I have an old iBook G4 (aspect ratio 4:3) hooked up to a TV screen (aspect ratio 16:9). This means the TV always gets the 4:3 output and is incredibly annoying.
Using the open source MPlayer I am able to set the aspect ratio of movie files to 16:9, meaning they are distorted when viewing on the iBook screen but appear correctly on the TV screen.
However, MPlayer is not as good a player as QT and tends to corrupt the rendering... is it possible to set the aspect ratio of a movie in QT? This could also be solved if it were possible to set the aspect ratio of the entire display on the iBook when the video-out cable is plugged in.