This is what I figure: Since time displacement is relative, you need to counteract it in the displacement map itself.
For this, you’ll need to combine two displacement maps and do some math.
One map is a flat color going from 75% (light) gray to 25% (dark) gray from the start of the animation to the end (animate the fill effect color for instance). This is used to counteract the time moving forward, and it is 50% of the full white to black range. So, if your animation is 10 seconds long, you would set the time displacement value to 10 seconds and that way, if you were to use just this one map, you would get a motionless animation as the time displacement would progress backwards at the same speed as the time progressed forward.
The second map is your desired time displacement map, which you would overlay (in Overlay mode) on the first one. The opacity with which you overlay the second map would affect the additional effect it will have.
Use the combination to drive a single Time Displacement effect, and you will get an “Absolute” time displacement.
Kalleheikki Kannisto
Senior Graphic Designer