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4/8/2010

Sets the rate of playback relative to normal speed.

Syntax 

HRESULT put_Rate(
  double 
dRate 
);

Parameters

dRate

Rate to set.

Return Value

Returns E_INVALIDARG if dRateis zero. Otherwise, returns the HRESULTvalue returned from calling IMediaPosition::put_Rateon the connected pin.

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.

Requirements

Windows Embedded CE Windows CE 2.12 and later
Windows Mobile Windows Mobile Version 5.0 and later
Note Microsoft DirectShow applications and DirectShow filters have different include file and Library requirements
For more information, see Setting Up the Build Environment,
Version 2.12 requires DXPAK 1.0 or later