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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, or S_FALSE if not; otherwise, returns an HRESULTerror value.
While calling SetPrerollwith a value of TRUE (1) sets the preroll property, calling IsPrerollon a preroll sample returns S_OK (0).