I was wondering if anyone could recommend a good video joiner software (freeware). Preferably a program that supports MP4 or MKV. As of right now, I'm using Format Factory, but seems broken. The progress bar / percent indicator never moves, so I have no ideal if or when it will be done. I started joining two clips: Clip 1 39 MB-1:04, Clip 2 30 MB-:49; almost 28 minutes has elapsed and it's not completed.