I'm trying to capture data from a webcam. The video capture works fine, but no audio is coming through. The webcam does have audio support, as is evidenced when I enumerate the AudioInputDevices (and with the software that came with the camera). When I call RenderStream (using a capture pin and an audio media type), I get an HRESULT of 0x80070057. Do I need to do something special with the capture filter? Keep in mind that I'm pretty new at DirectShow, so I ~could~ be missing something obvious.