"jit.qt.grab 720 576 in Mac OSX" to "jit.dx.grab in windows XP".

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I usue "ADVC55 Canapus" for convert my analogique signal (JVC capteur) in FW 400. On my mac the picture is perfect with "jit.qt.grab". But on windows XP sp2 with a Demo version of jitter (I use jit.dx.grab) I have a Video noise and Pixelate. My captation is very very Interlace when I mouve... Well the render is very bad. Why?

BEst,

Rasim