[dpar]

Yep I realize Dolby Vision should fall back to HDR, but I know there are videos out there that only have a Dolby Vision layer so have no fall back. And these being from Apple I wasn't sure if that could be the case here, since Apple likes to follow it's own path. I'll download some of the videos and try them out to see how it goes.

To answer my own question, none of these 4K HDR screensavers seem to have an HDR base, all seem to be Dolby Vision only. I spot checked several of them with mediainfo and only saw DV layer. I also tested playing them through Kodi and outside of it and HDR doesn't trigger.

I can't say that ALL of them are this way as I only tested a handful, so maybe there are some that are HDR compatible? Unless there's an issue with HDR .mov files somewhere, but I don't believe that's the case since mediainfo doesn't report anything other than DV with no HDR compatible listed.

For now I'm using the 4K SDR versions which still look very good, just a little disappointing that I can't use the HDR versions.