- Sometimes as you work, you may find yourself
wanting to mix speed effects.
Going from natural motion to slow motion.
And you don't want it to be abrupt,
you want a nice ramping in and out.
Well, this is where After Effects excels.
In our next project here,
we've done some variable speed effects.
Now, in the timeline here,
you can see some keyframes
with a property called "Time Remapping."
If we click on the graph here,
it's a little easier to see what's happening.
Now, you can look at time.
And instead of it being linear,
I see that it goes at one speed,
which is sort of normal time,
and really stretches out,
and then goes at another speed.
This allows us to really change things.
To make this work, just select the layer
and choose "Layer," "Time," "Enable Time Remapping."
And you'll see, what it does
is adds a couple of keyframes initially.
I usually suggest you go into the
composition settings here,
and add a few extra seconds to the timeline.
Just increase the duration.
Now, there's room afterwards,
and you see that you can even drag this out.
This material just becomes a freeze-frame
after that last keyframe.
Now what we can do is add keyframes in.
So, right here, when he's about to jump,
I'll add a keyframe.
Don't click on the stopwatch
because you don't want to get rid of the existing ones.
Now, let's drag through...
Like there.
And add another one.
If we look at the velocity graph,
you see everything is still moving
at a continuous rate.
But what I want to do is move these down.
So if I lasso these remaining frames,
and pull them to the right,
what I've just done is created a slow-down
in the middle here.
Normal time,
slow time,
back to normal.
You can really see this again
if you look at the velocity graph,
and get a good idea of what's happening
by looking at the curve.
Now what we can do is change this.
For example, I can right-click
and choose "Ease Out."
And on this next one, right-click
and choose "Ease In."
And you'll see that it creates a nice ramping effect
where it changes speed more gradually.
You can also right-click on any of these
and change these, and change the keyframe velocity.
Time remapping is a little tricky,
but not so much if you just remember
that the keyframes are no different
than any other keyframe.
If you thought of them as position keyframes,
it makes sense, or opacity.
These just happen to be keyframes
that relate to frames of video.
So if you spread them apart, it's going to slow down.
If you move them closer together, it's going to speed up.
And if you mix and match,
you're going to get variable speed.
I can go ahead and choose different options here,
such as "Ease In" and "Ease Out."
And you see the different curves.
This creates a nice ramping effect.
Additionally, you can click on one of these
and play with the velocity graph if you want
to create different types of motion effects.
Now, you'll see that it's going at normal speed,
then dramatically slows down,
and then will resume regular speed again.
Now, I recommend that you do these previews
without taking advantage of the
advanced frame blending initially.
This will help you get a good idea on the effect.
How it's working with the general timing.
But, for the best results, do click on frame blending.
Make sure it's enabled,
and even go with the advanced frame blending,
so you get the morph effect.
Now, let's take a look.
You see here that he basically stops, freezes,
because of the flat line here,
and then ramps in.
If I didn't want that to pause so much,
we could just ramp that up, like so.
And you can even play with these curves,
and create an S curve,
if you want something to reverse
and change direction.
But in any case, you see
the dramatic change in motion effect,
as it effectively almost freeze-frames,
then it's going to resume back to normal speed.
Remember, you can use "Ease In" and "Ease Out,"
or other options like "Easy Ease,"
or keyframe interpolation to change this behavior.
But this allows you to create really cool effects
where the motion is changing.
You can use this for music video effects,
or to remap the action specifically
to things like narration or music.