I am new at DirectShow, so some parts of this library i don't understand well. I already see the example DxSnap, but i need to capture frames without previewing it, for futher processing. How can i do it?
you could build one yourself. If you look into the windows sdk 7.0~ folders you can go to samples > multimedia > directshow > and there should be a filters folder that shows you how to make generic filters and do w/e you want