I tried using FormatFactory but got another error:
I'm starting to think that the file may be corrupt, because on a second glance several of my other videos in that folder are larger than 4 GB, one is even 183 GB o.o
Assuming it is corrupt, which would explain all of this, is there any way I can recover it? I have some footage in that file that I would really like to use.
And here is the folder showing extensions: