code: @Override
  	public void setFrameInterval(int num, int denom) throws InvalidValue{
  		synchronized(state){
  			if(state.isStarted())
  				throw new StateException("Invalid method call");
  			doSetFrameIntv(object, num, denom);
  		}
  	}
docs: /* (non-Javadoc)
  @see au.edu.jcu.v4l4j.FrameGrabber#setFrameInterval()