Science Fair Project Encyclopedia
DirectShow is a large collection of objects for working with multimedia data. The library mainly consists of "filters" - objects which process data - which you'd then connect up into "filter graphs." For example, there are filters which read data from a file, filters which compress/decompress video streams, and filters that render video to the screen. The number of filters is pretty immense, though, and it includes a framework for writing your own if what you want to do isn't present.
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