How can I produce a video that loops continuously.

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http://www.linuxquestions.org – I have an AVI which I produced on Blender in which a camera revolves around a model. I want the camera to continuously circle the model over and over again. I know I can do this in a GIF file format, but are there other formats that will do this? What software can I use that would accomplish this? Many thanks, Dave Coventry (HowTos)