| Microsoft DirectX 8.1 (C++) |
Sets the rate of playback relative to normal speed.
Syntax
HRESULT put_Rate(
double dRate
);
Parameters
dRate
Rate to set.
Return Value
Returns an HRESULT value 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.
See Also