When is Plex going to add tone mapping for 4K HDR transcoding?

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you can certainly direct play 4k hdr with subtitles.

you just need subtitles that are compatible with your client.

or a better client that is compatible with the subtitles that you want to use.

see below, 4k/hdr+atmos > direct play > shield tube using wifi > yamaha atmos receiver > 4k hdr tv

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if you are getting unexpected transcoding with subtitles, check your audio stream.

if the audio is transcoding and you enable subtitles, then the video will be forced to trancode (plex does this to keep audio/video/subtitles in sync).

solution: change the audio to dolby digital/dts or stereo.

see also @ [INFO] Plex, 4k, transcoding, and you - aka the rules of 4k

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