This call loads my .qtz video composition, and all works well unless
the iSight camera is munged. Then, it issues the "Sequence grabber
initialization failed" error message to the console. My app doesn't
seem to know the difference. In either case, it appears that a
healthy QCRenderer object is returned.
So how can my app tell if the .qtz video composition actually was
able to connect to the camera?
Is there some way I can trap this error in my QC/Cocoa video app,
so I can put up an alert panel to the user? I don't see what QC
component/call is issuing it. Is there a corresponding notification
issued that I could listen for?