AnimeMusicVideos.org

It also says "There are no clips to build." when I try to test export it...

I imported the entire anime to work on making the music vid, so the timeline is over 2 hours long.
After I cut out everything and finished my video, the timeline is still over 2 hours long, though only containing 4 minutes of video/audio.
Is there a way to get rid of it? Or do I even have to?