app.project.item(index).layer(index).propertySpec.setValueAtTime(time,newValue)
Description
Sets the value of a keyframe at the specified time. Creates a new keyframe for the named property, if one does not currently exist for the specified time, and sets its value.
Parameters
time The time in seconds, a floating-point value. The beginning of the composition is 0.
ne wVa lue A value appropriate for the type of property being set; see Property propertyValueType attribute” .
Returns
Nothing.