hi guys

i'm trying to make a program wich records a movie from a webcam into one file, then plays that file on half the screen (the other half is still the webcam) while recording a movie to a second file. and so on.
now i've got a nullpointer exception which i don't know where it's coming from and before i had problems with the movie files...

can someone help me, or give me a clew?


int counter=0;
int l=0;
import processing.video.*;
int i=0;
MovieMaker[] mm;
Movie movie0;
Capture cam;
String[] n;

void setup() {
 size(320, 240);
 mm=new MovieMaker[10];
 String[] n={"1.mov","2.mov","3.mov","4.mov","5.mov","6.mov","7.mov","8.mov","9.mov","10.m
ov"};

 for(int i=0;i<=9;i++){
   mm[i] = new MovieMaker(this, width, height, n[i],30,MovieMaker.JPEG, MovieMaker.HIGH);
  }

 cam = new Capture(this,width,height);
 background(204);
}

void mousePressed(){
 mm[counter].finish();
 counter=counter+1;
 movie0=new Movie(this,n[counter]);
 if(counter==10){
   counter=0;
  }
}

void draw() {

 cam.read();
 image(cam,0,0,width,height);
 mm[counter].addFrame();
 
 if(counter>0){
   image(movie0,0,0,width,height);
  }
}

void movieEvent(Movie movie0){
  movie0.read();
}