My experience is that it is a new movie that is 640×480. It goes in 720x480DV and comes out 640x480MPEG-2. When you import it into DV Studio Pro, it’s a square pixel movie. In one scenario, I went into QT and manually changed the frame size back to 720×480. Then, I re-saved the movie. DSP didn’t like this file and wouldn’t import it. This is a real fine mess!