Intel Rocket Lake Quicksync Transcoding for 4K HDR Broken for Plex on Unraid

[Ocman76]

Server Version#: 1.24.1.4931
Player Version#: Issue occurs on all players.

Background:
It is currently a known issue that Plex is unable to correctly implement hardware transcoding on Intel Tiger Lake CPUs (see this thread). Rocket lake also experiences similar issues and I have been informed that because Tiger Lake and Rocket Lake are separate generations a different support thread should be created to track this issue.

The issue:
Transcoding any 4K HDR content introduces serious artifacts which makes playback impossible to watch. I am running an i5-11400 on Unraid 6.9.2 and using the Linuxserver.io docker which is currently PMS version 1.24.1.4931. Screenshots below:

I am happy to do what I can to help test/troubleshoot this issue. Any help would be greatly appreciated.

[ArturoVF]

Same setup as me, following up

[Jakematt2004]

Server Version: 1.24.2.4973
Kernel Version: 5.14.1
OS: Ubuntu 21.04

Experiencing a similar problem. I’m currently on linux kernel 5.14.1 and no hardware transcoding works (x264 or x265). From what I can recall - transcoding worked with the exception of HEVC when I was on kernel 5.11.0-31.33, but since I really only need transcoding for x265 content I moved off that kernel.

[jayephx]

Is there any hope that this will be fixed in the near future update? This annoyance has caused me to try Jellyfin, which does HDR 4K transcoding perfectly with Rocket Lake. I don’t know really want to switch as I’ve been a long time plex pass user, but it’d be nice to know there is some hope in this being resolved soon.

Using unRAID w/ i5 11400 on Linuxserver docker. With tone mapping off the artifacts are not so bad, random corner artifact flashes, but with tone mapping on, it is pretty much unwatchable.

[Ocman76]

My hope is that when the Tiger Lake issues are fixed it may fix the Rocket Lake issues as well. @ChuckPa has been providing updates in this thread on the status of Tiger Lake.

[furian88]

Got the same issue on unraid 6.9.2, transcoding works but gives the same issue as your picture above with some formats.

So I updated to 6.10, transcoding just does not function anymore…

So don’t try that

I got the i5-11600 btw

[Ocman76]

Thanks for confirming Unraid 6.10 doesn’t work. Sorry to hear it breaks transcoding entirely!

[Presjar]

@Ocman76

Thanks for confirming Unraid 6.10 doesn’t work

Unraid 6.10 RC does work fine for other docker containers accessing QuickSync hardware.

[jayephx]

I tried Jellyfin for fun and it has no problem with Rocket Lake HDR transcoding. It seems to be a Plex issue??

[Ocman76]

Exactly, which is why I started this thread as it is clear that this is a Plex issue.

[rssfed23]

I can’t even get h264/HD transcoding to work on my Rocket Lake box let alone HDR tone mapping
Things were working until a few updates ago, but now…nada!

[Ocman76]

Do you mean software or hardware transcoding? What Rocket Lake CPU are you using?

[furian88]

just updated to the latest plex version. no luck.

I also went back from unraid 6.10 to 6.9.2 due to no hardware transcoding at all.

[ArturoVF]

Can someone test with the new beta build? Changelog says it adds rocket lake support

[Ocman76]

According to the NUC Tiger lake thread the beta has been working well for transcoding. I’m not sure about 4K HDR specifically yet.

[jump1e]

Seems to be working for me on unRaid 6.9.2 using latest LinuxServer Docker, Plex ver 1.25.0.5282 with no config/modprobe.d/i915.conf

Just had three streams going

Gyazo

Gyazo

Gyazo

So far no errors, even had a 4k transcode working for me

[Ocman76]

OMG YES!! I will test as well, thanks for letting us know!

[Ocman76]

Confirmed working! Tested with multiple different 4K HDR files on multiple devices and all played correctly with hardware transcoding, no artifacts

[jump1e]

More than welcome, thank for you my first post tagged as Solution! I think the Plex devs did more than me, haha.

So happy I didn’t have to upgrade to an RC build on my only unRAID.