[vbat99]

10000 seconds is 166 minutes. Probably at the end of the movie

I over did a zero, I tried different numbers and none worked.

Just tested with a DVD converted to mkv file, and MC successfully is able to create fanart from the file.

So I'm not sure why this isn't working for you.
What's your Media Companion location on your PC?

Can you change out a different video and test getting fanart from the video file?
Or go to an older MC version.

I may look at updating the ffmpeg in MC to the latest version for the next release also.