Transcoding not work

[gian2k]

I'm running Jellyfin with the dock container on a DS225+ NAS with a hack script transcoding. 
Transcoding works well with other installation of Jellyfin from SynoCommunity, but not in Docker.

Log transcoding:

Device creation failed: -542398533.
[vist#0:0/hevc @ 0x7f31d42ba200] [dec:hevc @ 0x7f31d429d500] No device available for decoder: device type vaapi needed for codec hevc.
[vist#0:0/hevc @ 0x7f31d42ba200] [dec:hevc @ 0x7f31d429d500] Hardware device setup failed for decoder: Generic error in an external library
Error opening output file /cache/transcodes/a8537e62eaa0d210bfc1afd970206085.m3u8.
Error opening output files: Generic error in an external library


Compose Yaml:


services:

  jellyfin:

    image: jellyfin/jellyfin:latest

    container_name: Jellyfin
 

    environment:

      - PUID=10..

      - PGID=1..

      - IT=Europe/Rome

      #- JELLYFIN_PublishedServerUrl=192.168.1.#

      #note: change TZ to your timezone identifier: https://en.wikipedia.org/wiki/List_of_tz...time_zones

    volumes:


      - /volume1/docker/jellyfin/cachecache:rw

 
      - /volume1/docker/jellyfin/configconfig:rw

      - /volumeUSB1/usbshare1-2usbshare1-2:rw

      - /volumeUSB2/usbshare2-2usbshare2-2:rw

      #note: (:rw = read/write) & (:ro = read only)

    #devices:

      - /dev/dri/renderD128dev/dri/renderD128

      - /dev/dri/card0dev/dri/card0

      #note: uncomment these lines in devices to allow for HWA to work on Synology units with an iGPU

    ports:

      - 8096:8096/tcp

      #- <port-to-use>:8096/tcp

    network_mode: bridge

    #network_mode: host

    restart: unless-stopped