Width (0) and height (0) cannot be <= 0

Processing Libraries
1

I am working on a very simple BackgroundSubtraction code on processing. In the beginning everything was woking fine but now I get the “Width (0) and height (0) cannot be <= 0” error every time I try to play the code. Here is my code:

import gab.opencv.*;
import processing.video.*;

Movie video;
OpenCV opencv;

void setup() {
  size(1920,1080);
  video = new Movie(this, "Rotatie.mov");
  opencv = new OpenCV(this, 1920,1080);
  
  opencv.startBackgroundSubtraction(5, 3, 0.5);
  
  video.loop();
  video.play();
  background(255);
}

void draw() {
  //background(255);
  //scale(2);

// image(video, 0, 0);  
  opencv.loadImage(video);
  
  opencv.updateBackground();
  
  opencv.dilate();
  opencv.erode();

  
  noFill();
  stroke(122, 179, 216);
  strokeWeight(0.5);
  //noStroke();
  for (Contour contour : opencv.findContours()) {
    //float fil = map(contour.getPoints().size(),0,1000,0,255);
    //fill(0,150);
    contour.draw();
    
     //fill(0,10);
    //contour.getConvexHull().draw();
    
    
      //fill(0,10);
    //contour.getPolygonApproximation().draw();
  }
   
  }


void movieEvent(Movie m) {
  m.read();
  
  //saveFrame("output1.1/standpunt_####.png"); 
}
2

Hey,

Please format your code by pressing Ctrl+T in the Processing IDE code editor and insert it by pressing <\> in the message editor.

3

What line gives you the error?
We don’t have your resources so we won’t be able to reproduce the error.
Also, you need to format your code.

Kf

4
1 Like
6

opencv.loadImage(video);

This line gives the error. Here is also the sketch folder from my file. The videos I’m using are in the data folder.

Schermopname%20(99)
Schermopname (99).png866×469 7.68 KB

7

Thank you! How exactly do I put this in my script?I am very new to processing! I have tried it like this:

void setup() {
  size(960,540);
  video = new Movie(this,"Rotatie.mov").loop();
  while (myMovie.height==0) delay(2);

But then it gives me the error: “cannot convert from void to Movie”.

1 Like
8

It’s pretty obviously video is the variable holding the Movie object in your own sketch! :roll_eyes:

import gab.opencv.OpenCV;
import processing.video.Movie;

OpenCV opencv;
Movie video;

void setup() {
  size(960, 540);

  noFill();
  stroke(122, 179, 216);
  strokeWeight(.5);

  opencv = new OpenCV(this, width, height);
  opencv.startBackgroundSubtraction(5, 3, .5);

  ( video = new Movie(this, "Rotatie.mov") ).loop();
  while (video.height == 0)  delay(2);
}

void movieEvent(final Movie m) {
  m.read();
}
1 Like
9

Now it gives me an error on line
video = new Movie(this, "Rotatie.mov").loop();

the error says: “cannot convert from void to Movie”.

10

You have miscopied ( myMovie = new Movie(this, "kat.mov") ).loop(); from my link like this:
video = new Movie(this,"Rotatie.mov").loop(); :mask:

And I’ve ended up following it in my answer post! :expressionless:

It’s fixed in my post now: ( video = new Movie(this, "Rotatie.mov") ).loop(); :construction_worker_man:

1 Like
11

It works! Thank you very much!