I have "Main Comp" with 30 seconds of time, and inside have:
A footage called "Forest"
I want to replace Footage which can vary of time, being greater, like 59 seconds for example, so I need wich the "Main Comp", also adjusts according to Footage time duration. "Main Comp" staying with 59 seconds.
Thanks.
I try this:
var myComp = app.project.activeItem;
myComp.duration = myLayer.property("Footage").duration
That didn't work because layer objects do not have a duration attribute. The math has to be done manually. Normally you take the layer outPoint minus the inPoint to get the layer duration.
var myComp = app.project.activeItem;
var myLayer = myComp.layer(1); //Assumes layer 1 is your choice
myComp.duration = (myLayer.outPoint - myLayer.inPoint); //Assumes the layer is normal and not reversed
This won't be bullet proof though because a layer can also be reversed, which places the inPoint after the outPoint, so you would need to flip the order. You would say inPoint minus the outPoint.
var myComp = app.project.activeItem;
var myLayer = myComp.layer(1); //Assumes layer 1 is your choice
myComp.duration = (myLayer.inPoint - myLayer.outPoint); //Assumes the layer is reversed
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