Video speed control and going backwards

Hi, I can not get the Movie.speed() function to control speed or to reverse the direction. I am running the example from the docs

import processing.video.*;
Movie myMovie;

void setup() {
  size(200, 200);
  frameRate(30);
  myMovie = new Movie(this, "totoro.mov");
  myMovie.speed(4.0);
  myMovie.loop();
}

void draw() {
  if (myMovie.available()) {
    myMovie.read();
  }
  image(myMovie, 0, 0);
}

but the player seems to ignore the call to Movie.speed() does it have to do with the video format, is there a video format that would work?

Thanks for any help sergio