# Plex server (on PC) unable to transcode 4k mkv files - Roku player

**URL:** <https://forums.plex.tv/t/plex-server-on-pc-unable-to-transcode-4k-mkv-files-roku-player/757541>\
**Category:** Plex Players\
**Tags:** roku\
**Created:** [November 13, 2021, 7:24pm UTC](https://forums.plex.tv/t/plex-server-on-pc-unable-to-transcode-4k-mkv-files-roku-player/757541 "2021-11-13T19:24:25Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![arules99\_eagan\_gmail\_com](https://avatars.discourse-cdn.com/v4/letter/a/dfb087/32.png) [@arules99\_eagan\_gmail\_com](https://forums.plex.tv/u/arules99_eagan_gmail_com)\
**Post date:** [November 13, 2021, 7:24pm UTC](https://forums.plex.tv/t/plex-server-on-pc-unable-to-transcode-4k-mkv-files-roku-player/757541/1 "2021-11-13T19:24:25Z")

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My plex server is on a PC (i5-7200U CPU @ 2.50GHz 2.70 GHz) 8GB RAM.  
When I try to play 4k UHDBlu Ray rips (mkv) files, the player (Roku ultra) buffers terribly and finally gives message that server is not powerful enough to process the playback.

I have Plex Pass, but will unsubscribe if I can’t play 4k rips.  
Roku Ultra is hardwired to the PC (Plex server) - not wifi.

Please advise server settings.

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**Author:** ![BanzaiInstitute](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/banzaiinstitute/32/293273_2.png) [@BanzaiInstitute](https://forums.plex.tv/u/BanzaiInstitute)\
**Post date:** [November 13, 2021, 7:31pm UTC](https://forums.plex.tv/t/plex-server-on-pc-unable-to-transcode-4k-mkv-files-roku-player/757541/2 "2021-11-13T19:31:04Z")

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If by chance you are trying to play an HDR rip on a SDR display, that asks the server to do tone mapping. A Windows Plex server cannot take advantage of Quick Sync tone mapping either.

Maybe that’s not your setup, but it would explain it.

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**Author:** ![arules99\_eagan\_gmail\_com](https://avatars.discourse-cdn.com/v4/letter/a/dfb087/32.png) [@arules99\_eagan\_gmail\_com](https://forums.plex.tv/u/arules99_eagan_gmail_com)\
**Post date:** [November 13, 2021, 8:30pm UTC](https://forums.plex.tv/t/plex-server-on-pc-unable-to-transcode-4k-mkv-files-roku-player/757541/3 "2021-11-13T20:30:18Z")

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Same experience separate Roku ultras (4k) connected to a 1080p TV -  
and a 4k projector.

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**Author:** ![system](https://global.discourse-cdn.com/plex/original/3X/2/a/2acb9765406f63293d357b4ec509ec39aa28f2ad.png) [@system](https://forums.plex.tv/u/system)\
**Post date:** [February 11, 2022, 8:30pm UTC](https://forums.plex.tv/t/plex-server-on-pc-unable-to-transcode-4k-mkv-files-roku-player/757541/4 "2022-02-11T20:30:50Z")

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