FFmpeg Command-line Tools HIGH disk usage

[gnattu]

I still don't understand your question because everything looks normal to me. This is how it should be working. The file you are trying to stream is 24GB in size and ffmpeg will copy the whole 24GB file and it will take some time and could show as high IO usage. But all the above behavior is working as intended.

What is the actual problem you are having make you believe jellyfin is misbehaving, other than a bit high performance statistics?