I would like to make a quite simple "special effect" in a short movie : showing "me" two times in the same room (for instance sitting at the same table and talking to each other).
Can I do this with iMovie and how ?
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However if you had either Adobe Premiere Elements or Adobe After effects this effect is a lot easier, and more professional like this you can find those tutorials here (Premiere) and here (After effects)
Have a rummage around the Creative Cow website for good tutorials
For that you need to put the first video if yourself in one layer, and the other one on the layer on top of it, and crop the top one (cropping tutorial). Crop it that the top one will who one of you, and the bottom the other one, when shooting the videos, just make sure that you always stay on one half of the frame (a DIFFERENT half every time).