Can't play movie (2160p HDR H265 mkv 90Gb) on Android/LG WebOS/PC Web

[Norrodar]

Hey and thanks for your help!

I'm using a Synology NAS 920+:

• CPU: Intel Celeron J4125, 4-Core, 2.0 GHz (base) up to 2.7 GHz (turbo) 
  
• Ram: 20Gb total (14Gb free to use)
  
• Lan: 2x 1Gbps
  
  

GPU Passthrough:

• The Synology DS920+ does not support direct GPU passthrough to Docker containers as it doesn't have a dedicated GPU, and the integrated GPU of the Intel Celeron J4125 is not designed for such purposes.

My Docker-Compose looks like:
volume2 = M.2 SSD
volume1 = HDD (7200rpm, SHR/Raid5)

Code:

services:
  jellyfin:
    image: jellyfin/jellyfin
    container_name: jellyfin
#    user: uid:gid
    network_mode: 'host'
    volumes:
      - /volume2/docker/jellyfin/config:/config
      - /volume2/docker/jellyfin/cache:/cache
      - /volume1/mediathek:/media
#      - /path/to/media2:/media2:ro
    restart: 'unless-stopped'
    # Optional - alternative address used for autodiscovery
#    environment:
#      - JELLYFIN_PublishedServerUrl=http://video2.lan
    # Optional - may be necessary for docker healthcheck to pass if running in host network mode
#    extra_hosts:
#      - "host.docker.internal:host-gateway"

Update:
I just realized that the devices-entries are missing, so I added:

Code:

    devices:
      - /dev/dri:/dev/dri #optional
      - /dev/dri/renderD128:/dev/dri/renderD128
      - /dev/dri/card0:/dev/dri/card0

Now LG WebOS: Can't play because media is not supported from this device (TV).
Android still the same: Audio, but no image/video