we are trying to apply a simple filter to a captured stream using DirectX9 SDK's graphedit

I added Pinnacle DV Capture under capture devices and then connected the capture pin to my filter, then output to the video renderer.

However when I press play I get a blank screen, I am thinking this has something to do with the 2 input pins on the Pinnacle DV Capture box (analog video in for example)

Am I doing something wrong?

We basically have image processing algorithms we want to integrate into a filter and put it between the capture and the rendered so we can do some sort of real time processing on the captured video

help anyone??!?