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DV does not have square pixels so you should not be cropping by the same amount all around. Furthermore, it may (should) or may not include nominal analogue blanking, which means the "active picture width" is only 702 pixels (for PAL, which this is).
You should not separatefields() and then resize vertically - avoid resizing vertically at all, if you can, but if you must, use (at the very least) bob(), or something much better, like yadif() for speed or qtgmc() for best quality. Then use separatefields(), selectevery(4,0,3) (or 4,1,2), and weave() to reinterlace it.
What's the desired output here? A file to play on a computer? DVD?
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