I run a website that allows users to create video collages. I want users to be able to preview their collages before they submit their videos for processing. I've already tried displaying multiple <video> elements; this is very slow and the timing for the previews is always off. Is there a way I can use flash (or a similar technology) to create video previews of video collages before processing (which takes minutes -- allowing users to preview their collages allows users to subclip their clips (another feature on the site) to have the desired timing for their clips). Thanks in advance