I noticed that if you have the videos in a folder with non-english characters in the name it dont work.

like I had the videos in a folder called "GÖGN" and I got a "Could not open input file E:\GÖGN\whatever.avi" error for every video inside that folder, renaming the folder or moving the videofile outside the folder made badaboom except it.

I'm guessing users with non-english characters in theyr Windows user profile on a single drive computer may experience this especially, unless they have the video in a folder in the C\: root