Track motion with perspective corner pin

Forum|Forum|11 months ago
March 31, 2025
2 replies
869 views

Hello!

I have watched many tutorials on how to use the perspective corner pin tool in order to do a simple screen replacement, every video shows how easy it is to set the 4 corners pins on the 4 corners of the screen.

However when I try to do it myself my corner pins don't move together, they are extremely hard to set and I just wonder what I am doing wrong. Is there perhaps a special key to press when moving them around?

Thanks a lot for your help!

How to

R

Rick Gerard

Community Expert

You will be a lot better off with that shot if you use Mocha AE and do Motion Tracking and Corner Pin tracking.

Maybe this will help:

Because there is little or no detail on the screen, you'll have to track the corners. Here's an old video that shows how to do that. Sorry, there is no audio.

S

sarahbedAuthor

Participant

Hi Rick! Thank you for your help and videos. I am now facing another issue, after tracking with Mocha I want to use the Keylight effect to remove the screen. However when I use the eyedropper tool the screen turns black (rather than transparent). I saw another discussion where the answered the question by saying you should select the comp and not the layer panel, but that doesn't seem to work (I think). Thanks again for your help!

R

Rick Gerard

Community Expert

I would probably not use Keylight. I would use the Stabilized Power Pin method in the first tutorial I shared and overlay the replacement screen on top of the layer. It's less work.

If you really need to apply Keylight to the footage to knock out the screen, apply keylight to the source footage and key out the screen, then add Mocha AE and track everything, including perspective using the corners of the screen, then return to AE, put the replacement layer below the footage and apply Corner Pin tracking to the screen layer. Something like this will do it:

nishu_kush

Community Manager

Thanks for writing in, sarahbed.

No, there's no special key. Does your media file have enough contrast so that After Effects can detect the edges? Please share a screenshot or screen recording so that we can diagnose the issue better.

We're here to help.

Thanks,
Nishu

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sarahbedAuthor

Participant

Hi! thank you so much for replying. Here's a photo of how it looks:

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