Fit Composition length to video length over expression

Question

Hey pros! I have a project where I keep replacing video footage in a composition in an automated way. Since the footage is not the same length every time, I need to shorten or lengthen the composition length to the length of the footage.Unfortunately, I can't use third-party plugins, so I have to solve it with Expressions.I already tried to adjust the length via a slider control, but I'm not sure if this is even possible.Here is the code I am working on at the moment:var comp = thisComp;
var layer = comp.layer("run-footage");
var footage = layer.source;
layer.outPoint = layer.inPoint + footage.duration;
comp.duration = layer.outPoint;The composition is called "run". The video layer is called "run-footage". The run-footage layer is the only layer in the composition. The expression above is on the slider control.I work with 1920x1080, 50fps. The video footage is also 1920x1080, 50fps (don't know if this is relevant).Does anyone have an idea what I'm failing at?Thanks for your inputs!Translated with DeepL

Mylenium · Accepted Answer

Again, you cannot change anything about the project structure with an expression. Shifting stuff in time could be done with time-remapping to some degree, but that's another of those things. Why would you, given that even AE's basic Sequence Layers keyframe assistant could do it and there are a ton of other scripts out there as well.

Mylenium

Mylenium · Answer

You cannot change project items with expressions. You will require a script and have to run it every time you replace your layer. I'm sure something like that already exists on AE scripts.com.

Mylenium

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