HDR10+ (plus) support in Windows

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The standalone Jellyfin Media Player desktop app, which uses MPV, will direct play HDR10+ if the underlying hardware and operating system supports it.  Jellyfin Media Player is not the same as the one if you access Jellyfin in a web browser.

Are you sure about this? Based upon my experience using the desktop player, JMP can only play HDR videos after tone-mapping them to SDR. I have visually compared the playback of an HDR file on JMP with playback on a player that I know supports native HDR playback, and have confirmed the aforementioned behavior to be accurate. Do let me know if I'm doing something wrong though!