You should be able to find the kind of thing you're looking for here:-

http://search.gnomedownloads.com/se...tartPosition=16

it's mostly trial programs one that looks promising is :-

http://www.gnomedownloads.com/Graph...l/fxjoiner.html

A digital movie utility that combines multiple movie clips of varied formats into a new movie file.

That should help you on your way........although I'm sure there's loads of programs out there.

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