Smart Tee Filter

The Smart Tee filter has one input pin and two output pins (capture and preview). You should connect it to the output of a capture filter that has only a capture pin, not a preview pin. The Smart Tee filter will always provide the capture frame out of the first pin (capture pin) and it will also send the frame out of the second output pin (preview pin) if doing so will not hurt capture performance. Thus, the capture pin has high priority and always has data coming out of it, but the preview pin is lower priority and will have data coming out of it only if the system has the free cycles to provide a preview. Use this filter to preview while capturing on devices where you usually can do only one at a time.

For more information, see ICaptureGraphBuilder::RenderStream.