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If you are using square pixels with a pixel aspect ratio of 1.0 - as you should on a digital computer file since most media apps don't display rectangular pixels correctly- SD DV NTSC should be 640 x 480. That same SD footage was probably originally captured at 720 x 480 in the video camera with rectangular pixels. If you use 720 x 480 frame size with square pixels for your output file, your video will be distorted.
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