## WDM Video Capture

The Video Capture filter is installed with the DirectShow run time. If you have video capture hardware that uses WDM (Windows Driver Model) and you have Windows 98 or Windows NT 5 installed, this filter is available in the Filter Graph Editor when you choose Insert Filters from the Graph menu, under the Video Capture Source category.

Unlike ordinary DirectShow filters, special category filters, such as Video Capture Source filters, can work with more than one device. When DirectShow is installed, it will look for devices installed on your computer that work with the special category filter and list the options in that category. For example, in the Video Capture Source filter category, DirectShow will list all the video capture cards installed on the system. You then need to choose which device to use.

The WDM Video Capture filter supports the interfaces and property sets of the WDM capture drivers. It exposes the IAMAnalogVideoDecoder, IAMVideoProcAmp and IAMCameraControl interfaces to applications. Depending on the underlying hardware, the filter exposes one or more output pins that output compressed video, uncompressed video, timecode, and closed captioning data. The output pins expose the IAMStreamControl interface, and in the case of compressed video, the IAMVideoCompression interface as well.

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