VVC follows the concept that parsing of SEIs shall be independent of parameter sets

- set slice type properly
- fix coding tool conditions that check for IRAP, but should be checking for intra

Renumbering level according to major*16+minor*3, with maximum level now
15.5 (not 8.3).

Karsten Suehring authored 4 years ago and Frank Bossen committed 4 years ago

- also disable decoder conformance checks that fail for multi-layer streams apparently without valid reason
- rename Picture::layer to temporalId, because temporal ID is stored in this member variable

Document updated

Fix to signal bitrate and CPB size in HRD parameters
Fix to make sure the PT SEI is generated for every picture