JVET-AP0001 JVET AHG report: Project Management (AHG1) [J.-R. Ohm (chair), G. J. Sullivan (vice chair)]
The reflector used for discussions by the JVET and all of its AHGs is the JVET reflector:
jvet@lists.rwth-aachen.de. For subscription to this list, see
https://lists.rwth-aachen.de/postorius/lists/jvet.lists.rwth-aachen.de/.
The number of subscribers (on the day before the beginning of the current meeting) was 1389 (compared to 1384 by the time of the previous meeting). Furthermore, the previous lists of joint teams (which were still kept open as archives) had the following number of subscribers:
- JCT-VC – 1162 subscribers
- JCT-3V – 680 subscribers
- JVT-experts – 2082 subscribers
It is likely that many subscriptions of these latter three reflectors would have become obsolete, as no emails are being sent over them any more, and therefore automatic removal of addresses causing permanent bounces by being invalid (as it happens with the main JVET reflector) cannot be executed by the reflector management system.
- Goals and activity
The work of the JVET overall had proceeded well in the interim period with increased number of input documents (as compared to the previous meeting) submitted to the current meeting. Intense discussion had been carried out on the group email reflector, and output documents from the preceding meeting had been produced as planned.
Output documents from the preceding meeting had been made initially available at the JVET web site (https://jvet-experts.org/) or the ITU-based JVET ftp site (http://wftp3.itu.int/av-arch/jvet-site/2026_01_AO_Virtual/). JCT-VC and JCT-3V documents can also be accessed directly via the JVET site. Previous meeting documents of JVT, JCT-VC, JCT-3V and JVET are also available from the ITU-based ftp site, where sub-folders of the different groups can be found under https://www.itu.int/wftp3/av-arch/, and sub-folders ‘./documents/’ were created in the folders of the respective meetings (it is noted that, for practicality reasons, for JVET this is only done after all meeting documents including output documents are completely available in all versions, such that there may be some delay in availability). All those files come with the original time stamps by which the original versions of documents were uploaded.
The list of output documents produced since the last meeting included the following:
- JVET-AO1004 Errata report items for VVC, VSEI, HEVC, AVC, and Video CICP [Posted 2026-02-27]
- JVET-AO1016 AVC with extensions and corrections (Draft 5) [Posted 2026-04-24]
- JVET-AO1017 Support for additional VSEI messages in AVC (Draft 5) [Posted 2026-03-16]
- JVET-AO2002 Algorithm description for Versatile Video Coding and Test Model 23 (VTM 23) [Posted 2026-03-06]
- JVET-AO2011 VTM and HM common test conditions and evaluation procedures for HDR/WCG video [Posted 2026-01-30]
- JVET-AO2019 Description of algorithms version 14 and software version 16 in neural network-based video coding (NNVC) [Posted 2026-04-20]
- JVET-AO2021 Verification test plan for VVC multilayer coding (update 8) [Posted 2026-02-05, last update 2026-03-03]
- JVET-AO2023 Exploration experiment on neural network-based video coding (EE1) [Posted 2026-01-22, last update 2026-02-10]
- JVET-AO2024 Exploration experiment on enhanced compression beyond VVC capability (EE2) [Posted 2026-01-23, last update 2026-01-30]
- JVET-AO2026 Draft Joint Call for Proposals on video compression with capability beyond VVC, also issued as WG 5 N 388 [Posted 2026-02-05]
- JVET-AO2027 Common Test Conditions (CTC) for gaming applications [Posted 2026-01-23, last update 2026-01-29]
- JVET-AO2030 Optimization of encoders and receiving systems for machine analysis of coded video content (Draft 10), also issued as WG 5 2nd DTR N 387 [Posted 2026-02-06]
- JVET-AO2032 Technologies under consideration for future extensions of VSEI (version 11) [Posted 2026-03-13, last update 2026-04-13]
- JVET-AO2040 Complexity reporting template for coding algorithms and tools [Posted 2026-02-14, last update 2026-02-27]
- JVET-AO2041 Announcement of JVET AHG17 Meeting in Aachen, DE, 25-27 February 2026 [Posted 2026-02-05]
The eighteen ad hoc groups had made progress, and reports from those activities had been submitted. A report from the Joint AHG on Gaussian splat coding (together with WG 4 and WG 7) is expected during the meeting. Numerous teleconferences had been held by AHGs. Furthermore, two exploration experiments (EE) on neural network-based video coding and on enhanced compression beyond VVC capability, as well as a joint EE on Gaussian splat coding (under the JAHG) were conducted.
The arrangements for the 42nd meeting had been announced in the JVET reflector, in the JVET logistics document https://www.itu.int/wftp3/av-arch/jvet-site/2026_04_AP_SantaEularia/JVET-AP_Logistics.docx, and in the WG 5 calling notice (N 393) and agenda (N 394) for the 23rd WG 5 meeting.
Software integration was finalized approximately according to the plan.
Various problem reports relating to asserted bugs in the software, draft specification text, and reference encoder description had been submitted to an informal "bug tracking" system. That system is not intended as a replacement of our ordinary contribution submission process. However, the bug tracking system was considered to have been helpful to the software coordinators and text editors. The bug tracker reports had been automatically forwarded to the group email reflector, where the issues were discussed – and this is reported to have been helpful.
More than 195 input contributions (not counting the AHG reports, summary reports and crosschecks) had been registered for consideration at the current meeting.
It is further noted that, starting from the twentieth JVET meeting, work items which had originally been conducted by the Joint Collaborative Team on Video Coding (JCT-VC) were continued in JVET as a single joint team, as negotiated by the parent bodies. This particularly consists of work on
- High Efficiency Video Coding (HEVC) and its extensions, the development of associated conformance test sets, reference software, verification testing, maintenance, and non-normative guidance information,
- Specification of Coding-independent Code Points (Video) (CICP), and associated technical report(s),
- Maintenance and enhancement work on the Advanced Video Coding (AVC) standard, associated conformance test sets and reference software.
To retain a consistent numbering scheme, the number range of output documents starting from 1001 was reserved for the previous JCT-VC and JCT-3V topic items listed above, whereas the number range starting from 2001 was retained for VVC, VSEI and exploration activities.
A preliminary basis for the document subject allocation and meeting notes for the 42nd meeting had been made publicly available on the ITU-hosted ftp site as http://wftp3.itu.int/av-arch/jvet-site/2026_04_AP_SantaEularia/JVET-AP_notes_d0.docx.
As a follow-up to communication conducted previously, parent bodies are making further considerations about future JVET management structures. As a step forward, SC 29 decided during its 48th meeting in February to appoint Mathias Wien as WG 5 convenor for the period 2027-2029. This means that (provided SG 21 would agree on this appointment), starting from January 2027 JVET will have two chairs (J.-R. Ohm from SG21 side and M. Wien from SC 29 side).
The WG 5 chair thanked experts for the very positive post-meeting feedback submitted to ISO.
- Recommendations
- The AHG recommended its continuation.
- It is recommended to appoint Mathias Wien as additional AHG1 co-chair.