Keep in mind that the resolution's AR is not necessarily the display's AR: DVDs are 720x480. That is a AR of 1.5. The AR of what you see depends on the device you are displaying it on obviously. 720x480 could be displayed as 1.33:1 (4:3 or "full screen"), 1.78:1 (16:9 or "widescreen) or something different even (depending on your setup).
Just to clarify / confuse some more about those "square pixels"
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