF-CCCM
Authors: Zhihuang Xie OPPO N. Song OPPO Luhang Xu OPPO Fan Wang OPPO Yue Yu OPPO H. Yu OPPO D. Wang OPPO
Abstract
This contribution reports the test results of EE2-5.1, which proposed to apply the regularization method used in EIP to the calculation of filter coefficients for ALF-CCCM. There are two sub-tests under EE2-5.1, where the EE2-5.1a tests the proposed method on top of ECM-18.0 and the EE2-5.1b tests the proposed method enabled in I slice as well. Simulation results are summarized as below:
Meeting Notes
JVET-AN0098 EE2-5.1: On regularization of ALF-CCCM [Z. Xie, N. Song, L. Xu, F. Wang, Y. Yu, H. Yu, D. Wang (OPPO)]

JVET-AN0098 Test 5.1a.

Cited:
JVET-AN0295 X
ARCHIVE :
EE2-5.1a_vs_ECM-18.0.xlsm EE2-5.1b_vs_ECM-18.0.xlsm JVET-AN0098-v2-clean.docx JVET-AN0098-v2.docx
Decisions
JVET-AN0098 EE2-5.1: On regularization of ALF-CCCM [Z. Xie, N. Song, L. Xu, F. Wang, Y. Yu, H. Yu, D. Wang (OPPO)]
JVET-AN0098 Test 5.1a.
Citation
40th Meeting: Geneva, CH, October 2025 2025-10-04 22:38
Crosscheck of JVET-AN0098 (EE2-5.1: On regularization of ALF-CCCM)
Authors: M. Jia ZTE
Abstract
This contribution is a crosscheck report of JVET-AN0098 [1], which reports the test results of EE2-5.1, which proposed to apply the regularization method used in EIP to the calculation of filter coefficients for ALF-CCCM.
Meeting Notes
JVET-AN0295 Crosscheck of JVET-AN0098 (EE2-5.1: On regularization of ALF-CCCM) [M. Jia (ZTE)] [late]
References:
JVET-AN0098
ARCHIVE :
ECM_TEST_5.1a.xlsm ECM_TEST_5.1b.xlsm JVET-AN0295.docx
Decisions
JVET-AN0295 Crosscheck of JVET-AN0098 (EE2-5.1: On regularization of ALF-CCCM) [M. Jia (ZTE)] [late]
Citation
41st Meeting: by teleconference, CH, January 2026 2026-01-14 05:35
JVET AHG report: ECM software development (AHG6)
Authors: Vadim Seregin Jie Chen Roman Chernyak F. Le Léannec Kai Zhang Jens-Rainer Ohm
Abstract
This report summarizes the activities of the AHG6 on ECM software development that has taken place between the 40th and 41st JVET meetings.
Meeting Notes
JVET-AO0006 JVET AHG report: ECM software development (AHG6) [V. Seregin (chair), J. Chen, R. Chernyak, F. Le Léannec, K. Zhang (vice-chairs)]
  1. Software development

ECM software repository is located at https://vcgit.hhi.fraunhofer.de/ecm/ECM.

ECM software is based on VTM-10.0 with enabled MCTF including the update from JVET-V0056, and GOP32, which is very close to VTM-11.0.

VTM-11.0ecm anchor https://vcgit.hhi.fraunhofer.de/ecm/ECM/-/tree/VTM11_ANC is used for ECM performance evaluation.

The following changes were integrated into ECM-19.0:

JVET-AN0168: Regression CCP fusion (Test 2.8a) [MR 962]

JVET-AN0101: Remove single model for ALF-CCCM (Test-5.3a) [MR 964]

JVET-AN0095: Quantization center shift (Test-4.2c*) [MR 965]

JVET-AN0121: split_cu_flag context change (Test 1.1g) [MR 968]

JVET-AN0098: Regularization for ALF-CCCM (Test 5.1a) [MR 967]

JVET-AN0093: Joint reordering GPM with affine and intra prediction (Test 3.4a) [MR 969]

JVET-AN0236: Generated merge candidates based on template cost (Test 3.1) [MR 966]

JVET-AN0203: Move RGPM to group 2 and add TM off implementation [MR 970]

JVET-AN0090: Adaptive subsampling filter selection for CCLM/intra-CCCM/ALF-CCCM (Test 2.6a) [MR 971]

JVET-AN0214: CABAC contexts retraining using ECM-18 data [MR 973]

JVET-AN0158: Longer tap interpolation filtering (Test 2.4) [MR 974]

Fixes:

Fix number of non zeroed-out coefficients to be encoded by RDOQ in LFNST/NSPT case [MR 960]

Collection of bugfixes [MR 961]

Bugfixes related to IBC and similar technologies [MR 963]

Fix JVET-AM0138 for 12 bit [MR 959]

Bugfix TIMD Intra merge [MR 958]

Fix...

ARCHIVE :
ECM-19.0_vs_ECM-18.0.xlsm ECM-19.0_vs_VTM-11.0ecm19.0.xlsm JVET-AO0006-v1.docx
Decisions
merged
The AHG recommended to: Continue to develop ECM software. Improve the software documentation. Encourage people to report all (potential) bugs that they are finding using GitLab Issues functionality https://vcgit.hhi.fraunhofer.de/ecm/ECM/-/issues. Encourage people to submit merge requests fixing identified bugs. Encourage people to continue working on ECM memory consumption reduction. Encourage people to continue working on speeding up ECM encoder to reduce the simulation time.
Citation
40th Meeting: Geneva, CH, October 2025 2025-10-23 10:39
Preliminary Announcement of JVET AHG17 Meeting in Aachen, DE, during 23-27 February 2026
Authors: Jens-Rainer Ohm Mathias Wien

Abstract not available in document

Meeting Notes
JVET-AN2041 Preliminary Announcement of JVET AHG17 Meeting in Aachen, DE, during 23-27 February 2026 The following 6 documents were produced as WG 5 documents only, without a corresponding JVET output document or direct repetition of their content in this meeting report: WG 5 N 373 Disposition of comments received on ISO/IEC 23002-7:2024/DAM 1 WG 5 N 374 Text of FDIS ISO/IEC 23002-7:202x (4th ed.) Versatile supplemental enhancement information messages for coded video bitstreams WG 5 N 375 Disposition of comments received on ISO/IEC 23008-2:2025/DAM 1 WG 5 N 376 Text of FDIS ISO/IEC 23008-2:202x (7th ed.) High efficiency video coding WG 5 N 377 Disposition of comments received on ISO/IEC 23090-3:2024/DAM 1 WG 5 N 378 Text of FDIS ISO/IEC 23090-3:202x (4th ed.) Versatile video coding For the organization and planning of its future work, the JVET established 19 “ad hoc groups” (AHGs) to pr...
ARCHIVE :
JVET-AN2041_v1.docx
Decisions
a) JVET documents
The meeting was closed at 1445 CET on 2025-10-12.
Citation
40th Meeting: Geneva, CH, October 2025 2025-10-04 22:46
EE2: Summary report of exploration experiment on enhanced compression beyond VVC capability
Authors: Vadim Seregin Döne Bugdayci Sansli Jie Chen Roman Chernyak Karam Naser J. Ström Fan Wang Martin Winken Xiaoyu Xiu Kai Zhang Jens-Rainer Ohm
Abstract
This document provides a summary report of Exploration Experiment on Enhanced Compression beyond VVC capability. The tests are categorized as partitioning, intra prediction, inter prediction, transform and coefficient coding, and in-loop filtering.
Meeting Notes
JVET-AN0024 EE2: Summary report of exploration experiment on enhanced compression beyond VVC capability [V. Seregin, D. Buğdayci Sansli, J. Chen, R. Chernyak, K. Naser, J. Ström, F. Wang, M. Winken, X. Xiu, K. Zhang (EE coordinators)] Tests Tester Cross-checker 1 Partitioning 1.1a Restrictions for TT splitting (normative way) with split_cu_flag context change G.Wang (vivo) Z.Deng(Bytedance) Y.Liu(Transsion) Z.Sun(OPPO) 1.1b Restrictions for TT splitting (non-normative way) G.Wang (vivo) Z.Deng(Bytedance) Z.Sun(OPPO) 1.1c Temporal partitioning prediction optimization G.Wang (vivo) Z.Sun(OPPO) 1.1d Test 1.1a + Test 1.1c G.Wang (vivo) withdraw 1.1e Test 1.1b + Test 1.1c G.Wang (vivo) withdraw 1.1f Restrictions for TT splitting (normative way) G.Wang (vivo) Y.Liu(Transsion) 1.1g split_cu_flag context change G.Wang (vivo) Y.Liu(Transsion) 2 Intra prediction 2.1 TMRL blend S. Blasi (Nokia) V....
ARCHIVE :
JVET-AN0024-v1.docx JVET-AN0024_Tests_summary-v1.xlsx
Decisions
adopted
Adopt JVET-AN0101 Test 5.3a
Citation
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