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Sets the rate of playback relative to normal speed.
HRESULT put_Rate( double dRate );
Parameters
- dRate
- Rate to set.
Return Values
Returns an HRESULTvalue from the call to CSourcePosition::ChangeRate.
Remarks
This property allows an application to speed up or slow down playback relative to the normal default playback speed. A rate of 1.0 indicates normal playback speed. Specifying 2.0 causes playback at twice the normal rate: a video created for 10 frames per second (fps) will be played back at 20 fps, if resources permit. Audio streams played back at above-normal speed increase the pitch rather than drop frames.
Negative rates indicate reverse play. Not all media will support reverse play.