A friend gave me a mpg movie file of the movie Spaceballs. While watching it on my computer with windows media 9, the movie seemed to freeze up occasionally even though the counter kept going. When I moved the seek bar on the place where it froze, a picture popped up that wasn't in the movie. I recognized it as a scene from another movie called Ferris Buler's Day Off.
Is it really possible to put two movies into one file so that both movies play at the same time but with one movie seemingly placed "on top" of the other one so that it only looks like there's one movie? If so, how do I go about watching each movie seperately?
I'm really confused. Any help would be greatly appreciated.