Stop facetime from auto-adjusting exposure

Hi,
I've made a timelapse video of a sunrise using the Gawker software and my Macbook Pro. The result is not bad, but it seems like the exposure is constantly being adjusted to the changing lighting conditions. This results in a kind of 'flickering', click here for the video. Anyone got an idea on how to prevent this from happening? There's no such thing as webcam settings in system preferences.
Jonas

I totally understand where II is coming from. I too find it bothersome that in some images, the pre-processed preview is a more pleasing image than the unprocessed RAW. At the same time, it is the unprocessed nature of the RAW image that is the whole attraction and point to shooting RAW. An obvious workaround (if one is willing of course) is to shoot RAW+JPEG so as to either have the JPEG as a "target" reference or final image when suitable. And that is an option I used to employ until I got tired of dealing with the issues of essentially doubling the number of images I was working with.
I do disagree with II's thought that the preview showing up is slowing down any processing of the RAW image. It would seem to me that the whole reason the preview is showing up is that it is a prerendered aspect of the file that pops up while the actual preview rendering is taking place. While I don't claim to have technical knowledge as to how this all works, I would think that LR is simply showing the initial rendering of what the RAW file is telling LR it looks like until LR can actually make it's OWN interpretation. Either way, the process is fast enough that it isn't a huge issue to me on my system. In fact, those images where I see a vast difference between the inital preview image and the LR rendered resolve no slower than the rest.
It is interesting to know that there are applications/utilities out there that will extract that inital preview though. I thionk it would be very cool if LR made use of such a capability more directly as an option.
Anyway, while the frequency of my use of LR so far pales in comparison to that of PS and Bridge, so far I can say that such discrepency between nice looking inital preview and less than so RAW is far less common than it is working with PS and Bridge CS2.

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