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Direct3D slows down after DirectShow

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Once I execute the IMediaControl features, all my Direct3D rendering slows down, even when I close the program and restart it again without the IMediaControl. The Direct3D works again only when I restart the computer. Probably something to do with memory licking. Is there anyway to clear the memory buffer or something before destroying the IMediaControl? I''ve check the doc but couldn''t find any related function under IMediaControl.

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