DirectShow - why isn't Fillbuffer called

mechi

Hi!
I've learnt alot on this site.
I'm writing my own source filter which is based on Vivek's VCam (from TMH's site). I'm also using the SDK's Ball example. From both of these samples I see that CSourceStream calls the filter's FillBuffer routine.

Once I started to run my filter and have the camera send frames (over the USB), I want for each frame to call the FillBuffer. At the moment the FillBuffer isn't getting called at all. I went into the source.cpp code (definition of CSourceStream) but i couldn't figure out what is the trigger for calling FillBuffer.

Any help would be appreciated.
Thanks,
Mechi

Hi!
OK - I figured out that FillBuffer isn't called cuz my filter didn't start previewing (pMC->Run() from Amcap wasn't called).
But I still ask - once I start Previewing and Capturing, how can I call Fillbuffer with the new sample?
Mechi

FillBuffer is called automatically with data from buffer once pControl->Run() is called