Can you provide your full jellyfin log via pastebin and also provide a file name or timestamp so I can find the logs associated with the playback attempts?
Jellyfin 10.10.6 (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)