In other words, if you use the final horizontal size 720 (rather than 704), the planned (for DVD) height of a 4:3 or 16:9 image must be first adjusted in 720/704 proportion, then in case of anamorphic - cropped to 480 or 576, in case of letterboxed - rounded to a multiple of 16/8/4 (with addition of horizontal borders).
That is because the standard DV/DVD AR's are defined for the limited area of 704x576(480) within 720x576(480).
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