JVET-AP0091 AHG9: On semantics related to persistence_flag and cancel_flag in various SEI messages in VSEI v4 and VSEI TuC [J. Xu, Y.-K. Wang (Bytedance), H. Tan (LGE)]

This document proposes the following items:

1. Change the semantics related to persistence_flag of various SEI messages to not be conditioned on the output status of the picture. The related SEI messages include the FGC, CCV, ERP, GCMP, SR, RWP, AR, OV, SARI, ACI, DO, PRI, CTI, NNPFA, PI, EOI, SPTI, OMI, MI, TDI, AURR, IFM, FGR, LOC, GRI, PCI, DOI, DR, CMI, ASAI, and LAM SEI messages.

It was suggested to add a note for the SEI messages in VSEI v4, AVC, and HEVC. Agreed to add a note.

For SEI messages in the TuC, a change can be made. A constraint could be made.

Further discussion requested after offline discussion.

2) Change the semantics related to cancel_flag of various SEI messages for clarification, especially for the cases related to multi-layer bitstreams. The related SEI messages include the ERP, GCMP, SR, RWP, AR, OV, DO, NNPFA, EOI, MI, AURR, IFM, DOI, PCI, DR, DI, and LAM SEI messagesIt was questioned if any changes were needed. It was questioned if there are any implications if an SEI message is nested in a scalable nesting SEI message.

Agreed for VSEI errata and the TuC.

Further discussed at 1500 on Wednesday 29 April 2026 chaired by J. Boyce.

A -v3 version has been uploaded with a new author added.

Agreed to the -v3 version.

JVET-AP0091 AHG9: On semantics related to persistence_flag and cancel_flag in various SEI messages in VSEI v4 and VSEI TuC

JVET-AP0091 AHG9: On semantics related to persistence_flag and cancel_flag in various SEI messages in VSEI v4 and VSEI TuC