How to disable the audio track in QT Pro Movie Recording

I have a device that allows me to record DVI video (1900x1200 uncompressed) into QuickTime Pro through the Movie Recording function. It all works very well except I am trying to record video only (it's the video output of a medical device, so there is no sound). In QT pro preferences, the choices for audio input are "automatic", built-in microphone", or "line-in". I need the choice of "none" (at these files sizes I need all of the CPU's resources working on the video to improve continuity and frame rate). Does anyone know of a script to disable the audio recording portion, or how I might write one? I have never written script before, but that won't stop me from trying to learn how (or rather, launching into a prolonged period of trial and error).
I am also going to approach this by nagging the video device manufacturer, but they are more Windows- centric (they do support Mac OS X and some Linux platform so all hope is not lost). However, it would be easier if I could have more control over my own destiny, and Mac folk seem to be much more helpful.
Thanks in advance to anyone who may be able to help.

First, thanks for the quick reply.
Setting the audio option to line-in with nothing plugged in yields the same results. The device (which is essentially a continuous frame grabber) doesn't have any audio feed at all, and I think that is what is confusing QuickTime. The file I record generates one video track and several sequential audio tracks that start at roughly every 4 seconds. The movie info say that these are Big Endian Stereo L&R tracks, and that have virtually no file size to speak of. Audibly there is nothing. However, the constant "start over" with the audio is causing 2-3 second skips in the video. When the video is recording contiguously, the frame rates are on the order of 15 to 20 fps, which at 1900x1200 is fantastic for what I am doing (software training video of a Linux-based medical device; nothing cool like Snapz available for this beast).
By the way, I have tried Hack TV Carbon, hTV 0.2 and QT Broadcaster, all which will recognize the device as an input source, but not choose it. These would let me deselect the audio input. As mentioned, I am prodding the device manufacturer for help, too, so maybe they will come up with something to address this.
The other thing is that this device creates a video stream that is transferred by USB2. If it was a Firewire device, I would be all over this with iMovie HD or a HD Video recorder, and just be done with it. Apple may have to come up with some universal driver to accept USB video in since they have dropped FW on some of the new models, but this frame grabber isn't on the list as of now.
No real solution I can find to convert USB to Firewire.
Anyway, I am hoping that somehow I could get into the QT script and just disable the audio recording, like the old "save as Un-editable" script would pullout the "save" function of the QuickTime action.
Of course, dumping the audio tracks after the fact doesn't fix the video; once it's chopped up coming in...
I suspect that the real answer to this issue lies with the frame grabber manufacturer. But, I am still hopeful that the QuickTime Script writers out there (or the Terminal folks) may have something up their sleeves.
Thanks for noticin' me.

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