Quicktime 10 doesn't recognize external video source.

Setting up my new 27" iMac, and discover that Quicktime 10 doesn't recognize an external video source fed in through the firewire port. It is an older Sony analog to digital video converter, and goes through a FW400 to FW800 converter. Quicktime doesn't even "see" that video source as a choice when recording, nor does iMovie, even though it shows up in the System Profiler.
Apps that were ported over from my previous system, however, such as "Video Viewer" and "Final Cut Pro" do see the source, presumably because they were configured to do so on the old system.
Is there some global settings file that I can edit, or something similar that I can do, to make it visible to all apps?
Thanks!

Hi,
Quicktime 7 does recognize the video source, but newer apps, such as iMovie, won't. I'd like to be able to capture to iMovie, but can't without the video source being recognized. Is there a fix?
Thanks!

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