Try the GIMP. It has basic animation and video editing capabilities.
I think there is also a video-specific tool that was called Film GIMP
but was recently renamed (and I can't remember the new name).
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MJR/slef My Opinion Only and possibly not of any group I know.
http://mjr.towers.org.uk/ jabber://slef@jabber.at
Creative copyleft computing services via http://www.ttllp.co.uk/
Thought: "Changeset algebra is really difficult."