There's a program for windows called Fake Webcam that allows you to show a movie as though it is data your webcam is recording.
Is there something similar for Mac OS X?
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There's an apps, namely, CamCamX
CamCamX allows you to take a prerecorded QuickTime movie and "broadcast" it as if it were a live feed coming from your iSight (or other webcam). CamCamX is compatible with most webcam chat programs, including Skype, Yahoo Messenger and iChat.