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Expression for linking layer duration
hello!
I allready searched the archive but could not find, what i was looking for.
I would like to link the duration or outpoint of a layer to another layer in another composition.
For example, when i trim a layer in „composition a“ to the duration of 125 frames, i would like several layers in „composition b“ to be automatically trimmed to the duration of 125 frames + 25 additional frames.
I could achieve a similar effect by linking the layers’ transparencies together, but i would prefer to do it by trimming to make it more visible to others.
it would be great, if somebody could help me with this.
thanks in advance,
michael. -
5 Replies
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A layer’s Out Point isn’t keyframable, so you can’t control it with an expression. An expression for Opacity is the only choices I can think of.
You could also do it with a script, but it wouldn’t be automatic – you’d have to run the script after you changed the length of the master layer.
Dan
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hey dan!
thanks a lot for the info.
i found a way by linking transparency to a comp marker.
it is not perfect, but it works.thanks again,
michael. -
Can you share the way you’re doing it?
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hey david,
sorry for the delay, been on holiday.
i use an expression on a layers opacity property which is controled by the position of a composition marker in a different composition.
the expression is:
if (time < comp(“ControlComp”).marker.key(“0”).time)+1/25) { 100 } else { 0 }the value “1/25” equals one frame in a 25fps composition. if you have a different framerate, you should adjust this value.
if you have any more questions, don’t hesitate to ask.
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Thanks Michael, much appreciated.
I’ll try it as soon as I ump back into that project.
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