JVET-AC0339 New higher level for multilayer coding [S. Iwamura, S. Nemoto, A. Ichigaya (NHK)] [late]
This contribution proposes addition of a higher level for multilayer coding. In VVC version 2, maximum level 6.3 is defined for 4K/8K multilayer coding as well as single layer coding of 12K 60Hz. However, max luma sample rate (MaxLumaSr) of level 6.3 is not sufficient for three-layer coding use case such as 2K/4K/8K multilayer coding with a frame rate of 60Hz. Therefore, new higher level 6.4 for typical three-layer coding is proposed as follows (see italics):
VVC Table A.2 – General tier and level limits
Level | general_level_idc value* | Max luma picture size MaxLumaPs (samples) | Max CPB size MaxCPB (CpbVclFactor or CpbNalFactor bits) | Max slices per AU MaxSlicesPerAu | Max # of tiles MaxTilesPerAu | Max # of tile columns MaxTileCols | |
Main tier | High tier | ||||||
6.3 | 105 | 80 216 064 | 240 000 | 1 600 000 | 1 000 | 990 | 30 |
6.4 | 108 | 80 216 064 | 240 000 | 1 600 000 | 1 000 | 990 | 30 |
Level | Max luma sample rate MaxLumaSr | Max bit rate MaxBR (BrVclFactor or BrNalFactor bits/s) | Min compression ratio MinCrBase | ||
Main tier | High tier | Main tier | High tier | ||
6.3 | 4 812 963 840 | 320 000 | 1 600 000 | 8 | 4 |
6.4 | 9 625 927 680 | 320 000 | 1 600 000 | 8 | 4 |
It was asked if the maximum bit rate should also be increased.
This was planned to be for future consideration. As currently an “unconstrained” level is under development which could e.g. be used for demonstrations of future products, definition of higher levels becomes relevant when those products are foreseeable to be coming to the market. It would be interesting to get information what timelines are expected for this.
Proposed modification of system interface (0)
This section is kept as a template for future use.
AHG15: Optimization of encoders and receiving systems for machine analysis of coded video content (8)
Contributions in this area were discussed in session 6 at 1530–1750 UTC on Thursday 12 Jan. 2023 (chaired by JRO) and in session 13 at 1325–1440 UTC on Monday 16 Jan. 2023 (chaired by JRO).