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Preroll property. If TRUE, this sample is for preroll only and should not be displayed.
HRESULT IsPreroll(void);
Return Values
Returns S_OK if the sample is a preroll sample and S_FALSE if not; otherwise, returns an HRESULTerror value.
Remarks
This member function implements the IMediaSample::IsPrerollmethod. It returns the value of the m_dwFlagsSample_Preroll property flag. Preroll samples are not meant to be rendered.