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Receives notification of entering the flushing state and passes it downstream.
virtual HRESULT BeginFlush( );
Return Values
Returns an HRESULTvalue.
Remarks
By default, this member function calls the CBaseOutputPin::DeliverEndFlushmember function on the output pin to send the BeginFlushnotification to the next filter. Override this member function if you are using queued data or a worker thread.