unmanageable CPU cost when a video is loaded using video library

pietroLama

I'm trying to do a simple think: when a button is pressed i load a video using the processing video library, each button is associated with a different video, for example button 1 with video 1, button 2 with video 2, and so on. The code works but every time I call a video, also the same i have already load, rewriting the gloabal variable the consume of CPU grows, reaching the 40% after the thrid loading, after 7 video the consume of CPU is near the 100%. An extraction of the code:

import processing.video.*;
Movie movie;
void setup() {
    size(1280, 720, P3D);
    background(0);
}
void draw() {
    //image(movie, 0, 0, width, height);

    if (but1_1==1) {
       println("video 1");
       movie = new Movie(this, "1.mp4"));
       movie.loop();
       movie.volume(0);
  }
  if (but1_2==1) {
       println("video 2");
       movie = new Movie(this, "2.mp4"));
       movie.loop();
       movie.volume(0);
  }
  if (but1_3==1) {
       println("video 3");
       movie = new Movie(this, "3.mp4"));
       movie.loop();
       movie.volume(0);
  }
}

As you can see, it should not be any reason in based on which the CPU consume grows: the instantiated object movie is always rewritten every time a new video (or the same) is loaded. Any suggestions?

kfrajer

You are using this in P3D. is this necessary? How do you display your movies?

Also, if you execute this in draw(), shouldn't it be:

if (but1_1==1 && !movie.isPlaying()) {
       println("video 1");
       movie = new Movie(this, "1.mp4"));
       movie.loop();
       movie.volume(0);
       but1_1=false;
}

Kf

GoToLoop

If memory allows, prefer loading all of the resources a sketch is gonna need before draw() starts. L-)

Why do you create new Movie objects after setup()? :-/
A Movie object is 1 of the most RAM hungry objects btW, AFAIK! :-S

Instead, create an array for them, and you pause() & resume() to pick the active 1. *-:)

GoToLoop

... it should not be any reason in based on which the CPU consume grows:

The video library is simply a binding wrapper for GStreamer, a framework written in C: :-B
https://en.Wikipedia.org/wiki/GStreamer

Java's GC can't touch it! Instead, in order to actually release its hardware resources, we need to explicitly command it via method dispose(). :-$

GoToLoop

And as @kfrajer already asked: Do you really need an OpenGL-based renderer for it? :-\"

pietroLama

hi to all! thanks for the answer, i solved the problem just using movie.stop(); before recall a new object! yes i need opengl because this is just a little part of the code! i use a shader to manipulate the sketch!

pietroLama

i create a movie object in the draw loop because i need to change the video a lot of time, and i have to use like 100 video, so i can't import all in the setup function, is too much memory expansive.