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Quizzler #1 solution: Stabilization plus masking

From: After Effects Apprentice 12: Tracking and Keying

Video: Quizzler #1 solution: Stabilization plus masking

Our first challenge to you was how would you stabilize this video and then mask it in a way that the Mask Outline was also stable. If you masked the stabilized footage the Mask Outline would bounce around following the corrections created by the stabilization process. Well, there is a couple different ways to solve it. Down in the Quizzler Solutions folder here's one approach. What we did is we broke up the stabilization and masking into two separate comps. First we stabilized the overall video shot and you maybe familiar with this from earlier in this lesson.

Quizzler #1 solution: Stabilization plus masking

Our first challenge to you was how would you stabilize this video and then mask it in a way that the Mask Outline was also stable. If you masked the stabilized footage the Mask Outline would bounce around following the corrections created by the stabilization process. Well, there is a couple different ways to solve it. Down in the Quizzler Solutions folder here's one approach. What we did is we broke up the stabilization and masking into two separate comps. First we stabilized the overall video shot and you maybe familiar with this from earlier in this lesson.

Once we've stabilized the shot we then nested this composition into a second comp, I'll make sure the composition windows forward and tap the Shift key to open the Comp Mini-Flowchart, click on my next composition in line, I've nested stabilization into mask and here I can mask the stabilized footage. At this point this composition doesn't know the stabilization took place previously. It's treating this nested comp player as if it is just another piece of footage that had already been stabilized, and then here's the result.

So that's one way of playing divide and conquer, stabilize in one composition, mask in a second composition. There are other approaches you can use though. For example I could go back to this first composition with a stabilized footage then create another layer such as a solid or shape layer that match the size of the sliced video I wanted to keep. Since you may not have worked with shape layers yet, I'm going to go to Layer > New > Solid, and to make life very easy I'll make it Comp Size, click OK.

Turn off its visibility for now, but keep it selected. Select the Rectangular Mask Tool and drag out a mask shape that matches what portion of this video I want to keep, I'll press V to get back to my Selection Tool, double-click the mask, and then start stretching this outline to make it the shape I want it to be. Once I've done that I'll turn this Solid back on and make it a Track Matte for the video underneath. I'll click Toggle Switches/Modes and set the Track Matte pop-up for the stabilized video to use the Alpha of the solid above.

And now I have my stabilized video matted by a stable mask to solid above it. So there is two different solutions track mattes and nested compositions. The nested composition approach is probably the most flexible, because now it would be very easy to add effects to the mask result, so just a Drop Shadow, etcetera. However, if you need to keep things in one composition the Track Matte does give you an alternative.

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Image for After Effects Apprentice 12: Tracking and Keying
After Effects Apprentice 12: Tracking and Keying

39 video lessons · 14165 viewers

Chris Meyer and Trish Meyer
Author

 
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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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