Hello, yes of course, it's because it's not the same codec that your demo uses, I have the Starsat 7300, it works with mpg video formats, I think it's pretty much the same for the 7100 so convert your video file to mpg file (*.mpg) with a video converter; for the sound, the Starsat supports the mp2 format so don't forget to modify that as well; it should work without any problems, good luck!