JVET-AN0001 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 1348 (compared to 1315 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 – 1158 subscribers
• JCT-3V – 680 subscribers
• JVT-experts – 2077 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/2025_06_AM_Daejeon/). It is noted that the previous document sites http://phenix.int-evry.fr/jvet/, http://phenix.int-evry.fr/jct/, and http://phenix.int-evry.fr/jct3v/ were shut down, but JCT-VC and JCT-3V documents can be accessed directly via the JVET site. All documents of JCT-VC, JCT-3V and JVET are also available from the ITU-based ftp site, where 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). 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-AM1005 Future CICP extensions (Draft 1) [Posted 2025-08-01]
• JVET-AM1006 HEVC additional profiles and SEI messages (Draft 4) [Posted 2025-07-23]
• JVET-AM1008 Conformance testing for HEVC multiview extended and monochrome profiles [Posted 2025-07-25]
• JVET-AM1017 Support for additional VSEI messages in AVC (Draft 3), also issued as WG 5 DAM N 363 [Posted 2025-08-01, last update 2025-08-08]
• JVET-AM1018 HEVC with extensions and corrections (Draft 2) [Posted 2025-07-23]
• JVET-AM2005 Additions and corrections for VVC version 4 (Draft 13) [Posted 2025-10-03]
• JVET-AM2006 Additional SEI messages for VSEI version 4 (Draft 7) [Posted 2025-07-23]
• JVET-AM2019 Description of algorithms version 12 and software version 14 in neural network-based video coding (NNVC) [Posted 2025-07-28, last update 2025-08-02]
• JVET-AM2021 Verification test plan for VVC multilayer coding (update 6) [Posted 2025-09-15]
• JVET-AM2023 Exploration experiment on neural network-based video coding (EE1) [Posted 2025-07-03, last update 2025-08-04]
• JVET-AM2024 Exploration experiment on enhanced compression beyond VVC capability (EE2) [Posted 2025-07-03, last update 2025-08-08]
• JVET-AM2025 Algorithm description of Enhanced Compression Model 18 (ECM 18) [Posted 2025-09-24]
• JVET-AM2026 Joint Call for Evidence on video compression with capability beyond VVC, also issued as WG 5 N 367 [Posted 2025-07-05, last update 2025-08-09]
• JVET-AL2032 Technologies under consideration for future extensions of VSEI (version 9) [Posted 2025-08-27, last update 2025-09-08]
• JVET-AL2038 White paper on VSEI, also issued as AG 3 N 209 [Posted 2025-07-25]

It is noted that the following output document from the 38^th JVET meeting also became available:

• JVET-AL2020 Film grain synthesis technology for video applications ed. 2 (Draft 3)

The eighteen ad hoc groups had made progress, and reports from those activities had been submitted. 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 were conducted, and 5 submissions were received as responses to the Joint Call for Evidence on video compression with capability beyond VVC.

The arrangements for the 40^th meeting had been announced in the JVET reflector, in the JVET logistics document (https://www.itu.int/wftp3/av-arch/jvet-site/2025_10_AN_Geneva/JVET-AN_Logistics.docx), and in the WG 5 calling notice (N 369) and agenda (N 370) for the 21^st 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 230 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 to be conducted 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 40^th meeting had been made publicly available on the ITU-hosted ftp site as http://wftp3.itu.int/av-arch/jvet-site/2025_10_AN_Geneva/JVET-AN_notes_d0.docx.

Further discussion needs to be conducted with the parent bodies about future JVET management structures, considering that substantially higher workload could be expected in upcoming standardization activities.

Recommendations

• The AHG recommended its continuation.