Expected behavior for Plex Web.
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Due to the constraints of the web browser, Plex Web is a very limited client. On Windows, it has no support for HEVC video of any type, including Dolby Vision.
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Plex Media Server does not support transcoding of Dolby Vision video.
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Dolby Vision Profile 5 does not have a HDR compatibility layer.
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Therefore, since the client does not support the format and the server cannot transcode the format, playback fails with the “color space not supported” error.
If you wish to play Dolby Vision profile 5 videos in Plex, you will need both a client and display that supports the format.
Examples:
- LG webOS TV that supports DV using the Plex webOS app.
- Nvidia Shield Pro connected to a DV capable TV/monitor
- Amazon Fire Stick 4K Max connected to a DV capable TV/monitor