• Adobe After Effects

  HELP! Motion Tracking

  Posted by Kirk Stevens on March 4, 2008 at 8:08 pm

  First let me explain what it is I’m trying to do.
  I need to motion track a shot that pans & slightly zooms in across a series of 4 newspapers layed out on a table. We only see one “photo” at a time in the frame. I would like to replace the “photos” with moving video.
  Currently I have boxes denoting the corners of the “photo” physically on the newspaper. I am using those corners to track in the AE motion tracker. Everything works & looks great when all 4 boxes are present on screen, my problem lies in when those points hit the edge of the screen. Obviously at this point the computer cant track what it can’t see & my video becomes skewed with each frame. I want the video I will attach to this motion track to maintain aspect to give a realistic feel.
  I’m somewhat new to AE & could sure use someones help.

  Hunter Christy replied 18 years, 2 months ago 3 Members · 2 Replies
• 2 Replies

• 

  Jason Peacock

  March 4, 2008 at 11:36 pm

  https://www.imagineersystems.com/products/mocha-AE/ Mocha is what you need..

  Ahron Rabinowitz has done a tutorial all about it.
  https://library.creativecow.net/articles/rabinowitz_aharon/Mocha_Tut_1.php

  Doing a similar project myself and have spent most the day trying to sort my motion tracking… Latest trial versions of Mocha don’t let you output camera data unfortunately and at £1500+ its a little excessive for the 10sec clip i’d be using it for… Let me know if you manage to find an older version out there..

  Also been trying my hand with Bonjou, but not had the results I found with mocha
• 

  Hunter Christy

  March 5, 2008 at 12:25 am

  you can try one of two things.

  1. delete all of the motion points after the first point hits the edge for the first photo. NOW. track two points (position and rotation) for the second photo edge, apply the motion to a null object, and then parent the first photo to that null. this, in essence, says “once my 4 corner pin gets to the edge, move it off screen based on the motion of something coming next.” repeat for all the other photos.

  2. get mochaAE. it tracks offscreen and has saved me oodles of time. it’s great and a more solid tracker than AE has natively.

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