Transcoding issue in v10.8.12

[Kevin1109]

Hi, I'm having issues as well with a Docker setup, and at this point I'm at a complete loss of what's exactly going on.

Any time Jellyfin has to transcode, the entire NAS hangs and the only way to solve that is by stopping the jellyfin container. Streaming works perfectly fine without the transcode, but it just seems like it doesn't want to use hardware acceleration no matter what I try.

Here is the ffmpeg log: https://privatebin.net/?eb1210cc55220544...m3haM1gr6R

Judging from the Jellyfin log it seems to correctly identify everything it has to use:
[2025-08-23 22:38:41.953 +02:00] [INF] [1] MediaBrowser.MediaEncoding.Encoder.MediaEncoder: VAAPI device "/dev/dri/renderD128" is Intel GPU (iHD)
[2025-08-23 22:38:41.954 +02:00] [INF] [1] MediaBrowser.MediaEncoding.Encoder.MediaEncoder: VAAPI device "/dev/dri/renderD128" supports Vulkan DRM modifier
[2025-08-23 22:38:41.954 +02:00] [INF] [1] MediaBrowser.MediaEncoding.Encoder.MediaEncoder: VAAPI device "/dev/dri/renderD128" supports Vulkan DRM interop

Is there anything I'm missing? I'm running 10.10.6.