If the footage has been captured from a DV tape, it doesn´t matter if is AVI or QT, will be Interlaced Lower First.
[Rachel Adams] " am I going to have to GO BACK and CAPTURE ALL THESE HUNDREDS of clips now to ensure that?"
No need to recapture, just rewrap the AVI as QT and this is very easy. Open the clips with QT Player and "Save as..".
The new files will be QT instead of AVI and will contain all the original Audio, Video and TC.
rafael
http://www.nagavideo.com