External ffmpeg process causing disk thrashing

[podonnell]

I don't recall you mentioning what your server OS and specs are in your other threads.  What are the server specs?

If the server is Windows, what does task manager say for the disk usage?

If the server is Linux, use "iotop" to monitor disk usage.  You will have to install that package since it isn't included in any Linux distro I've used.

My server is pretty weak - Windows i7 4790k CPU using VAAPI and an old NVIDIA card that doesn't support NVENC, a 570 I think.
However the disk is a high speed disk used in servers and getting around 350 Mbps read/write in bandwidth tests.

In task manager, typically the disk is 20% or less when running a JellyFin video. But when this subtitle sync process runs, it goes to 100%.