Temporal Stabilization for AfterEffects

apply_temporal_mapping.jsx

// Select the layer to apply remapping to
// (the rush or any edited version of the rush as long as
// the in/out timings match the original)

var layer = app.project.activeItem.selectedLayers[0];
var timeRemapping = layer.property("ADBE Time Remapping");

// Remove previous keys
while (timeRemapping.numKeys > 0) {
    timeRemapping.removeKey(1);
}

// Add new keys
layer.timeRemapEnabled = true;
timeRemapping.setValuesAtTimes(correctedTimes, times);

measure_temporal_mapping.jsx

// Select a layer that has an animated scale
// (e.g. a layer on which a tracking with scaling enabled has been applied)

var layer = app.project.activeItem.selectedLayers[0];
var transform = layer.property("ADBE Transform Group");
var scaleProperty = transform.property("ADBE Scale");

var times = [];
var scales = [];
for (var i = 1 ; i <= scaleProperty.numKeys ; ++i) {
    times.push(scaleProperty.keyTime(i));
    scales.push(scaleProperty.keyValue(i)[0]);
}

// process remapping
var minTime = Math.min.apply(null, times);
var maxTime = Math.max.apply(null, times);
var minScale = Math.min.apply(null, scales);
var maxScale = Math.max.apply(null, scales);
var slope = (maxScale - minScale) / (maxTime - minTime);
var correctedTimes = Array(times.length);
correctedTimes[0] = times[0];
for (var i = 1 ; i < times.length ; ++i) {
    correctedTimes[i] = correctedTimes[i - 1] + Math.max(scales[i] - scales[i - 1], 0.001) / slope;
}