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Anivyaeeen
Anivyaeeen
Inspiring
January 27, 2017
Answered

Moving Multiple Keyframes using Slider

  • January 27, 2017
  • 1 reply
  • 6158 views

Hey everyone, back again with another question for you guys (I know, I bet you're thrilled)!

I'm back again with another question for you guys! So this question is more about convenience. I've searched all over the internet and have yet to find an answer even when it comes to after effects scripts or plugins, nothing seems to tell me what I want (or I just don't know what to type into google). What I'm wanting to do is move multiple keyframes on a timeline using a, for example, slider effects, let me show you an example of what I am wanting to do.

I'd like to be able to move those keyframes but with a control layer somehow, and possibly move others from other layers as well without having to manually go into every composition and such to move them to their places. This would be much more convenient if I was able to just move them all with, for example, a slider effect that tells the keyframes where they should be. If I could move all of the keyframes that the ending keyframe is moved to the exact same time as all the rest of them that would be amazing. I'm not really familiar with coding, I'm only slightly familiar with some java and mostly python, so obviously I can't figure this out on my own.
TL;DR: I want to be able to move multiple keyframes to a certain ending point in a composition, like 00:03:33:03 for example. If it makes a difference my compositions are all 60 fps.

Thank you so much for being a helpful community throughout my struggles of making things in After Effects. Even if this isn't possible, just telling me it isn't possible is good enough for me. Thank you!

PS: I do have the script called "Rift" but I can't figure out how it would integrate into this "problem"

Thanks,v
Elryst

This topic has been closed for replies.
Correct answer Roei Tzoref

another take on what Rick has suggested is to use a marker to trigger the valueAtTime.

1. set a marker on the layer - this will be your starting point for triggering the animation

2. apply this expression for the property of the layer:

L = thisLayer;

valueAtTime(time-L.marker.key(1).time)

now your animation will start at the marker

1 reply

Roei Tzoref
Roei Tzoref
Legend
January 27, 2017

this seems like something a script could do rather than an expression. have you looked into this? Trigger - aescripts + aeplugins - aescripts.com

Anivyaeeen
AnivyaeeenAuthor
Inspiring
January 28, 2017

Roei Tzoref wrote:

this seems like something a script could do rather than an expression. have you looked into this? Trigger - aescripts + aeplugins - aescripts.com

This is close to what I'm looking for but not quite. I want to do specific keyframes and that plugin only allows me to do a whole composition or a whole layer, basically just time remapping which is easy to do manually anyways. I'm looking for something where I can move multiple keyframes in multiple compositions to a certain point where they all should end, if that makes any sense.

R
Community Expert
Rick GerardCommunity Expert
Community Expert
January 28, 2017

You could use an expression for each property you wanted to control with a slider. The expression would be based on value at time and you would simply add the time value of the slider to the value of the property.

For example let's say that you added Effects>Expression Controls>Slider Control to a layer with animated position values. You would then add an expression to position and then add = effect("Time Slider")("Slider"); to the first line. Now the variable s defines the value of the slider. Now you need to call out time but you want to add or subtract the slider from time so you would add t = time + s; to the expression as a second line. The last thing you would do would be to use the valueAtTime method from the Expression Language Menu >Property list to the expression. That's all there is to it.

Your final expression would look like this:

s = effect("Time Slider")("Slider");

t = time + s;

valueAtTime(t)

This takes the current value of the position and offsets by the number of seconds you dial into the slider. Simple as that. You don't need to build an array because all your are doing is modifying the value at time.

You can use this on any property that you are animating with keyframes. If you have also added an expression to the property that you want to slide around in time then you need to define a variable for the array you are driving (if you are driving an array) and then put this part of the expression at the end. There are times with this will not work with other expressions.

There is nothing keeping you from using one slider to drive every animated property on a layer, you'll just have to add the same expression to each property.

If you wanted to use the slider to count in frames of delay rather than seconds then you would add in a time/thisComp.frameDuration to the mix and a little more math. I'll let you figure that one out on your own.

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