FCE is DV and DV only. You can’t change format / codec / framesize.
When you say a black box, are you seeing a letterbox (black at top and bottom) a pillarbox (black on left and right) or black all around?
Not sure about FCE, but FCP has an anamorphic check box in the clip info which would solve the first two, the third is a little more puzzling.
Enzo Tedeschi
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Editor
Sydney, Australia