Time Remap: Random

Play back the footage forwards or reverse randomly.

After Effects CS3
Useful things
Expressions

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Apply to the timeRemap property of a layer.

segDur = .5;// duration of each "segment" of random time movement
minVal = inPoint;
maxVal = outPoint - segDur;
seed = Math.floor(time/segDur);
segStart = seed*segDur;
seedRandom(seed,true);
startVal =  random(minVal,maxVal);
seedRandom(seed+1,true);
endVal = random(minVal,maxVal);
ease(time,segStart,segStart + segDur, startVal, endVal);

by Dan Ebberts

(Min. Version: After Effects CS3, Category: Useful things, Type: Expressions)