If you get lots of strange formats and weird incompatibilities you've likely used a video inspector app before, maybe VideoSpec or Media Inspector.
A friend tipped me off to another one that's also FREE called iMediaHUD which is current and pretty spiffy. It even does folders of video clips.
I mention this because I had two clips allegedly from the same camera and one would become out of sync in the Timeline while the other wouldn't. Comparing the two with iMediaHUD showed some differences and I was able to sort it out.
It's free. Give it a whirl if you like to see some interesting specs on your video clips.