Does 12-bit HDR video play?
For each: does it play, and do the squares show inside the white band? V1 and V4 are 10-bit controls.
V1 HEVC Main 10: control
V2 HEVC Main 12
V3 HEVC Main 4:4:4 12
V4 AV1 10-bit (Main): control
V5 AV1 12-bit (Professional)