Have a look at page 75 from the Script UI for Dummies pdf: http://www.kahrel.plus.com/indesign/scriptui.html
And page 119 of the javascript tools guide cs6. The thing you want to look for is addEventListener.

Good luck! Oh, and please post your progress. Very much interested if this works!

Hi Mike, can you give a coarse description of what you need?

The footage does get trimmed, but you can easily trim the comp by reading the footage duration with .outPoint (or .duration if the footage starts at 0) and then set the comp's .duration to it. Page 92 and 31 (of the AE CS6 Scripting Guide), respectively.

I don't see anything extremely hard going on. Should even be quite a simple script. The only thing that stands out is the "open replace footage dialog", you would have to do this with a file browser, since you can't open the actual dialog.

You actually already used it in your expression on the mainComp. But for the newMask:

The error refers to: newMask.maskPath.canSetExpression = true; You're trying to set this, while it's read only. You could use it in an if statement with double equals (==) to check if you can set the expression. But if you're the only one to use it, you know the path can take an expression, so you m...

Yes, I'd probably use Jeff's method, like I did here: viewtopic.php?f=3&t=2146 But that would be the Object method. What is it you mean exactly by closure?

Quick Loop: adds a Time Remap to the selected layers adds a loopOut("cycle"); to the Remap sets a new keyframe before the last and removes the last (blank) keyframe So that the layer loops smoothly without a blink in between each loop. A friend of mine requested this one, because he's abou...

Thanks for your feedback! Didn't know about that shortcut yet and it works very well. I'll use it from now on :) I'm not sure if I'll continue working on this, since it was just made for learning purposes. Might work on an advanced Sequence Layers instead. But your AVItem suggestion sounds challengi...

Oh, nice! Didn't know you could use .selected with layers as well.

You can't select a layer, so you'd directly have to go into moving the layers in the timeline. Is this a fixed value every time?

The Adobe thread can be found here:
http://forums.adobe.com/message/4193615#4193615

(Just for reference)

It works for me. Did you restart AE to clear all the vars?

On the Adobe Forums I came across this insane reference. It shows tons of code samples!
http://www.kahrel.plus.com/indesign/scriptui.html

Original post:
http://forums.adobe.com/message/4343977#4343977

According to this thread: http://aenhancers.com/viewtopic.php?f=11&t=1929&p=7052&hilit=mask+vertices#p7052 You can't access vertex info with expressions (last post). You might want to have a look at this post: http://aenhancers.com/viewtopic.php?f=6&t=1423&hilit=mask+vertices And...