I have 9 M4V video files that I created using Handbrake. They are all the same size, same framerate, etc. I try to load all the files into Boilsoft Video Joiner to join them and it claims that the 7th file has a framerate of 48 fps, while the rest have a framerate of 59 fps. I checked the 7th file in MediaInfo and it says that it has a framerate of 59 fps, the same as all the other file.

Does anybody have a clue how I can join these files?

I have tried the join feature in Yamb and all it produces is a movie that when opened in VLC tries to play 9 movie clips at one time.