You can choose to output movies in standard (4:3) aspect ratio, widescreen (16:9) aspect ratio, or a custom aspect ratio.
If you are making a movie for DVD, you can choose either standard (4:3) or widescreen (16:9). If you are making a movie to be shown on an High Definition TV, you should choose widescreen (16:9).
To change the aspect ratio for your document
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On Mac OS, choose → or click on the button in the tool bar.
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On Windows, choose → or click on the button in the tool bar.
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Select either Standard (4:3), Widescreen (16:9), or Same as Movie Size in the pop-up menu.
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If you selected Same as Movie Size, then the aspect ratio will match the values entered in the Movie Size section. Enter the desired values there.