I shot in front of a blue screen, then used garbage matte and blue keying to remove the blue background, then I rendered another avi. When I put the avi on the timeline with the final background and logo, I ended up with a black background and I can't remember what I did to make the black background transparent when I used this same technique 9 months ago.
Here's how I arranged the tracks on the timeline: Video 2: TV studio background; Audio 2: audio.avi; Video 3: video.avi; video 5: HT logo.
Here's a screenshot of the timeline. Can anyone tell me how to make the black background transparent so that I appear to be standing in the TV studio?