@Aleron: PAR is resolution agnostic, so mirrorbender's 4320/4739 should be pretty much in the ballpark, but as you saw it isn't, reason? probably your 720x480 capture image and mirrorbender's 710.85x486 buffer active frame are very different. Asumming 710.85x486 is correct your capture card converted/stretched this signal to 720x480, because there's stretching there is a ratio reinterpretation.
Why this yields correct results?? food for thought, ask mirrorbender how he does the thing.
Why this yields correct results?? food for thought, ask mirrorbender how he does the thing.