Hardware Transcoding Plex Docker Intel N5105 not working

[Rojojue]

I have the Asustor AS6706T NAS (Intel Celeron N5105 with Quick Sync support) and installed Plex Media Server with a docker container.

PMS was installed using this guide with docker compose:

Plex in Docker on a Synology NAS (Hardware Transcoding)

The Plex Media Server itself is running as expected, i can see my whole library. But when i play a 1080p movie on my phone and transcode it to 480p for testing it does not use hardware transcoding and my cpu goes to 100%.

I have Plex Pass and enabled Hardware transcoding in the settings.

Here is my /dev/dri folder:

Furthermore i passed through the /dev/dri folder to the Plex container, but hardware transcoding is not working for me right now.

Here is my docker compose:

I found this in the Plex Media Server log:

Can somebody help me to get the hardware transcoding to work? I have to say i´m new to Linux.

[getbent70]

Did you symlink the /dev/dri?
And, are you running portainer?

[Rojojue]

I have Portainer running. What do you mean by symlink exactly?

I ran the command /dev/dri:/dev/dri under devices in my docker compose.

[getbent70]

@Rojojue

I have Portainer running.

That’s good news!

@Rojojue

What do you mean by symlink exactly?

It’s a required step in the workaround I had to use to get hardware transcoding working on my NAS (reminder: not a Synology, but a TerraMaster. But in docker, the process should be very similar I would bet).

Read the following tutorial here:
https://forum.terra-master.com/en/viewtopic.php?f=51&t=2236&p=12028&hilit=Symlink+dev%2Fdri#p12028

Paying special attention to:
The steps after the following paragraph

The only downfall to running Plex in a docker container is that you don’t have the ability to use hardware accelerated transcoding due to docker not having proper access to the root file system and permissions/access issues to the drivers used to transcode. BUT I think I finally figured out to make this work from docker! It’s working properly for me, so here are the steps I took:

The main point where things may be different is in regard to the needed symlink location…

ln -s /etc/init.d/plexhwtrcd /etc/sc.d/plexhwtrcd

As I’m unfamiliar with the layout of the Synology OS, there may be variations that you have to account for in the process.

But the tutorial by Sportswook is pretty detailed (enough to give you a pretty good idea of what needs to be done (both in the Linux OS, and also in docker [via portainer settings])).

DAC_READ_SEARCH was one of the key settings in docker that got me over the hump.

[Rojojue]

Thank you for your great answer, I will take a look later