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Maintaining 720x576 size might usefull if you're gonna transcode to DVD or want to keep the highest possible framesize in the final product, otherwise the image is either 4:3 or 16:9 DAR, so resizing is gonna be done eventually at pre or post-processing.
It your using DAR flags for proper AR decoding, than it doesn't really matter if the image is not 720 pixels width.
Just be sure to use mod16 resolutions for better compression.
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