AVI Capture/Edit with Transparent Background?

[strep]

Is there a way to capture avi files where the background would be transparent. I am trying to capture closed captioning as a avi file, and then mere that captured avi with the corresponding video. The only thing stopping me is that when I try and capture the closed captioning, it saves as an avi with a pink background, but when I originally view that closed captioning, it has no background color. Any ideas on either capturing or editing an avi to get the background to be transparent?

[TIbrO]

The reason it is pink is because that's the color that Windows uses for the hardware overlay color. If you have Premiere, I remember seeing a checkbox or pulldown list somewhere where you can pick a transparency matte color. I usually use a Black Matte. But I am sure I saw those eye dropper things in the dialog box so you could click on the hot pink color and make that as the transparency matte color. Sorry I couldn't be more exact, but it is very late and I am too lazy and sleepy to load up Premiere and a project just to find out the exact steps. But hey, atleast I let you know it is possible!
Sorry for the half-assed reply, but hey, it's better than nothing, eh?