With the new blackmagic intensity card and experiments on both mac and windows systems, it seems that the jit.qt.grab object captures not as well as its counterpart, the jit.dx.grab. maybe this has not been observed so far because the normal webcams and pal (or ntsc) videocams send lower resoltions than this new capturecards. however, I attached a screenshot of my patch, and provide here the patch itself. This patch has the same effect on windows and mac, while jit.dx.grab captures just fine.
can anybody confirm this?