CPosPassThru::put_Rate

Sets the rate of playback relative to normal speed.

HRESULT put_Rate(
double dRate );

Parameters

  • dRate
    Rate to set.

Return Values

Returns E_INVALIDARG if dRate is zero. Otherwise, returns the HRESULT value returned from calling IMediaPosition::put_Rate on 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.

 Last updated on Tuesday, July 13, 2004

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