JVET-AG0165 AHG9: On the processing order nesting SEI message [L. Chen, O. Chubach, Y. Huang, S. Lei (MediaTek)]

Chaired by J. Boyce.

This contribution proposes to modify the syntax structure for signalling the number of the processing-order-nested SEI messages and the processing orders for each of the target processing order id pon_target_po_id[ i ], adding flexibilities for multiple SEI processing order SEI messages with different values of po_id in CVS.

An expert indicated that this proposes a different approach than had been intentionally selected in the original design and that the desired functionality could be accomplished by sending multiple PON SEI messages. In the existing design it is possible to use the same SEI message payload multiple times without requiring the payload being sent multiple times.

Decision (Ed.): Editor action item: The proponent suggested adding a clarifying note in the semantics to describe the flexibility supported when multiple PON SEI messages are sent. This is delegated to the editors.