Starting up a Firewire iSight works fine when the .pde is compiled, but if you want to change the settings at any time, the video becomes distorted and zooms into the top left part of the screen. I haven't been able to work around this bug as of yet. The built in iSight is not distorted. I don't know if there is the same problem on the PowerPC computers. I am using an Intel iMac with a built in iSight and a Firewire iSight connected.

To test out this bug, just use the script below and click to change the settings.
Code:

import processing.video.*; 
Capture myCapture; 
 
void setup() { 
  size(200, 200); 
  myCapture = new Capture(this, width, height, 30);
} 
 
void draw() { 
  if(myCapture.available()) { 
    // Reads the new frame
    myCapture.read(); 
  } 
  image(myCapture, 0, 0); 
}
void mousePressed() {
  myCapture.settings();
}