Suppose I have a mirror, or a picture on the wall, and I want to run a second video into this.

How could that be achieved? And even in such a way as to correct for perspective?

For example, like in this video.


If you can use a tool like Apple's Motion or FCPX, or Adobe's After Effects, they all have the ability to put the 4 corners of a layer anywhere you want. With Motion or After Effects, you can even track the 4 corners and keep the "TV" image pinned in the right place.

In Motion, you can select a clip and open the Inspector. In the Inspector, press the "Properties" tab. There's a section in the properties called "Four Corner". If you twirl that open, it allows you to set where the 4 corners of the video go. You can put them wherever you like.

FCPX is similar - select the clip, and open the inspector. There should be a section in the inspector named "Distort". This will also let you set the 4 corners of the clip.

In After Effects you can select a layer and apply the built-in "Corner Pin" effect.


This can easily be accomplished using the "picture-in-picture" feature of most editing software. I've used Adobe Premiere and iMovie, and both include that feature. Premiere has the advantage that you can "mask" a layer, so it is not quite rectangular, in order to fit the shape of the mirror.

Make sure the camera for the main scene is on a tripod and does not move at all. If that camera moves, you will need to animate your picture-in-picture video and mask so it appears to stay inside the mirror's frame.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.