Multiple sources in QT

[Kevin Brooks]

I've been using the Quicktime calls recently, thanks to the example code in
the video capture stack.  I don't need to capture video, just display it
from a webcam - which works fine.  Especially now that I discovered that
Quicktime Broadcaster allows me to use the iSight as my webcam.

But now I have a related challenge:

I¹d like to simultaneously display more than one incoming video source
(either from USB or Firewire).  I don't see a clear way of referring to a
specific video input source in the QT commands.  I see where I can choose a
specific source in the QT preference settings window, which the video
capture stack shows how to do.  But instead I would like to do something
like refer to "video source 1" and "video source 2" in the transcript calls,
without having to bring up the settings window.  Even if I have to refer to
some obscure firewire/USB hardware address or reference ID, that would be
fine.

-Kevin