Many DVDs come with preset modes like wide-screen or letterbox.
Wide-screen means the movie will be wider than it is taller (this looks more like a movie theater screen). Letterbox has a black box on top of the screen and one on the bottom. This is a cinematic technique that gives the film a more unique look. PC Theater reads these modes and plays them as they are preset.

Wide Screen:

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Wide-screen means the movie will be wider than it is taller (this looks more like a movie theater screen).

 

Letterbox:

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Letterbox has a black box on top of the screen and one on the bottom.
Since the aspect ratio of movies is rarely the same as the aspect ratio of a television screen, when showing movies on a TV or computer monitor, it is necessary to make sacrifices.

With letterboxing this is no longer the case. "Letterboxing" is a video technique where the film is transferred to video in such a way that no film image is cut off to the left or the right.

The advantage of this technique is that the film images are shown as originally intended by the film's director and does not interfere with their shot composition. However, if you’re viewing this technique on a computer monitor or TV, it can sometimes make the movie appear smaller because the entire image must be shrunk to fit in letterbox format.

If you would like to override either the Letterbox or Wide-screen formats, click on the Stretch to Fill Mode.