How did you install Jellyfin? This doesn't look like a deb package install. Is this a portable install? And you're using vanilla ffmpeg 4.4.2? That is way too old. You should be using jellyfin-ffmpeg 6.0.1.
Jellyfin 10.10.1 (Docker)
Ubuntu 24.04 LTS
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)