tools / utilities used to make web based video-editor. ( like animoto or stupeflix )

I am a great fan of the video editing sites animoto (and stupiflex), i enjoy computer graphics and also have that as my major subject at university.

My question is, I have trying to guess what would one need inorder to build such an application.

Do any such open-source / free tools do exist that can give the kind of quality offered by these professionally built开发者_如何转开发 products ?

--I've stumbled upon opensource multimedia framework GStreamer, but i'm have no idea if it can deliver here.

--And have been using OpenCV for academic purposes, would that be a better library ?

UPDATED: 1, my problems are only with the serverside video processing, 2, since this is more of a hobby/adacemic project i'm looking for free & open sources linux based tools/sdks for my task.

Please share your ideas, thanks.

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have you checked out http://www.openmovieeditor.org/?