Where did you find out this? I've read conflicting things about whether I should have the ATV in SDR or Dolby Vision / HDR by default?It’s okay, it does do HDR. You now have to always have HDR/Dolby Vision enabled and the ATV will tone-map (with Dynamic Matching on) down to SDR - interesting, but works well.
I think it possibly does support dynamic range matching.Yes it does but you have to manually change the video settings to match as YouTube still doesn’t support dynamic range and frame rate matching.
HDR isn’t supported in YouTube on the original ATV4K, it’s only available on the new ATV4K.I cannot get HDR to work on my original ATV 4K using YouTube no matter what I play. I use standard HDR with frame matching etc on. Using HBO Max dolby vision etc works fine.
Annoyingly though the stats for nerds shows movies for example are playing back @24hz yet the TV remains at whatever you’ve got the ATV set to.I think it possibly does support dynamic range matching.
My new ATV4K is set to 50Hz SDR. The video I linked to above played in the rec.2020 colour space (according to Stats for Nerds) and HDR on my TV was triggered, while other videos played in BT.709.
Frame rate matching is not supported though (everything plays back at 50Hz unless I manually switch the refresh rate).
Where did you find out this? I've read conflicting things about whether I should have the ATV in SDR or Dolby Vision / HDR by default?