Time Remapping in After Effects

In Aftereffects, import a clip or import an image sequence.

Create a new composition with these settings.

Control-Click (or Right-Click) on the footage in the timeline and choose Time->EnableTimeRemapping. This will enable time-remapping and add keyframes in the TimeRemap Attribute.

If you unfold the triangle on the left, you will notice that there is now a "TimeRemap" attribute and 2 keyframes to the right. Click on the Graph Editor Button.
With the Graph Editor revealed, you will notice that by default their is a linear animation. The timecode in the middle tells you what moment of the video will be shown at the current time. To Add keyframes you can click on the diamond shape on the left of the screen (be sure that you are not already on a keyframe or it will delete that keyframe).
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Once you add keyframes, you can edit their timing, and the shape of the acceleration curve using the icons along the bottom of the graph editor.

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Double clicking on "timeRemap" will give you the option to change all the keyframes. With one or more keyframe selected, try the Hold setting. This setting is a way to make a sudden change. For example you could turn a video into a slide show, or reorder the pattern of frames in a stopmotion animation.

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One of my methods is to use Time-Remapping to ping-pong (or loop back and forth) short sequences of stop-motion. This can be made a little more organic by not making full oscillations , but making partial oscillations. See below.

To set up for this effect:

1. Set File->Project Settings to Display Style "frames". Click ok.
2. Go to your Composition Settings and make the frame rate of the comp equal the frame rate of your image sequence. For example - if its stopmotion at 10fps - set your comp to 10fps.
3. Enable Time Remapping on the layer. Click on the Graph Editor Button. Click on the "include Property" button (see below).
4. For the Oscillations below - i'm adding keyframes by clicking and draging on the frame number (see below).
5. Once you have a pattern you like, you could copy-paste this pattern to repeat.

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Joshua Mosley 2010