Frame Accurate Interactive Video Playback - a solution for 1.5.x but not working in 3.x

After much hacking I have made a sketch that does frame accurate interactive video playback. I based this on tips and code from the older processing forums. BUT - it only works in processing 1.5.1 I had to use various workarounds, and I don't know why they work. It is something to do with the conversion from time in seconds to an accurate frame number. A limitation of the jump() command.

I'm posting this code in the hope that it might help others and maybe to find a solution that works in Processing 3.x

here's the code with lots of comments and link to a reliable test video:

/*
 An example of frame accurate interactive video playback
 Tested working for frame accurate interactive viewing of videos at 25fps and 30fps - any length.
 This only works in processing 1.5.1
 I cannot get it working in newer versions of Processing
 This is probably due to the switch to the gstreamer library

 Easiest way to check it's working is to use a movie file with the
 correct frame number printed on each frame so you can spot skipping frames
 as you use the keys: -/+ to navigate.

 The suitable video for this sketch (with it's numbered frames) can be d/ld here:
 http://33dd.com/processing/100_Numbered_frames_30fps.mov
 */

import processing.video.*;
Movie myMovie;
float movieFps=30.00;//fps of the movie - please set to match your movie file
float advanceLength = 1/(movieFps-0.01);//get length of one frame in seconds - and subtract 0.01 (why -0.01 I don't know??)
//this movie is 30fps - but sketch is only accurate if we declare fps as 29.99fps - why??

void setup()
{
  size(640, 320, P2D);//P2D needed for processing 1.5.--
  //size(640, 320);//use this method in processing 2.++ - no more P2D
  background(0);

  //load a movie with visible framenumbers - makes it easier to check accuracy
  myMovie = new Movie(this, "100_Numbered_frames_30fps.mov"); //see link at top for video source
  myMovie.loop();//play the movie
  myMovie.speed(0);//best way to stop the movie - pause() halts the thread - so we must use speed(0)
}

void movieEvent(Movie myMovie)
{
  myMovie.read();
}

void draw()
{
  image(myMovie, 0, 0, width, height);
}

void keyPressed()
{ //use - / +  keys to go back and forward one frame
  if (key == '-')
  {
    if (myMovie.time() < advanceLength)//if movie time < 1 frame jump to start of movie (another hack needed to make it work)
    {
      myMovie.jump((myMovie.time() - advanceLength) % 0);
    } else
    {//for some reason this only works accurately if we jump backwards then forward one frame
      myMovie.jump((myMovie.time() - advanceLength) % myMovie.duration());
      myMovie.jump((myMovie.time() + advanceLength) % myMovie.duration());
    }
  }
  if (key == '=')
  {
    //jump forward by one frame
    myMovie.jump((myMovie.time() + advanceLength) % myMovie.duration());
  }
}