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After Effects Apprentice 12: Tracking and Keying
Illustration by John Hersey

Quizzler #3 solution: Copying a camera's motion


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After Effects Apprentice 12: Tracking and Keying

with Chris Meyer and Trish Meyer

Video: Quizzler #3 solution: Copying a camera's motion

We have one more Quizzler challenge for you to solve. We've already done a Close All to get rid of the previous compositions, and remember your challenge was how to take this handheld camera shot that was originally against green screen, I will zoom back, composite it over this still image but rather than stabilizing the green screen shot, how do you impart the camera motion in that green screenshot on to the background so that the entire composite has the original camera's movement? I will type UU to reveal all changes to this layer.
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  1. 9m 2s
    1. Welcome
      2m 38s
    2. The Tracker panel
      4m 24s
    3. Using the exercise files
      2m 0s
  2. 13m 25s
    1. Warp Stabilizer basics
      5m 59s
    2. Warp Stabilizer advanced parameters
      7m 26s
  3. 30m 6s
    1. Setting up a stabilization
      2m 57s
    2. Track points explained
      5m 48s
    3. Performing a track
      5m 11s
    4. Applying a stabilization
      2m 42s
    5. Cleaning up the results of a stabilization
      3m 0s
    6. Performing a motion track
      5m 57s
    7. Applying the results
      4m 31s
  4. 13m 48s
    1. The Radio Waves effect
      4m 16s
    2. Tracking the mountain
      5m 31s
    3. Compositing the effect
      4m 1s
  5. 24m 28s
    1. Perspective tracking overview
      2m 40s
    2. Tracking to a corner pin
      7m 1s
    3. Improving the composite
      5m 39s
    4. Tracking with mocha-AE
      9m 8s
  6. 31m 49s
    1. Tracking in 3D (new in CS6)
      4m 31s
    2. Creating 3D objects (new in CS6)
      5m 12s
    3. Hanging a poster (new in CS6)
      8m 8s
    4. Adding text (new in CS6)
      5m 33s
    5. Using shadow catchers (new in CS6)
      8m 25s
  7. 16m 46s
    1. Tracking dots
      5m 43s
    2. Dealing with obscuration
      5m 12s
    3. Cleaning up the stabilization
      5m 51s
  8. 12m 40s
    1. Basic keying
      7m 20s
    2. Refining the key
      5m 20s
  9. 13m 32s
    1. Quizzler challenges
      3m 35s
    2. Quizzler #1 solution: Stabilization plus masking
      2m 58s
    3. Quizzler #2 solution: Stabilization plus tracking
      2m 50s
    4. Quizzler #3 solution: Copying a camera's motion
      4m 9s
  10. 12m 28s
    1. Tracking for multiple effect points
      4m 44s
    2. Converting to ray-traced 3D (new in CS6)
      7m 44s
  11. 23m 59s
    1. Legacy tracker advice
      8m 14s
    2. Tracking interlaced sources
      5m 59s
    3. Using garbage masks for keying
      4m 51s
    4. Using the Rolling Shutter Repair feature (new in CS6)
      4m 55s

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After Effects Apprentice 12: Tracking and Keying
3h 22m Intermediate Nov 23, 2011 Updated Dec 12, 2012

Viewers: in countries Watching now:

Explore how to use the motion tracker and stabilizer built into After Effects and shows how to handle a variety of shots. Author Chris Meyer leads a quick tour of the third-party software mocha and demonstrates the workflow for The Foundry's KEYLIGHT, both bundled with After Effects. The course also covers tracking a greenscreen shot with a handheld camera and replacing its background.

The After Effects Apprentice videos on lynda.com were created by Trish and Chris Meyer and are designed to be used on their own and as a companion to their book After Effects Apprentice. We are honored to host these tutorials in the lynda.com Online Training Library®.

Topics include:
  • Understanding motion stabilization and keying
  • Performing a track
  • Applying tracking to effects
  • Keying with KEYLIGHT
  • Replacing images
  • Improving the composite
  • Garbage masking
  • Dealing with interlaced footage
Subjects:
Video Motion Graphics Visual Effects
Software:
After Effects
Authors:
Chris Meyer Trish Meyer

Quizzler #3 solution: Copying a camera's motion

We have one more Quizzler challenge for you to solve. We've already done a Close All to get rid of the previous compositions, and remember your challenge was how to take this handheld camera shot that was originally against green screen, I will zoom back, composite it over this still image but rather than stabilizing the green screen shot, how do you impart the camera motion in that green screenshot on to the background so that the entire composite has the original camera's movement? I will type UU to reveal all changes to this layer.

It has been keyed but I have not yet tracked it. Well, the solution is, rather than stabilize this shot, instead track it and apply the results to the background rather than applying them to the same layer that's tracked. I will double-click to open it up in the Layer panel, I am going to zoom in so I can see the tracking dots better, back up to the very beginning of the shot, and say Track Motion. Rather than a stabilization, I will track Transforms, I will add Rotation and Scale just like we did when we were stabilizing.

Move these track points into position, need to widen them out a little bit here to cover the entire tracking dot, creates my search region a little bit, and remember the placement of this second track point was very important. Make sure I enclose our tracking dot and carefully adjust the search region not to be so large that we get distracted by the head moving in front but not to be so small that we lose track of the dot itself, make sure our options are set correctly, Extrapolate Motion is the secret here, Luminance channel, okay, and we'll track the shot.

So far, this is exactly the same as you did earlier. I see my track didn't work, so I need to make my area a little bit smaller, do that again. There we go! Lock back on, press U to reveal key-frames, get rid of the bad key-frames between here. I will zoom in on the Timeline so you can see where I am doing better, delete, go to my next good Attach Point key-frame which is there, and delete everybody in between.

Now I have a reasonable interpolation. Once I have done that, with my Track Type set to Transform, I am going to make sure that the Motion Target is my other layer, the still image and I can adjust that inside the Motion Target pop up if I need to. Now when I apply, click OK, both the footage and the background have the same camera motion. The problem is, is that the anchor point for my background shot moved off to the side where my first tracking point was. That's pretty easy to solve.

I am going to go ahead and clean things up here by twirling up the footage, looking at just the Transform Properties. I am going to press Shift+8 to add the Anchor Point and scrub the Anchor Point for my background to make sure that covers the entire frame, and I will reposition as desired. Zoom back out of my Timeline, scrub through a little bit here, make sure I don't go out of frame. That looks good, and I will RAM Preview the entire shot. And it will take a little while to calculate because keying plug-ins do take a little bit longer to render.

But once I am basically happy with the composite and the position of my background in relation to the actors, I can attach both layers to say a null object and pick them up and move them together to reframe the entire shot, zoom in, zoom out, etcetera. So there's nothing special about this, the only trick was rather than stabilize, I tracked, and there is the final shot.

Find answers to the most frequently asked questions about After Effects Apprentice 12: Tracking and Keying.


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Q: This course was updated on 12/12/2012. What changed?
A: We added new chapters on the Warp Stabilizer and the exciting new 3D Camera Tracker, and new movies on the Tracker panel, converting to ray-traced 3D, and rolling shutter repair, all new features introduced in After Effects CS6. In addition, there are new sets of exercise files designed for After Effects CS5.5 and After Effects CS6 and a companion movie that shows our premium subscribers how to use the exercise files.
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