High Cpu usage while transcoding

[Tux]

Hi,
current situation is as following when i try to wathc a UHD move/show e.g. "House of the Dragon", which cant be direct played on a device (e.g. tablet/smartphone) I get a cpu usage of 95%-100% which obviously indicates that the gpu is not used.

So my setup, as of now:
OS: Ubuntu 24.04
Kernel: 6.8.0-47-generic
CPU: intel 12100
Jellyfin runs in a docker container and is started via systemd
within the following config

Code:

[Unit]
Description=Jellyfin Service
After=docker.service
Requires=docker.service

[Service]
TimeoutStartSec=0
Restart=always
ExecStart=/usr/bin/docker run --name jellyfin --rm --publish 8096:8096 --user 1000:1000 --volume /home/stefan/jellyfin/config:/config --volume /home/stefan/jellyfin/cache:/cache --device=/dev/dri:/dev/dri --device /dev/dri/ --group-add 110 --mount type=bind,source=/media/stefan/mediastorage4/MEDIA,target=/media jellyfin/jellyfin:latest

[Install]
WantedBy=default.target

group 110 = render
with jellyfin user is part of render group

Code:

stefan@mediaserver:/etc/systemd/system$ getent group render
render:x:110:jellyfin,stefan

if i start a stream and check with "intel-gpu-top" I can see the gpu doesnt render and it basically transcodes 100% via the cpu
here is a log from jellyfintranscode https://pastebin.com/NTgPmY6m

If someone could help my why the igpu is not utilized this would be great.
Also if some information is missing let me know
Thx in advance