Having trouble playing a recorded video stored in an ArrayList

scratchis..

Having trouble playing a recorded video stored in an ArrayList

in Contributed Library Questions • 2 years ago

I'm trying to use GSVideo to record a video into an ArrayList and delete some of its frames. Recording the video works fine, but when I try to step through the images, the program will only display the last frame.

import codeanticode.gsvideo.*;
GSCapture cam;
ArrayList pictures = new ArrayList();
boolean recording = true;
int frame = 0;
void setup() {
size(640, 480);
String[] cameras = GSCapture.list();
cam = new GSCapture(this, 640, 480, cameras[0]);
cam.play();
}
void draw() {
println("Draw: " + frame);
if(cam.available() == true) {
if(recording) {
cam.read();
pictures.add(cam);
frame++;
}
}
try {
background(0);
image((PImage) pictures.get(frame-1), 0, 0, width, height);
} catch(IndexOutOfBoundsException e) {
; //do nothing
}
}
void keyPressed() {
recording = false;
if(key == 'q') {
frame = max((frame - 1) % pictures.size(),1);
} else if(key == 'e') {
frame = min((frame + 1) % pictures.size(),pictures.size());
} else if(key == 'w') {
pictures.remove(frame);
frame = frame % pictures.size();
}
println("KeyPressed: " + frame);
}

The controls (if it worked) are:

Q to step back a frame
E to step forward a frame
W to erase the current frame

Replies(3)

PhiLho

Re: Having trouble playing a recorded video stored in an ArrayList

2 years ago

Moved to Contributed Libraries questions because you use such library, and because answering it need knowledge of the library.
Particularly, I see you add the cam object to the array list, but you should store the image itself instead. Probably a copy of it.
Here, cam is a global object, and all you do is to add multiple references to this object in the list. These are only references, so when you update the object, all entries show the same data.

scratchis..

Re: Re: Having trouble playing a recorded video stored in an ArrayList

2 years ago

But I don't know how to do that...

PhiLho

Re: Re: Having trouble playing a recorded video stored in an ArrayList

2 years ago

Neither me. That's why I wrote that somebody with specific knowledge of the library should answer...

Top Reply