Question to expression. comp length(stretch)

[Dodam's papa]

I searched a lot but couldn't find the answer I wanted.

'A'comp is main, 'B'comp is audio Sauce in 'A'comp

How to set the length of A comp(main comp) to the same length as B comp? How to automate?

I will attach a file with a different length to B comp every time.
I hope that the length of B comp will be adjusted according to the length of the attached file every time I work.

[Mathias Moehl]

Hi Dodam,

Expressions can only change the value of the property they are applied to. They cannot change the duration of a comp or anything else in your project. What you need for this is to write a script. The simples way to write scripts is using my extension Automation Blocks, which is currently in free beta testing phase:

https://aescripts.com/automation-blocks-for-after-effects/

With Automation Blocks you use blocks instead of programming code.

This example searches for a composition with name "B" and for a layer with name "music" inside that comp. It then sets the duration of the comp to the duration of that layer.

[Dodamfafa]

Thanks! mathias.

I'll try the way you told me.

Thank you very much for your answer and help.