Hardware Transcoding Performance Tanking After a Few Minutes (Iris Xe + Jellyfin LXC - Printable Version +- Jellyfin Forum (https://forum.jellyfin.org) +-- Forum: Support (https://forum.jellyfin.org/f-support) +--- Forum: Troubleshooting (https://forum.jellyfin.org/f-troubleshooting) +--- Thread: Hardware Transcoding Performance Tanking After a Few Minutes (Iris Xe + Jellyfin LXC (/t-hardware-transcoding-performance-tanking-after-a-few-minutes-iris-xe-jellyfin-lxc)

Hardware Transcoding Performance Tanking After a Few Minutes (Iris Xe + Jellyfin LXC - jero537 - 2025-11-01 Hey all, looking for some guidance. Setup: Host OS: Proxmox 9 Container: LXC running Jellyfin (2 vCPU / 2GB RAM — also tried 4 and 6 vCPU, same issue) Hardware: Minisforum NPB7 with Intel Iris Xe Storage: USB-C DAS, 6 HDDs (3+3 mirrored ZFS) holding all media Issue: When transcoding large Dolby Vision files (50–70GB) through Jellyfin, playback starts smooth and the GPU kicks in fine (CPU stays low). But after a few minutes, the framerate slowly drops until it’s around 10–15 FPS, making playback unusable. What I've tried: Switched hardware acceleration: ✅ QSV — proper tone-mapping, but stutters after a few mins ⚠️ VA-API — tone-mapping issues, same FPS drop Tested encoding to H.264 and HEVC — same behavior Increased container CPU/RAM — no change So it seems like hardware acceleration starts off fine and then chokes or throttles. Question: Anyone run into this? Any tips on proper Intel GPU passthrough for Jellyfin on LXC? BIOS setting / driver / VA-API/QSV config / throttling issue? Any direction or known fixes would be super appreciated! RE: Hardware Transcoding Performance Tanking After a Few Minutes (Iris Xe + Jellyfin LXC - sosch - 2025-11-01 Hi, I am having similar issues with my setup: Host OS: Proxmox 9.0.11 Container: Docker Container inside Proxmox VM (Debian 13, latest) running Jellyfin (4 vCPU / 12GB RAM) Hardware: N150 Mini-PC, 16 GB RAM, SSD Storage: RAID-1 NAS 1Gbit Logs and intel_gpu_top proof iGPU passthrough is working fine. Symptoms are pretty much the same as OP: Startup Jellyfin, play any kind of media and the Transcoding works perfectly fine, for a very short time. I have up to 10x transcoding ratio, but shortly after it drops to <1x and it ultimately results in stuttering playback. I have tested both, QSV and VAAPI, but my own benchmarks show QSV a little more performant. I observe high RAM usage, that also not really drops lower, at least according to the Proxmox Monitoring UI.