I've had some trouble with the AVI object myself. I wish I could rid of that timeline bar. Honestly, that's the only real issue I have with it.
I echo Lavawaves question about making a Python video, or any type of alternative way to post video in Construct where I can do it without the timeline bar showing. I could always break the video down into frames and then also try to capture mid-frames, but that takes a long time and the quality is never the same as the actual video.