Expression that automates to duration

[Dan Ebberts]

There are a number of ways to do it, depending on how you’re doing the in/out animation. If you’re using 2 in keyframes and 2 out keyframes, you could do something like this to tie the animation to the layer’s in and out points:

if (time < (inPoint + outPoint)/2){
  t1 = key(1).time;
  t2 = key(2).time;
  v1 = key(1).value;
  v2 = key(2).value;
  linear(time,inPoint,inPoint+t2-t1,v1,v2);
}else{
  t3 = key(3).time;
  t4 = key(4).time;
  v3 = key(3).value;
  v4 = key(4).value;
  linear(time,outPoint-(t4-t3),outPoint,v3,v4);
}

If you’re animating in and out via expression, you’d have to alter those to incorporate the in and out point timing.

[Win Edson]

Thanks so much for this Dan. The expression works perfectly in After Effects. Unfortunately it doesn’t translate to the MOGRT in Premiere. But it turns out there’s a built in feature in AE I wasn’t aware of (it’s years old, so my fault!). It doesn’t even involve expressions, so I posted in the wrong forum (again my fault)

In case anyone reading this was trying to accomplish the same thing as myself, here’s what I did.

The feature I needed was the ‘Responsive Design Time’ (found under Composition) I quickly created an intro and outro, sized it to my animation and exported the MOGRT.

Now the end user can just resize the graphic in the timeline and the speed of the Animate Ins and Outs don’t change.

Thanks,

Win