I set gfx.wayland.hdr to true and tried opening this video. It says HDR around the cogwheel, but the colors are washed out. With this option disabled the video looks great.
I tried enabling other options, like native_srgb and compositor as suggested online, but no difference.
Ah, got it! Yes, HDR works fine for me in MPV. Maybe I should install an extension to open videos in it 🤔
Nice! Glad to hear it works.