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Passes an EC_VIDEO_SIZE_CHANGED message to the filter graph manager.
virtual HRESULT OnVideoSizeChange( );
Return Values
Returns an HRESULTvalue.
Remarks
A video renderer should call this member function each time the video size is changed; this will typically be called once after initial connection. If the renderer can support dynamic format changes (from 320 x 240 to 160 x 120), it should also call it after each change.