JVET-O0616 Non-CE: Various chroma format support in VVC [N. Zhang, L. Zhang, H. Liu, K. Zhang, Y. Wang (Bytedance)]
This contribution was discussed Friday 5 July at 1805 (chaired by GJS).
In the last meeting, it is decided to support 4:0:0 colour format in VVC. Several tools related to chroma coding have been modified to be conditionally enabled or signalled. However, it is noticed that some tools still need to be modified under the consideration of different colour formats. In this contribution, signalling of a few syntax elements and semantics are further modified based on the condition of ChromaArrayType.
The proposes not sending useless syntax elements in the SPS and slice header. The proponent indicated that this was something agreed in spirit at the previous meeting.
- SPS
- Chroma bit depth
- PCM chroma bit depth
- SH
- Slice ALF chroma indication
- Slice chroma residue scaling flag
- ALF chroma filter signal flag
It was noted that in HEVC we don’t do the suggested removals in the SPS, only one bit needs to be wasted for each of these.
Decision (bug fix / cleanup): Adopt the SH aspects only.