SOLVED: 4k not working

[Kayato]

Hello there.


I'm preparing a new machine, DS425+ to be used only on the local network, mainly on an LG TV. JF works I was able to play 1080p content without any issues and 4K with heavy buffering. Once I enable transcoding, when I start 4K content, it says
"Playback Error
Playback failed due to a fatal player error."
From the log I understand that the problem concerns the "HDR tone mapping", I attach at the end

What I've done so far:
I installed JF via docker on an M.2 SSD (using the Synology_HDD_db.sh script)

I also used the Transcode_for_x25 script to enable transcoding, also enabled by JF, playback/transcoding/QSV
When I launch a content in the log I then find the entry "h264_qsv" which I didn't see before, so I deduce that it is working.
also installed TranscodeDrivers with permissions enabled.

Did I miss a step? Having done all this, it shouldn't give me that error, right? 
Thanks.

Using:  JF: 10.11.11

[TheDreadPirate]

What linux kernel version is Synology running these days on their NASes?

Also, which Jellyfin Docker image are you using? The official image or the Linuxserver image?

[Kayato]

kernel 5.10.55+
I used jellyfin/jellyfin:latest

[TheDreadPirate]

Can you share how you've configured the docker container?

[Kayato]

Code:

services:
  jellyfin:
    image: jellyfin/jellyfin:latest
    container_name: Jellyfin
    volumes:
      - /volume2/Container/Jellyfin/config:/config:rw 
      - /volume2/Container/Jellyfin/cache:/cache:rw   
      - /volume1/Media1/Jellyfin:/media:ro                   
    devices:
      - /dev/dri/renderD128:/dev/dri/renderD128     
      - /dev/dri/card0:/dev/dri/card0               
    environment:
      TZ: Europe/Rome
    restart: on-failure:5
    network_mode: bridge
    ports:
      - 8096:8096
    group_add:
      - "937"

[TheDreadPirate]

I don't THINK this matters, but try changing the devices section to just this

Code:

devices:
      - /dev/dri:/dev/dri

[Kayato]

I also did some tests with different titles, I'd say it worked. I also tried on the TV via the LG app and it worked, a bit with difficulty, but I assume it's because I still have to add RAM.

So problem solved, thank you very much.