SOLVED: Can't get hardware transcoding to work

[Fardenco]

Hi,
I'm trying to get hardware transcoding to work on my server but I don't know why it won't work.
My Jellyfin server is running in a docker container.
Jellyfin Server version is 10.10.7
The CPU is an Intel Pentium Gold 8505
I added the user to the "render" group, and added the group number and render devices in my docker.compose, following the documentation.
But I have a feeling that the issue is still related to user group or at least to user.
I'm using Portainer. If I open a container console with user "root", running the "/usr/lib/jellyfin-ffmpeg/vainfo" command, returns a list of profile.
But if I do the same thing whith a console with user "1000", then the command returns an error.
Because of this, I guess that the issue is not with the transcoding settings but maybe with the container settings ?

When trying to play a movie with transcoding, the error shown in the logs is

Code:

Failed to set value 'vaapi=va:,vendor_id=0x8086,driver=iHD' for option 'init_hw_device': Generic error in an external library
Error parsing global options: Generic error in an external library

Here is my docker.compose :

Code:

services:
  jellyfin:
    image: jellyfin/jellyfin:latest
    container_name: Jellyfin-HT
    user: 1000:10
    group_add:
      - '105'
    environment:
      TZ: Europe/Paris
    volumes:
      - /volume1/docker/jellyfinht/config:/config:rw
      - /volume1/docker/jellyfinht/cache:/cache:rw
      - /volume1/docker/jellyfinht/logs:/logs:rw
      - type: bind
        source: /volume1/Jellyfin/Films
        target: /movies
      - type: bind
        source: /volume1/Jellyfin/Séries
        target: /tvshows
      - type: bind
        source: /volume1/Jellyfin/Musique
        target: /music
    devices:
      - /dev/dri/renderD128:/dev/dri/renderD128
      - /dev/dri/card0:/dev/dri/card0
    restart: on-failure:5
    network_mode: host

Thank you for your help