How to link certain keyframes?

[Kalleheikki Kannisto]

Can you try and explain that in more detail? Right now it sounds like you are describing how keyframes work: If you switch (swap) keyframes A and B locations, you will get a reverse animation. That’s just how keyframes work. So the actual question, I gather, must be something different…?

Kalleheikki Kannisto
Senior Graphic Designer

[Gabriel Silva]

Oks

Oks! Here is the image:

We have the red keyframes, they must be of equal value. I would like that when you change keyframe A, keyframes B and C are changed with the same values ​​of keyframe A automatically.

[Kalleheikki Kannisto]

Ok, I see. You can do so with expressions, but it is somewhat complex, since you need to tell the expression which keyframes should move (by index) and interpolate between fixed and adjustable keyframes between each keyframe pair.

Here’s part of the answer, maybe 1/3 of the full expression needed, although this is slider-based value rather than keyframed. Similar idea though, except that you need to check both the previous and next keyframes at any given time. https://forums.creativecow.net/docs/forums/post.php?forumid=227&postid=30131&univpostid=30131&pview=t

Keyframe value linking would be a nice feature.

Kalleheikki Kannisto
Senior Graphic Designer

[Kalleheikki Kannisto]

This tool might do it:

https://aescripts.com/expression-timeline/

Kalleheikki Kannisto
Senior Graphic Designer

[Tomas Bumbulevičius]

If you select all the keyframes, hover on top of position transformation, and drag the position value, all keyframes are changes depending on the value change you make.

Meaning, if you have two keyframes:

A – 0px
B – 100px

Then click drag the mouse over the position transformation for X, within 50px, keyframes becomes:

A – 50px
B – 150px

This will make sense only if you need to change it once.

Find out more:
After Effects Tutorials: motion design, expressions, scripting.