VirtualDub is a video capture/processing utility for Windows. It’s main strength is it is small and very fast.
With this program you can cut out the scenes in a movie you want to use in class.
So rather then have the whole movie you can just have a few small files wih what you want.
For experienced users only
Wikipedia entry
Want to edit a file with AC3 sound?
VirtualDub-MPEG2 1.6.9