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After Effects - How can I change speed without also changing position? - Reverse tutorial
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9,909 Views • Jun 14, 2018 • Click to toggle off description
Thanks to everyone for their help on this one! The best answer (so far) has been pinned below.
This is a hard question to phrase properly.
Basically, I don't want to keyframe the "First Margin" value directly.
I want to do all the animation using sliders, because the thing that really matters is the SPEED at which the 1101000101 animation is moving.
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Views : 9,909
Genre: Film & Animation
Date of upload: Jun 14, 2018 ^^


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RYD date created : 2022-01-25T05:27:11.760341Z
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Top Comments of this video!! :3

@TheDrewol

5 years ago

So I've had to deal with a similar thing before in AE and what I had to do was run the expression for every previous frame + the current frame which made the expression very heavy to run long video lengths but that might not be an issue here. I think this might be what you're after https://pastebin.com/fEKBNMVA Edit: Another commenter here mentioned an article which I think is where I originally found this solution http://www.motionscript.com/articles/speed-control.html

31 |

@Sicsen

5 years ago

After Effects scares the crap out of me so I’m not touching it until you upload a 4-hour long tutorial on it.

55 |

@BartKuipersdotcom

5 years ago

It's because of your expression. You tell the number to be the time * slider + constant. But the time already is counting from frame 1. So you'd need to subtract the 'start time' of the speed from the expression. Expression would then be: x = ( ( time - startTime) * number) + 100. That would fix it for you. But you'd need to determine your startTime. I assume the time thing is frame based, but it could also be seconds based (I don't remember). If it's time based and you start the effect on say, frame 30, you'd get: x = ( (time -30) * number) + 100

23 |

@meemeemeemeem

5 years ago

That is the single best title for a project I’ve ever seen, and here I was thinking that you had a fancy naming system courtesy of Edzel. VISUAL THINGY!

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@rebane2001

5 years ago

That's some After Effects expressions for ya You need the speed to be additive (eg add x every frame) not multiplicational (x times time) I think there's an expression for that, but it's an annoying one to use, I'll have to look it up once I'm back home I don't see a reason to not just animate the position alone, I'd do that instead If you want to discuss this further (or you ever need help) you can throw me a Twitter DM

12 |

@stevenbrown4833

5 years ago

I watched the whole thing even tho I did not get it. AT ALL!

6 |

@namelessguy199

5 years ago

A janky solution u can try, render it at normal speed and speed it up in premier pro

6 |

@TheHimmi50

5 years ago

I have no idea how to edit it but im sure this will be useful one day.

26 |

@merijndenhouting4149

5 years ago

Your expression has (time * number) + 100 in it. time is counted from the beginning of the sketch so once number becomes 900 you're suddenly adding about 1.3 seconds * 900 to that 100.

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@zvava

5 years ago

taran asmr when

3 |

@gregory_wainer

5 years ago

More ASMR, please. JK but I don't have any answers for you though. Sorry

13 |

@motionmix6746

5 years ago

Just tweeted you a link to an expression that works.

4 |

@mateszikora1505

5 years ago

Wow, nice asmr vid.

1 |

@NilsQA

5 years ago

I think It's because you add 900 more via the slider in just one frame, i guess you could fix it if you would stretch the the keyframes for the slider a bit, so the the 0 to 900 don't happens that instantly

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@henrychan720

5 years ago

Another dual Xeon build?

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@Alexanderrox2010

5 years ago

I thought it was the way you're using keyframes... you'd have to delete specific keyframes in which it keeps changing. I could be wrong though.

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@MSEdits_MaxScEditing

5 years ago

The dumbest and easiest way is to render it out and then TimeRemap it... that's what I usually do when I get stuck on a code. XD Maybe even Pre-Compose multiple times to separately apply Visuals for example.

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@B1_GGS

5 years ago

engagement

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@ckohen

5 years ago

Have you tried looking at the curve editor for those keyframes? You probably didn't change it, but you can, and it will allow you to make the whole thing really smooth

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