<ol>
<li>Create your keyframes</li>
<li>Select them by holding down <kbd>Shift</kbd>, via box select or simply click the <em>Flare Brightness Property</em></li>
<li>Then hold <kbd>Alt</kbd> and click the stopwatch icon, this will create an expression</li>
<li>Then click the <em>Expression Arrow</em> <kbd>></kbd> and select <em>Property >  <code>loopoutduration</code></em> this will cause that the keyframes to repeat themselves</li>
</ol>

<p><a href="https://i.sstatic.net/zAqCu.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/zAqCu.png" alt="Image"></a></p>

CC BY-SA 3.0
2015-08-17T11:31:17.007Z
I very much appreciate the pictures. Thanks to them, I was able to immediately get it to do what I wanted. I wish After Effects was more clear on how things interacted, though I guess I'll get a feel for it after spending more time with it.
Luke Mayson
CC BY-SA 3.0
2015-09-16T10:03:02.193Z
@LukeMayson should mark this the correct answer, helps Video get out of Beta.
Ryan
CC BY-SA 3.0
2015-08-17T01:36:41.147Z
2015-09-17T11:54:52.287Z
2015-09-17T11:54:52.287Z
Boomkop3
<p>What I want to do is simple conceptually, but I am just not having success with actually doing it.</p>

<p>I am creating a short video snippet in After Effects, as part of a larger presentation. The video is supposed to begin with a blinking light under the title, which then transitions, with a sound effect, to the video itself.</p>

<p>I've worked out the sound effect, the transition, and all of the other stuff - I just don't know how to animate a blinking light. There must be a way to automate turning the opacity on and off - but all of the tutorials I've found date from several years ago at the earliest and presuppose a working knowledge of After Effects that is more in-depth than what I have.</p>

<p>Can someone point me in the right direction? Preferably with explicit steps!</p>

<after-effects><animation><automation>
How to create a blinking effect in After Effects CC?
Luke Mayson
# How to create a blinking effect in After Effects CC?

(Asked by: username_0 on 2015-08-16)

What I want to do is simple conceptually, but I am just not having success with actually doing it.

I am creating a short video snippet in After Effects, as part of a larger presentation. The video is supposed to begin with a blinking light under the title, which then transitions, with a sound effect, to the video itself.

I've worked out the sound effect, the transition, and all of the other stuff - I just don't know how to animate a blinking light. There must be a way to automate turning the opacity on and off - but all of the tutorials I've found date from several years ago at the earliest and presuppose a working knowledge of After Effects that is more in-depth than what I have.

Can someone point me in the right direction? Preferably with explicit steps!

**Tags:** after-effects, animation, automation


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## 1 answers

### Answer by username_1 on 2015-08-17. Score: 4

1. Create your keyframes
2. Select them by holding down `Shift`, via box select or simply click the *Flare Brightness Property*
3. Then hold `Alt` and click the stopwatch icon, this will create an expression
4. Then click the *Expression Arrow* `>` and select *Property > `loopoutduration`* this will cause that the keyframes to repeat themselves

[![Image](https://i.sstatic.net/zAqCu.png)](https://i.sstatic.net/zAqCu.png)

> **Comments:**
> **username_0**: I very much appreciate the pictures. Thanks to them, I was able to immediately get it to do what I wanted. I wish After Effects was more clear on how things interacted, though I guess I'll get a feel for it after spending more time with it.  
> **username_2**: @LukeMayson should mark this the correct answer, helps Video get out of Beta.  

---

