Reference Manual - 1.4.11
IDirectFBVideoProvider   SetSpeed

Set the speed multiplier.

DFBResult SetSpeed (
  IDirectFBVideoProvider   * thiz,
  double   multiplier
);

Values below 1.0 reduce playback speed while values over 1.0 increase it.
Specifying a value of 0.0 has the effect of putting the playback in pause mode without stopping the video provider.

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