Okay, I am using the Demo of VV4, and I also expereinced this same problem with VV3. A .mpg file that I might download off the net, will sometimes not be accepted by VV, usually when you highlight a file in explorer in VV, you get file details. But some mpg files sometimes will not have this and cannot load within VV.
But if I run the file through TMPGenc for example, it will then be able to be loaded by VV.
Why are some files mpegs, but not able to be loaded ??