I'm working with a teacher who uses Apple TV to display presentations on a loop. Unfortunately, though, the Apple people say there's no way to loop videos using Apple TV.
How long is the clip itself ? If possible use QuickTime
or iMovie to make a movie file that is the original clip copy-pasted
over and over for how ever long it needs to loop for.
Unless you must use the Apple Tv any Mac with QuickTime
can loop a video file (command-L).