# Width (0) and height (0) cannot be \<= 0
**URL:** https://discourse.processing.org/t/width-0-and-height-0-cannot-be-0/5459
**Category:** Libraries
**Created:** [November 11, 2018, 9:43pm UTC](https://discourse.processing.org/t/width-0-and-height-0-cannot-be-0/5459 "2018-11-11T21:43:37Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@ProcessingSuzanne](https://discourse.processing.org/u/ProcessingSuzanne)
#### Post date: [November 11, 2018, 9:43pm UTC](https://discourse.processing.org/t/width-0-and-height-0-cannot-be-0/5459/1 "2018-11-11T21:43:37Z")
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:
```auto
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");
}
```
---
### Author:  [@josephh](https://discourse.processing.org/u/josephh)
#### Post date: [November 11, 2018, 10:31pm UTC](https://discourse.processing.org/t/width-0-and-height-0-cannot-be-0/5459/2 "2018-11-11T22:31:52Z")
Hey,
Please format your code by pressing `Ctrl+T` in the Processing IDE code editor and insert it by pressing `<\>` in the message editor.
---
### Author:  [@kfrajer](https://discourse.processing.org/u/kfrajer)
#### Post date: [November 11, 2018, 10:34pm UTC](https://discourse.processing.org/t/width-0-and-height-0-cannot-be-0/5459/3 "2018-11-11T22:34:08Z")
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
---
### Author:  [@GoToLoop](https://discourse.processing.org/u/GoToLoop)
#### Post date: [November 11, 2018, 10:47pm UTC](https://discourse.processing.org/t/width-0-and-height-0-cannot-be-0/5459/4 "2018-11-11T22:47:00Z")
> [@Problem with slitscan effect for pre-recorded video](https://discourse.processing.org/t/problem-with-slitscan-effect-for-pre-recorded-video/5456/2):
>
> The video library takes some time to “ignite” after we issue a “play” command. Until then, its width & height dimensions are still 0! As a workaround, we can delay() inside setup() until the video is fully ready. This way, when draw() is called back for the 1st time, we’re safe to access the video. void setup() { // ... ( myMovie = new Movie(this, "kat.mov") ).loop(); while (myMovie.height == 0) delay(2); }
---
### Author:  [@ProcessingSuzanne](https://discourse.processing.org/u/ProcessingSuzanne)
#### Post date: [November 12, 2018, 7:50am UTC](https://discourse.processing.org/t/width-0-and-height-0-cannot-be-0/5459/6 "2018-11-12T07:50:22Z")
`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.
---
### Author:  [@ProcessingSuzanne](https://discourse.processing.org/u/ProcessingSuzanne)
#### Post date: [November 12, 2018, 7:50am UTC](https://discourse.processing.org/t/width-0-and-height-0-cannot-be-0/5459/7 "2018-11-12T07:50:56Z")
Thank you! How exactly do I put this in my script?I am very new to processing! I have tried it like this:
```auto
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”.
---
### Author:  [@GoToLoop](https://discourse.processing.org/u/GoToLoop)
#### Post date: [November 12, 2018, 8:02am UTC](https://discourse.processing.org/t/width-0-and-height-0-cannot-be-0/5459/8 "2018-11-12T08:02:40Z")
> [@ProcessingSuzanne](#):
>
> How exactly do I put this in my script?
It’s pretty obviously _video_ is the variable holding the Movie object in your own sketch! 🙄
```java
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();
}
```
---
### Author:  [@ProcessingSuzanne](https://discourse.processing.org/u/ProcessingSuzanne)
#### Post date: [November 12, 2018, 10:47am UTC](https://discourse.processing.org/t/width-0-and-height-0-cannot-be-0/5459/9 "2018-11-12T10:47:18Z")
Now it gives me an error on line
`video = new Movie(this, "Rotatie.mov").loop();`
the error says: “cannot convert from void to Movie”.
---
### Author:  [@GoToLoop](https://discourse.processing.org/u/GoToLoop)
#### Post date: [November 12, 2018, 10:55am UTC](https://discourse.processing.org/t/width-0-and-height-0-cannot-be-0/5459/10 "2018-11-12T10:55:34Z")
You have miscopied `( myMovie = new Movie(this, "kat.mov") ).loop();` from my link like this:
`video = new Movie(this,"Rotatie.mov").loop();` 😷
And I’ve ended up following it in my answer post! 😑
It’s fixed in my post now: `( video = new Movie(this, "Rotatie.mov") ).loop();` 👷♂️
---
### Author:  [@ProcessingSuzanne](https://discourse.processing.org/u/ProcessingSuzanne)
#### Post date: [November 12, 2018, 11:48am UTC](https://discourse.processing.org/t/width-0-and-height-0-cannot-be-0/5459/11 "2018-11-12T11:48:34Z")
It works! Thank you very much!