SOLVED: TVHeadend: jellyfin-ffmpeg exits with 253

[IngwiePhoenix]

I use port mapping; so, bridged.

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Code:

services:
  jellyfin:
    image: jellyfin/jellyfin:latest
    ports:
      - "8096:8096"
      - "8920:8920"
      - "7359:7359/udp"
      - "1900:1900/udp"
    volumes:
      - /mnt:/mnt
      - ./config:/config
      - ./cache:/cache
    security_opt:
      - systempaths=unconfined
      - apparmor=unconfined
    devices:
      - /dev/dri:/dev/dri
      - /dev/dma_heap:/dev/dma_heap
      - /dev/mali0:/dev/mali0
      - /dev/rga:/dev/rga
      - /dev/mpp_service:/dev/mpp_service
    restart: unless-stopped