JVET-U0009 JVET AHG report: SEI message studies (AHG9) [J. Boyce, S. McCarthy, C. Fogg, P. de Lagrange, A. Luthra, G. J. Sullivan, A. Tourapis, Y.-K. Wang, S. Wenger]

At the 20th JVET meeting, the AHG on SEI message studies was established with the following mandates:

• Study the SEI messages in VSEI, VVC, HEVC and AVC.
• Collect software and SEI showcase and usage information for SEI messages, including encoder and decoder implementations and bitstreams for demonstration and testing.
• Identify potential needs for additional SEI messages.
• Study SEI messages defined in HEVC and AVC for potential use in the VVC context.
• Coordinate with AHG3 for software support of SEI messages.

The following contributions were identified as related to AHG9. It is noted that some of the contributions were not identified as AHG9 in their titles.

• JVET-U0045 AHG9: Picture output suppression SEI message [M. Pettersson, R. Sjöberg, M. Damghanian, J. Ström (Ericsson)]
• JVET-U0049 AHG2: Some errata items for AVC [Y.-K. Wang (Bytedance), G. J. Sullivan (Microsoft)] (Errata item 1 relates to AHG9)
• JVET-U0053 AHG9/AHG11: Level information for super-resolution neural network [T. Chujoh, E. Sasaki, T. Suzuki, T. Ikai (Sharp)]
• JVET-U0078 AHG9: Out-of-loop luma mapping with chroma scaling using APS or SEI message parameters signalling [E. François, P. de Lagrange, F. Le Léannec (InterDigital)]
• JVET-U0082 AHG9: Scalability dimension SEI message and three HEVC SEI messages [Y.-K. Wang, L. Zhang, K. Zhang, Z. Deng, Y. Wang (Bytedance), A. Vetro (MERL), M. Mrak, S. Blasi (BBC)]
• JVET-U0083 Signalling of decoder initialization information [Y.-K. Wang, K. Zhang, L. Zhang, Y. Wang, J. Xu, Z. Deng (Bytedance)] (Aspect 2.2 DII signalling in SEI relates to AHG9)
• JVET-U0084 AHG9: Cross RAP referencing (CRR) SEI message [Y.-K. Wang, Y. Wang, L. Zhang, K. Zhang, Z. Deng (Bytedance)]
• JVET-U0085 AHG2: Some VVC errata items [Y.-K. Wang, Z. Deng, Y. Wang (Bytedance)] (Errata items 1, 2, 5, and 6 relate to AHG9)
• JVET-U0086 AHG2: Some VSEI errata items [Y.-K. Wang (Bytedance)]
• JVET-U0091 AHG9/AHG11: SEI message for carriage of neural network information for post filtering [B. Choi, Z. Li, W. Wang, W. Jiang, X. Xu, S. Wenger, S. Liu (Tencent)]
• JVET-U0092 AHG9: Allocation of SEI message payload type for MPEG-I MIV/V3C carriage [J. Boyce (Intel)]
• JVET-U0097 GDR Software [S. Hong, L. Wang, K. Panusopone (Nokia)] (Software and configuraton relate to AHG9)
• JVET-U0098 AHG9: Composite Picture Information (CPI) SEI Message [Hendry, H. Jang, S. Kim, J. Lim (LGE)]
• JVET-U0118 Crosscheck of JVET-U0078 (AHG9: Out-of-loop luma mapping with chroma scaling using APS or SEI message parameters signalling) [F. Pu (Dolby)]

The regular JVET e-mail reflector was used for discussions (jvet@lists.rwth-aachen.de) with [AHG9] in message headers. There were no emails besides the AHG kickoff message sent to the JVET reflector during the AHG period.

The AHG recommended to:

• Review all related contributions;
• Continue SEI messages studies.