HDR10+ (plus) support in Windows

[quattro]

I will have to double check when I get home.  My setup isn't HDR capable to validate ACTUAL HDR-ness when I play an HDR video.  But if a video direct plays in Jellyfin Media Player (no tone mapping happens server side), whether the rest of the chain honors the HDR-ness of a video is not caused by Jellyfin is my thinking.

That's interesting. So the process of tone-mapping counts as "transcoding?" I haven't paid attention to what JMP reports in terms of playback mode when viewing HDR files (my assumption is that 99% of media files are direct played), so I'll check if it reports direct play when I'm viewing the HDR file of interest. I'm also pretty sure it's not caused by Jellyfin (server) as I occasionally view HDR content on my iPad Pro via Infuse connected to my Jellyfin library, and I've had zero issues with the app playing the media in HDR. Certainly an issue isolated to JMP. 

I suppose it would be useful for me to mention that I've seen people recommend using the MPV Shim for HDR playback as that one does seem to play said files in native HDR (haven't tested this yet but I'm sure the recommendation is valid). I wouldn't consider this to be as playing the media file on JMP as you're essentially casting it to a different application.