JVET-AM0210 AHG9: On miscellaneous aspects in digitally-signed content SEI messages in VSEI v4 draft [H. Tan, J. Lee, J. Nam, C. Kim, J. Lim, S. Kim (LGE)]

Chaired by S. Deshpande on 28 June 2025 during 15:30-15:45

This contribution proposes changes that are asserted improve various aspects for the design of digitally-signed content (DSC) SEI messages. The proposed items include:

• Item 1: On the presence of DSCV SEI messages:

It was commented that adoption of JVET-AM0119 (removal of conditional signalling) takes care of any asserted problem related to this.

It was confirmed that DSCV does not need be present only at the last AU.

Discussed again on 29 June 2025 during 9:45-9:55

It was commented that the proposed condition change only corresponds to “dscv_signed_content_end_flag shall be equal to 1” case.

Decision: It was agreed to make this change as it is editorial after the adoption of JVET-AM0119.

• Item 2: On restarting content signing when verification substream structure changes:

It was commented that an existing constraint already takes care of any issue related to the problem statement of this item.

• Item 3: On the need for DSCV SEI messages to be present for every verification period:

No support to relax the constraint.

• Item 4: On signalling of dscv_signed_content_end_flag:

Adoption of JVET-AM0119 (removal of conditional signalling) takes care of any asserted problem related to this.

• Item 5: On the number of verification substreams and signalling for this information

Item 5 doesn’t need to be discussed (as it is identical to another proposal. See notes under JVET-AM0047 item 2).

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Contributions in this area were discussed during 1230–1530 on Friday 27 June 2025 (chaired by J. Boyce).

JVET-AM0210 AHG9: On miscellaneous aspects in digitally-signed content SEI messages in VSEI v4 draft

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