ASF Script Streams in DirectShow
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
When the WM ASF Reader filter is given a file that includes a stream of type WMMEDIATYPE_Script, it creates an output pin for it that can be connected to the Internal Script Command Renderer filter. When you call IGraphBuilder::RenderFile, that filter is automatically added to the graph and connected. When the Internal Script Command Renderer receives a sample containing a script command, it fires an EC_OLE_EVENT event whose lParam contains the script. The application is entirely responsible for handling this event.
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