Apologies for the title. I'm struggling to even give a name to what I want to do, let alone figure out how to do it. I teach an exercise class and I want to set up a mac and camera so that the camera records about 15 seconds of footage and then plays it back, and then records another 15 seconds and plays back again. The idea is that the students can perform some techniques and then see what they have done immediately afterwards. Hence the description - delayed mirror. It should be like looking into a mirror that is 15 seconds behind you... I could sit someone next to the kit with imovie but I'd rather not. I want something automatic. I don't really want the footage to be stored, it could be and I'd delete later, but ideally I'd like the second 15 secs to overwrite the first, the third 15 sec to overwrite the second etc. Any ideas? I'm stumped. I'm not even sure what to google for. And I have tried... Hardware Mini DV camcorder (firewire) g4 ibook late 2008 alu mac book Thanks for the use of your brains.