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Well, yes I understand that, but it doesn't really answer my question about how to deal with DVD's that require cropping off the black bars.
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I would say use the original size for calculations, because SAR is the heightXwidth of every little pixel, cropping off the black bars won't affect
lets say you have a pice of paper, 100 cm long, 10 cm width, you divide eqaully into 10 cells (similar to pixels), of course 100/10 = 10cm, therefore each box is 10cm x10cm, the sample ratio is 1x1, now cut off one cell, the piece of paper is now 90cm long, 10cm width, but the ratio of each cell is still 1x1, it never change, you can still use the previous equation 100/10 = 10cm , not 90/10.....
but for DAR, it is changed, before you cut, DAR is 100x10, after you cut it is 90x10
This is what I understand about cropping without resizing, hope you can imagine what i'm trying to tell