Server Version#: 1.20.2.3370 (last version)
Player Version#: N/A
Hello
For a reason that I don’t understand, I’m able to read directly some 4K movies and some others are transcoded (and make my server crazy)
Here two files, Avatar, no issue for reading, Pacific rim, transcoded.
The thing is, avatar is by default seleted on 4k by player, but pacific rim is selected on HD
Same result from web player or player on LG TV (that read avatar correctly)
If you have an idea of what is my problem 
My money is on the PGS subtitles in Pacific Rim as the cause of the transcoding.
Browsers and a significant number of other clients won’t be able to deal with those.
Plex Web does not support HEVC video. Playing any HEVC video via Plex Web will result in a video transcode.
The Plex client on LG (and Samsung) TVs does not support image based subtitles such as PGS & VOBSUB. Enabling either results in a video transcode. If the audio is transcoding, enabling SRT subtitles also forces a video transcode. If the audio is direct playing/direct streaming, enabling SRT subtitles will not force a video transcode (the video may still transcode for other reasons).
If I remember correctly, enabling SSA/ASS subtitles can also force a video transcode. If the subtitles have formatting information such as position, color, etc., Plex has to burn them into the video to honor the desired formatting.
Do you have 4K & HD versions of the movies in the same library, with a number (indicating multiple versions) in the upper left corner of the cover art?
You can pick which version to play using Play Version. See screenshot from Plex for Windows below. This is not supported on all clients.
Consider keeping 4K & non-4K media in separate libraries (ex: Movies & Movies-4K). This will minimize users selecting 4K media when using non-4K capable clients.
Thanks to both of you, removing PGS subtitles works
Just I don’t find how to “refresh” plex to avoid transcoding
I create a new library and it works
If you have also solution to “refresh” plex, I tried to refresh metadate but nothing change
Try analyzing the movie, then refreshing the metadata.
If all else fails, do the Plex Dance (you will lose play history, etc).
Here’s an excellent guide to converting PGS/VOBSUB to SRT. It can come in handy if you want to convert some PGS subtitles, such as when Na’vi is spoken in Avatar.
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