Im developing an application with video and in is showing me a black line in the left or right side of the mx:VideoDisplay component. I tried changing the background to white, and setting alpha border to 0, here is the code:
<mx:VideoDisplay id="vidPartner" width="320" height="240"
What's the default size of the video? Maybe the video has a tiny black line that is getting scaled up resulting in a much more visible black line? I mention this because I had the same problem in one of my videos...