Problem with jump function in GlVideo


I’m building a video player based on GlVideo (Ubunut Linux 16.04 Processing 3.4) and I encounter a problem with the video.jump(float) function. The video seems to strangely fall down to fixed positions (8,3s, 16,6s, 24,9s, etc…) depending on the duration of the file.
My code was a bit tricky with ControlP5 progress bars and stuff and to remove any interference, here a simple code based on single video example that shows the same problem :

import gohai.glvideo.*;
GLMovie video;

void setup() {
  size(320, 240, P2D);
  video = new GLMovie(this, "launch1.mp4");

void draw() {
  println (video.time());
  if (video.available()) {;
  image(video, 0, 0, width, height);

void mousePressed() {

This code results in a jump to 9.8765335 instead of 14.0…
If I use video.jump(11.0); It’s the same… Jumps to 9.8765335

But If I use values under 9.0, the jump works perfectly well…

If anyone could explain this limitation, I would be glad!
Thanks by advance,