My Opppo 203 sends hi-res audio to the HD621 via its dedicated HDMI 1.4 audio port, which the 205 also has, or by using an HDMI extractor. I manage multiple video sources to a projector with relatively inexpensive 4k splitter and switch.

So, no the audio and video signals are not together, but separated in this type of setup.

Server: Audiolinux Roon NUC w/HAF room correction and crosstalk cancellation
Theater: 218, Allo Signature, miniDSP, HD621, C61R, DSP5200SEu, 420, 33, NHT subs
EtherREGEN w/Finisar fiber, Shunyata Denali
Living Room: RPi4 Diretta Host & Target, Ghent USB > Singxer SU-6 > AES NA M-Links > DSP9
Shunyata TritonV3, LHY lps, Farad Super3, Stack AUVA feet