The world of video is dictated by standards, most of which you never really need consider. You've hit a stumbling block that's specific to creating original animated content. Essentially "you" are the camera and need to make a decision on how you're going to record your footage.
Given that this is a video editing forums, the majority of NTSC-land readers will be used to seeing the familiar 720 x 480 frame size from their NTSC DV Cameras. This is a standard and NTSC DV users need not worry about their frame size / aspect ratio (10:11 or 0.909 for 4:3) as it has been dictated as part of the standard.
I'm not in the industry and therefore do not need, nor have the inclination, to know the technicalities. Suffice to say that source footage from an NTSC DV camcorder does not need to be adjusted to play back correctly as MPEG2 on a TV: 16 pixels of the 720 x 480 are overscanned on the TV, so that the actual display is 704 x 480. 704 x 0.909 is 640, giving a frame size of 640 x 480, which is 4:3.
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