This may help some of you troubleshoot your problems, helped me.

I'm running...
Win XP Pro
Logitech QuickCam 4000
WinVDIG 1.0.1
Quicktime 7.0.4
Processing .99

I was able to get my video to work ok in QTCap after switching the source, but processing was defaulting to another source at runtime.  I remembered having this issue a long time ago and dug back through the old alpha forums and found a way for processing to find the first available/working source.

-------------------------------------------------------
import processing.video.*;
Capture video;

void setup()
{
 size(320, 240);
 framerate(30);

 
 try{
   quicktime.QTSession.open();  
   quicktime.std.sg.SequenceGrabber sg = new quicktime.std.sg.SequenceGrabber();
   quicktime.std.sg.SGVideoChannel sc  = new quicktime.std.sg.SGVideoChannel(sg);
   quicktime.std.sg.VideoDigitizer vd  = sc.getDigitizerComponent();  
   println( "dv.getNumberOfInputs :" ); println( vd.getNumberOfInputs() ); println();
   //change line below to set input source
     vd.setInput(1);
   //
   println( "dv.getInput :" ); println( vd.getInput() ); println();
 } catch (Exception e) {
   e.printStackTrace();
 }

 // Using the default capture device
 video = new Capture(this, 320, 240, 30);
 
 background(0);

}


void captureEvent(Capture camera)
{
 camera.read();
}

void draw()
{
 image(video, 0, 0);
}
-------------------------------------------------------

I have three available sources:

0 - ATI s-video (default)
1 - QuickCam 4000 (USB)
2 - Samsung mini DV (Firewire)

Nothing plugged into 0 and 2 making 1 the only available source with a signal, so I set vd.setInput(1);

Hope this helps.

I just got my quicktime working again, i found out the problem, werid it never occured to me before...

the default capture example still doesn't work for me because of unknown issues, but i also had problems with this code:

wcam = new Capture(this, "QuickCam", 40*2, 30*2, 10);

and when i removed the "QuickCam" part, it worked, (i'm rejoicing now).

weird luck

all good, i just want to get this stuff working.. i wish the quicktime stuff weren't such a headache. and i updated the faq yesterday with a lot of the new info we've managed to figure out over the last few weeks/months.