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Informs the renderer that flushing has started.
virtual HRESULT BeginFlush(void);
Return Values
Returns an HRESULTvalue.
Remarks
This member function is called by CRendererInputPin::BeginFlushwhen informed of a flush from the upstream filter. It releases the source thread and signals the start of flushing on the input pin. Any samples received by the renderer when it is in a flushing state will be rejected.