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Smart Tee Filter
The Smart Tee filter has one input pin and two output pins (capture and preview). It should be connected to the output of a capture filter that only has a capture pin, not a preview pin. It 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 only have data coming out of it if the system has the free cycles to provide a preview. Use this filter to preview while capturing on devices where you normally can only do one at a time.
See ICaptureGraphBuilder::RenderStream for additional information.
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