A PGraphics is not like a PImage, and if you display several PGraphics in the window, it slows the prog a lot, and may not display what you want. (Maybe because of all the property specific to each PGraphic that are considered on each display)

The solution I found is to create a REAL PImage using createImage() + copy() functions.

Code:

1. Movie myMovie;
2. ...
3. 
   
4.   PImage[] imgs = new PImage[n];
5.   
6.   for(int i=0; i<n;){
7.     m.jump(begin);
8.     if(m.available()){
9.       m.read();
10.       PImage p = createImage(m.width, m.height, RGB);
11.       p.copy(m,  0,0, m.width,m.height,  0,0, m.width,m.height);
12.       imgs[i] = p;
13.       begin += step;
14.       i++;
15.     }
16.     else{
17.       ...
18.     }
19.   }