Ad hoc groups

During MPEG meetings, each MPEG sub working group creates ad hoc groups to progress the work on specific topics within a smaller group until the next MPEG meeting. The work is usually progressed by email and conference calls.

Ad hoc groups of MPEG 152

Name	AHG on compressed video for study of quality metrics (CVQM)
Group	AG 5 - MPEG Visual Quality Assessment
Mandates	1. Prepare and finalize summary report on CVQM-UHD subjective quality assessment experiments; 2. Aggregate, consolidate and extend information about quality metrics provided in m74357 and prepare a draft report as input contribution to the next meeting; 3. Study the feasibility of extending CVQM to include HDR content; 4. Study the correlation between objective quality metrics and subjective quality scores using the CVQM dataset as well as suitable public datasets; 5. Study the suitability of learning-based quality metrics for evaluating compression performance.
Chair(s)	Yan Ye, Zhibo Chen, Benjamin Bross, Mathias Wien
Duration	until the next AG 5 meeting
Reflector(s)	mpeg-vqa@lists.rwth-aachen.de
Subscribe	https://lists.rwth-aachen.de/postorius/lists/mpeg-vqa.lists.rwth-aachen.de/
Meeting	Meetings are held online and are to be announced at least two weeks before the AHG meeting date.	Room Size
Meeting

Name	AhG on MPEG DASH
Group	General/All
Mandates	1. Study and collect proposals for advancing the Part 1 AMD PD(WG03N1659) and WD of Part 7 (WG0N1659) 2. Study technologies under consideration (TuC; WG03N1614) and defect under investigation (DuI; WG03N1568) 3. Provide a white paper draft describing the 6th ed new features and how they can be used for various applications. 4. Continue to work on conformance and reference software
Chair(s)	Iraj Sodagar, Ali C. Begen
Duration	Until the next MPEG meeting
Reflector(s)	dash@lists.aau.at
Subscribe	https://lists.aau.at/mailman/listinfo/dash
Meeting	Calls:	Room Size
Meeting

Name	AhG on media authenticity and provenance indication with the MPEG Systems technologies
Group	General/All
Mandates	1. Continue the gap analysis of the existing MPEG ISOBMFF and DASH standards for addressing WG03N1631 requirements. 2. Continue the gap analysis of other MPEG standards and non-MPEG standards for addressing WG03N1631 requirements when used in conjunction with MPEG ISOBMFF and DASH. 3. Define media authenticity workflows for WG03N1631 use cases identifying the process by various actors and entities, and required functionalities and interfaces between them. 4. Investigate if each of the following standards requires a generic solution for carriage and signaling of the media authentication and provenance metadata a. ISOBMFF/CMAF b. DASH c. MPEG 2TS 5. Collaborate with the relevant organizations such as C2PA, EBU and SVTA/DASH-IF on the media authentication
Chair(s)	Iraj Sodagar, Youngkwon Lim
Duration	Until the 20th MPEG Systems WG meeting
Reflector(s)	gen-sys@lists.aau.at
Subscribe	http://lists.aau.at/mailman/listinfo/gen-sys
Meeting	Meeting 1: - If the room is available, Dec 5, 17-18 UTC, New York City (Hybrid) - Otherwise Dec 9, 17-18 UTC, online Meeting 2: Jan 13, 17-18 UTC, zoom zoom link: https://iso.zoom.us/my/sodagar Password can be found on the mpeg calendar.	Room Size
Meeting

Name	AhG on Guidelines for Subjective Visual Quality Evaluation
Group	AG 5 - MPEG Visual Quality Assessment
Mandates	1. Maintain the output document on “Guidelines for verification testing of visual media specifications”; 2. Maintain the output document on “Guidelines for remote expert viewing sessions”; 3. Consider extensions and refinements of the guidelines for remote expert viewing for more test types. 4. Finalize a guideline for the naming conventions for raw video data.
Chair(s)	Mathias Wien, Lu Yu, Joel Jung
Duration	until the next AG 5 meeting
Reflector(s)	mpeg-vqa@lists.rwth-aachen.de
Subscribe	https://lists.rwth-aachen.de/postorius/lists/mpeg-vqa.lists.rwth-aachen.de/
Meeting	Meetings are held online and are to be announced at least two weeks before the AHG meeting date.	Room Size
Meeting

Name	AhG on Carriage of Green Metadata
Group	General/All
Mandates	1. consolidate ISO/IEC 23001-11 Ed.3 AMD2 2. start the new amendment for ISO/IEC 23001-11 Ed.3 AMD3 3. continue to consolidate and improve of ISO/IEC 23001-19 Carriage of green metadata 4. study the transport of MPEG-GREEN Access Units over MPEG-2 systems (ISO/IEC 13818-1 aka. Rec. ITU-T H.222.0) and solicit contributions that improve ISO/IEC JTC 1/SC 29/WG 3/N 1517
Chair(s)	Olivier Le Meur, Christian Herglotz
Duration	Until next MPEG meeting
Reflector(s)	gen-sys@lists.aau.at – use [green] in email header
Subscribe	http://lists.aau.at/mailman/listinfo/gen-sys
Meeting	Several online sessions before the next MPEG meeting if necessary	Room Size
Meeting

Name	AhG on MPEG-I immersive audio and audio maintenance
Group	General/All
Mandates	1. Work on Amd1 of MPEG-I immersive audio 2. Study and progress the integration of MPEG-I immersive audio into WG 3 MPEG-I scene description 3. Study and progress file format for MPEG-I immersive audio 4. Maintain audio-related text, conformance data and reference software 5. Prepare verification test for MPEG-I immersive audio 6. Study and progress media authenticity for MPEG audio technologies 7. Study and progress MPEG-4 audio immersive interchange format
Chair(s)	Thomas Sporer (FhG-IDMT) thomas.sporer at idmt.fraunhofer.de Christof Fersch (Dolby) christof.fersch at dolby.com Sujeet Mate (Nokia) Sujeet.mate at nokia.com Moritz Fuchs (FhG-IIS) moritz.fuchs at iis.fraunhofer.de
Duration	Until next WG 6 Meeting
Reflector(s)	mpeg-audio @ idmt.fraunhofer.de
Subscribe	•To subscribe to the list use the instructions in m68318 (Sapporo Meeting) •To post on the mailing list, send email to mpeg-audio @ idmt.fraunhofer.de Note that posting is blocked for non-members Note that the previously used email list will stop operation soon.
Meeting		Room Size
Meeting	WG6 AhG meetings as follows: Joint meeting with WG3 scene description to discuss common architecture: • See Scene Description AhG meeting schedule • Tue 2025-12-02 9:00-11:00 UTC (Verification Test Preparation, Zoom) • Tue 2025-12-02 11:00-12:00 UTC (Any other topics; may be canceled without input, Zoom) https://iso.zoom.us/j/2162331649?pwd=MVdzd1l0ejRPNXNubmVYZnd5bjlyZz09 • Documents to be discussed in the AhG meeting on 2025-12-02 shall be registered and uploaded before 2025-11-28, 23:59 UTC. • Documents to be discussed at the 22nd WG 6 meeting shall be registered until 2026-01-12, 23:59 UTC and uploaded until 2026-01-14, 23:59 UTC.

Name	AhG on Compression of Neural Networks for Multimedia Content Description and Analysis
Group	General/All
Mandates	1. Maintain data sets and INCTM 2. Collect further application and performance reports of NNC 3. Continue interaction with SC42, SG16/Q5, 3GPP SA4, NNEF, ONNX and the AI/ML community 4. Elaborate use cases and requirements for applying NNC to tensor data from AI-based media processing and study relation to other MPEG activities 5. Continue EEs on NNC for tensor data from AI-based media processing
Chair(s)	werner.bailer@joanneum.at,Werner Bailer (chair) smchun@insignal.co.kr,Sungmoon Chun (vice-chair)
Duration	until next MPEG meeting
Reflector(s)	mpeg-nnr@lists.aau.at
Subscribe	Email to: mpeg-nnr-join@lists.aau.at
Meeting	Thursday, January 15, 2026, 06:00 UTC (online)	Room Size
Meeting

Name	AhG on Audio coding for machines
Group	General/All
Mandates	1. Prepare and coordinate CfP submissions 2. Collaborate with ITU-T SG21/Q.6 VCEG 3. Identify industries and use cases for ACoM Phase 2
Chair(s)	Sang-Wook Kim (CAU) swkim4 at cau.ac.kr Thomas Sporer (FhG-IDMT) thomas.sporer at idmt.fraunhofer.de
Duration	Until next WG 6 Meeting
Reflector(s)	mpeg-acom@lists.aau.at
Subscribe	https://lists.aau.at/mailman/listinfo/mpeg-acom
Meeting		Room Size
Meeting	WG6 zoom AhG meetings on ACoM as follows: Tue 2025-11–11 09:00-11:00 UTC (topic: CfP, Open questions, no inputs papers necessary) Tue 2026-01–13 09:00-11:00 UTC (topic: CfP evaluation) Zoom link https://iso.zoom.us/j/9218290580?pwd=y48Fq1IZyBEBJmva3Mq1ZKNZlbDnre.1 • Documents to be discussed in the AhG meeting on 2026-01-13 shall be registered and uploaded before 2026-01-10, 23:59 UTC. • Documents to be discussed at the 22nd WG 6 meeting shall be registered until 2026-01-12, 23:59 UTC and uploaded until 2025-01-14, 23:59 UTC.

Name	AhG on Video-based Graphics Coding
Group	WG 7 - MPEG Coding of 3D Graphics and Haptics
Mandates	Coordinate V-PCC CEs for GSC and conduct the corresponding experiments Release branch of the V-PCC test model for core experiments Conduct V-DMC experiments Release new version of the V-DMC test model (SW and documentation) during the editing period Solicit contributions on V-DMC conformance Coordinate preparation of the V-PCC and V-DMC reference software Solicit additional data sets for all categories including multiple attribute Solicit contributions for V-DMC subjective verification test Investigate the usage of dynamic mesh compression for static content Propose corrections for identified issues in the V3C, V-PCC and V-DMC specifications Coordinate scientific and technical dissemination of V-PCC and V-DMC Coordinate communications of V-PCC & V-DMC to fairs, exhibitions, workshops, webinars
Chair(s)	Ralf Schaefer (Chair), Danillo Graziosi
Duration	Until the next MPEG WG 7 Meeting
Reflector(s)	mpeg-3dgc AT gti. ssr. upm. es
Subscribe	To subscribe, send email to https://mx.gti.ssr.upm.es/mailman/listinfo/mpeg-3dgc
Meeting	Several online sessions before the next MPEG meeting to be announced on the 3DGH reflector ASAP (avoid Friday before the next MPEG meeting) The online calendar also contains the information of the meetings logistics (to be ensured by the AhG chairs)	Room Size
Meeting

Name	AhG on Lenslet Video Coding (LVC)
Group	WG 4 - MPEG Video Coding
Mandates	1. Maintain Lenslet Video Test Model (LVTM) 2. Maintain Reference Lenslet content Convertor (RLC) 3. Conduct Core Experiments for LVC 4. Study on Depth Compression for LVC 5. Study on Entropy Coding for Meta Data Compression for LVC 6. Study on Inter-prediction for LVC
Chair(s)	Mehrdad Teratani, teratani.mehrdad.v5@f.mail.nagoya-u.ac.jp (co-chair) Xin Jin, jin.xin@sz.tsinghua.edu.cn (co-chair)
Duration	Until next MPEG meeting
Reflector(s)	mpeg-i-visual@lists.aau.at
Subscribe	https://lists.aau.at/mailman/listinfo/mpeg-i-visual
Meeting	Online 31 October 2025 1000-1400 UTC (Text of WD) 5 November 2025 1000-1200 UTC (Text of WD) 7 November 2025 1000-1200 UTC (Text of WD) 28 November 2025 1000-1200 UTC (CEs) 14,16 January 2026 1000-1400 UTC	Room Size	20
Meeting	Online	Zoom link to be announced

Name	AhG on Geometry-based Point Cloud Compression
Group	General/All
Mandates	1. Coordinate the editing for the Enhanced G-PCC and Solid G-PCC 2. Update the TMs (SW and documentation) during the editing period 3. Conduct the G-PCC experiments for future enhancements 4. Coordinate scientific and technical dissemination of G-PCC as well as communications of G-PCC to fairs, exhibitions, workshops, webinars 5. Solicit additional data sets for all categories 6. Conduct activities to improve E-G-PCC Reference SW 7. Conduct E-G-PCC Conformance bitstream generation 8. Coordinate the evaluation activity for G-PCC AMD for GSC 9. Solicit contributions to define G-PCC profile for E-G-PCC
Chair(s)	Hyejung Hur, Sébastien Lasserre, Yingzhan Xu, Alexandre Zaghetto, Ohji Nakagami
Duration	until the next MPEG WG7 meeting
Reflector(s)	mpeg-3dgc@gti.ssr.upm.es
Subscribe	to https://mx.gti.ssr.upm.es/mailman/listinfo/mpeg-3dgc
Meeting	Several online sessions during the week before the next MPEG meeting. The online calendar also contains the information of the meetings logistics (to be ensured by the AhG chairs)	Room Size
Meeting

Name	AhG on Haptics Coding
Group	WG 7 - MPEG Coding of 3D Graphics and Haptics
Mandates	Phase 1: 1. Solicit contributions to improve Phase 1 standard and reference software algorithm as part of EE4 2. Support File Format ISOBMFF and DASH for ISO/IEC 23090 for the conformance part 37 3. Finalize the white paper on Haptics to be published by AG3 and finalize the public webpage Phase 2: 4. Progress the work for implementing the architecture of the Spatial Haptic Model (SHM) and integration with MPEG-I SD 5. Solicit contributions for EE1, EE2, EE3 and EE5 6. Update the Evaluation Platform (HEP1.0) with the new technologies and scenarii
Chair(s)	Philippe Guillotel (philippe.guillotel@interdigital.com) Roope Raisamo (roope.raisamo@nokia.com) Quentin Galvane (quentin.galvane@interdigital.com)
Duration	Until next MPEG meeting
Reflector(s)	mpeg-haptics@lists.aau.at – use [Haptics] in email header
Subscribe	https://lists.aau.at/mailman/listinfo/mpeg-haptics
Meeting	Calls Oct. 29 + Nov. 19 + Dec. 10, Jan. 07, Friday Jan. 16 pre-MPEG#153 at 1400 UTC. Dial-in details: https://iso.zoom.us/j/7945431076?pwd=b21hT3FWWlUxRVA5S0hZSFYzRGtSUT09	Room Size
Meeting

Name	AhG on Animation Compression
Group	General/All
Mandates	1. Collect representative datasets for avatar animation, including skeletal and facial motion. 2. Define evaluation metrics, software and quality assessment methodologies for comparing animation compression technologies, including for instance distortion of motion trajectories, joint position accuracy, rotational smoothness over time, and decoding latency, etc. 3. Review existing proposals for avatar animation compression and assess their applicability to streaming and real-time use cases. 4. Explore mechanisms to map compressed animation streams to ARF, including necessary metadata. 5. Address open issues collected in the exploration document. 6. Develop relevant software tools for evaluation 7. Start preparing a draft CTC
Chair(s)	Thomas Stockhammer (tsto@qti.qualcomm.com) Anthony TRIOUX (anthony_trioux@xidian.edu.cn)
Duration	Until MPEG153
Reflector(s)	mpeg-i-ac@lists.aau.at
Subscribe	https://lists.aau.at/mailman/listinfo/mpeg-i-ac Please check gitlab discussions here: https://git.mpeg.expert/MPEG/3dgh/ac/contributions/-/issues
Meeting	AHG Meetings • Call: Monday December 15, 13:30 – 15:00 UTC (14:30 – 16:00 CET) • Call: Friday January 16, 13:30 – 15:00 UTC (14:30 – 16:00 CET) Note: • AHG meeting for WG03 Scene Description o Call: Monday October 27, 14:30 – 16:00 UTC (15:30 – 17:00 CET) o Call: Monday December 15, 15:00 – 16:00 UTC (16:00 – 17:00 CET) o Call: Friday January 16, 15:00 – 16:00 UTC (16:00 – 17:00 CET) • 3GPP SA4#134, November 13 - 17, 2025, Dallas, TX US • MPEG#153, January 19 – 23, 2026, Online Logistics • Zoom: http://iso.zoom.us/my/stockhammer, Passwd as of MPEG#152 • Chairs create issues in gitlab to collect comments. • If MPEG#153 repository is not yet available, use MPEG#152 repository.	Room Size
Meeting

Name	AhG on Font Format
Group	WG 3 - MPEG Systems
Mandates	1. Explore and propose potential future changes and updates to the text of OFF 5th edition.
Chair(s)	Vladimir Levantovsky (Type Standards)
Duration	Until next meeting
Reflector(s)	mpeg-otspec@lists.aau.at; https://github.com/MPEGGroup/OpenFontFormat
Subscribe	https://lists.aau.at/mailman/listinfo/mpeg-otspec
Meeting	Zoom conference call may be held, if necessary (detailed information will be posted to the AHG reflector)	Room Size
Meeting

Name	AhG on IoMT
Group	General/All
Mandates	- Collect new industrial usecases for use of multimedia AI processing in distributed, lowresosurces environments - Study industrial needs related to multimedia processing by physical, embedded and agentic AI and analyze the opportunity of existing IoMT and MPEG-V - Study the means for ensuring processing by AI on distributed processing platforms - Study the gaps between existing IoMT technologies and the needs of distributed hybrid media AI processing environment, with authentication/tracking of sources, destinations, and processing types applied on a hybrid content - Study the means for integrating existing traceability/authentication mechanisms (both inside and ouside ISO) in IoMT
Chair(s)	Mihai Mitrea, Sang-Kyun Kim
Duration	Until the next MPEG WG7 Meeting
Reflector(s)	MIoTW@lists.aau.at
Subscribe	http://lists.uni-klu.ac.at/mailman/options/MIoTW send an email to MIoTW-join@lists.aau.at
Meeting	Fri before meeting, 8am UTC	Room Size	20
Meeting	https://iso.zoom.us/j/92992119841?pwd=eksrd2Z4d09uS1VYYTB1MTZLc085UT09

Name	AhG on Genomic Information Representation
Group	WG 8 - MPEG Genomic Coding
Mandates	1. To contribute to the execution of the Core Experiments identified in Description of Core Experiments on Graph Genomes N273 and on genomic information representation N272 2. To contribute to the development of Part 1 and Part 2 Amd1 Support of graph genome 3. To contribute to the development of a 2nd edition 23092-5 to support Part 6 and the new technologies identified by the answer to the call for technology 4. To support the organization and continuing the progress of the hackathon disseminating the information and supporting the participants. 5. To finalize the reference software annex to 23092-4 3rd edition 6. To compile common test conditions for the evaluation of MPEG-G performance 7. To collect additional test data useful to be used for executing CEs on graph genome and native representation of DNA methylation information. 8. To build a complete MPEG-G dataset repository on the official MPEG content ftp. 9. To disseminate the information and coordinate the activities carried out by ISO/IEC JTC 1/SC 29/WG 8 to other ISO TCs, GA4GH and other organizations 10. Discuss objectives and prepare a workplan for a workshop showcasing MPEG-G standard capabilities open to non-ISO members.
Chair(s)	Raymond Krasinski (Philips) Paolo Ribeca (Bioss)
Duration	Until the next WG8 meeting
Reflector(s)	SC29-WG8-AHG@listes.epfl.ch
Subscribe	To subscribe, send email to SC29-WG8-AHG-subscribe@listes.epfl.ch
Meeting	Yes	Room Size	n.a.
Meeting	As needed, virtual meetings for the coordination of the development of the AHG mandates may be scheduled on zoom with the appropriate advanced notice. An Ad Hoc virtual meeting on Zoom preceding the next MPEG meeting will take place on Thursday 15rd of January at 14:00 CET to 17:00 CET.

Name	AhG on MPEG-G Application Formats and Profiles
Group	WG 8 - MPEG Genomic Coding
Mandates	1. 1. Extend, perform, and evaluate core experiments 2. Determine the impact of the profiles on MPEG-G compression performance 3. Draft the specification of Part 7 Application formats and profiles 4. Verify the compatibility and consistency of the Part 7 specification
Chair(s)	Yeremia Gunawan Adhisantoso (Leibniz University Hannover), Patrick Cheung (Philips NL)
Duration	Until the next WG8 meeting
Reflector(s)	WG8-Profiles-AHG@listes.epfl.ch
Subscribe	To subscribe, send email to WG8-Profiles-AHG-subscribe@listes.epfl.ch
Meeting	YES	Room Size	n.a.
Meeting	As needed, virtual meetings for the coordination of the development of the AHG mandates may be scheduled on zoom with the appropriate advanced notice. An Ad Hoc virtual meeting on Zoom preceding the next MPEG meeting will take place on Thursday January 15th immediately following the AHG meeting on genomic information representation.

Name	AhG on Feature Coding for Machines
Group	WG 4 - MPEG Video Coding
Mandates	1. Develop and release updated FCTM software, anchors, PWD, and CTTC. 2. Conduct Core Experiments. 3. Conduct FCTM studies (FE1-2 on training and CTTC) 4. Conduct exploration on FCM functionalities. 5. Investigate remaining causes of discrepancy in FCTM simulations and propose solutions. 6. Continue to refine Common Test and Training Conditions. 7. For FE2, solicit additional test datasets for Pose estimation and video instance segmentation. 8. Study FCTM complexity. 9. Studying the optimal usage of the inner codec. 10. Provide requirements on weight/topology acquisition.
Chair(s)	chris.rosewarne@canon.com.au,Chris Rosewarne (Canon) zhangy666@chinatelecom.cn,Yuan Zhang (China Telecom)
Duration	Until the next MPEG meeting
Reflector(s)	mpeg-wg4-fcm@lists.aau.at
Subscribe	https://lists.aau.at/mailman/listinfo/mpeg-wg4-fcm
Meeting	Interim AhG meeting: October 24 (preceding anchor/CTTC release): For next FCTM and CTTC: Decide NN part 2 threshold(s), supplementary result to be added to CTTC.	Room Size
Meeting	Tues (January 13): 2300-Wed 0100 UTC, 0120-0320 UTC. Friday (January 16): 0000 0200 UTC, 0220-0420 UTC.

Name	AhG on MPEG-AI
Group	WG 2 - MPEG Technical Requirements
Mandates	1) Investigate reproducibility for AI-based methods in Media coding - Identify different tolerance levels of reproducibility - Analyze minimum and maximum reproducibility aspects - Mandatory and non-mandatory AI components for reproducibility - How the effect of computational imprecision can be mitigated 2) Technical requirements analysis on NN model hosting 3) Communicate with SC29/WGs on related aspects 4) Produce a report on reproducibility of AI-based approaches in Media and NN model management.
Chair(s)	Gilles Teniou, Tencent (teniou@global.tencent.com) Dong Tian, InterDigital (dong.tian@interdigital.com)
Duration	Until the next MPEG meeting
Reflector(s)	mpeg-ai@lists.aau.at
Subscribe	https://lists.aau.at/mailman/listinfo/mpeg-ai
Meeting	2-weeks notice as needed	Room Size
Meeting

Name	AhG on Smart Contracts for Media
Group	WG 3 - MPEG Systems
Mandates	1. Solicit industry participation and contributions for ISO/IEC 23000-23 Decentralized Media Rights Application Format based on ISO/IEC 21000-23 Smart Contracts for Media taking into consideration the latest AI regulatory developments. 2. Study and solicit contributions (e.g., technologies and APIs) for ISO/IEC 23000-23 Decentralized Media Rights Application Format in the areas: a) Smart contracts and DLTs; b) Rights and metadata management; c) Content and creator IDs; and c) File formats and streaming protocols. 3. Enhance collaboration with liaisons (e.g., ISO/TC 307, ITU-T SG21, INATBA, W3C DIDs, ISCC, AMAS and EC) and conduct further dissemination activities (e.g., Digital Asset Management WG - Metaverse Standards Forum). 4. Study and improve the WD of ISO/IEC 23000-23 Decentralized Media Rights Application.
Chair(s)	Panos Kudumakis and Mirko Zichichi
Duration	Until the 153rd MPEG meeting
Reflector(s)	smart-contracts@lists.aau.at
Subscribe	https://lists.aau.at/mailman/listinfo/smart-contracts
Meeting	Biweekly calls starting Wed 22 Oct 2025 alternatively at 14:00 & 16:00 UTC (2 h).	Room Size
Meeting