JVET-AP0097 AHG9: Implementation and showcase for the danmu information SEI message [J. Xu (Bytedance)] [late]

This document provides an implementation and a showcase for the danmu information SEI message.

In addition, the following aspects are proposed in this document:

1) Fix a bug in the syntax table about di_num_languages.

2) Add a presence flag for di_presentation_priority.

3) Adjust the value mapping table for di_display_type.

4) Add a constraint on di_identifier.

5) Add a constraint on di_text.

Item 1 is delegated to editors.

Item 2 covered in another contribution.

Agreed to item 3 to reorder values of di_display_type, item 4.

Agreed to item 5 with editors to ensure the correct terminology is used.

It was suggested to change the name of the Danmu SEI message.

JVET-AP0097 AHG9: Implementation and showcase for the danmu information SEI message

Colour mapping info (CMI)