I have been trying to get HDR to work with this build and my media room setup.
RPi4 <-> Denon AVR-X2600H <-> Optoma CinemaX P2
HDR is not activating when playing any HDR media. In the logs below I attempted to play the Samsung Wonderland 2 HDR video.
I have also connected the RPi4 directly to the Optoma with the same results.