ffmpeg crashing and maybe opening phantom window
I just installed Windows on a new computer and set everything up from scratch. I installed Serviio 0.6.1 and the latest DirectX. My library consists entirely of MKV files. I am having a problem I didn't experience on my last system where occasionally I get a window saying ffmpeg.exe has stopped working (screenshot attached). Also, I don't know if this is related, but every few minutes my current window loses focus but I can't see anything pop-up. If I hit Alt-Space, M (to move a window around), and then use the arrow keys, I can see my mouse pointer move as it moves around an invisible window that stole the focus. When this happens I don't see anything new show up in Task Manager. The only reason I'm starting my search with Serviio is because I can't think of what else would even be accessing ffmpeg, and I'm guessing the problems might be related. This happens all the time, even when I'm not currently streaming anything, so it doesn't seem to be related to processing a transcode job. I have tried quitting the Serviio service and I went a good while without getting the invisible pop-up.
What logs could I provide to help diagnose this issue?
Thank you.
Edit: I have confirmed that the phantom window is due to the same problem. When I hit Alt-Space, if I choose Minimize instead, it adds an icon to the taskbar, and then I can pull that up and see that's it the window saying ffmpeg has stopped working and Windows is searching for a solution.