Hello every one, I’ve found the answer !!!
If you understand french language, you should watch it : https://www.youtube.com/watch?v=gmVZYRGzhYU
otherwise, I explain it to you. It’s a bug from after effects CS6.
Normally youngest versions don’t have it because it has been fixed.
A key to export successfully all your comp is the following one :
you have to have a layer always animated in that way, the export goes to the end.
So, for example, create a solid layer. Put it behind all your layers (create above it a new background to not see it, or do like me, reduice it, like that you can’t see it anymore behind the others layers). On this solid, put the fractial noise effect. At “evolution”, at the t=0, put 0% ans at the end, put 100%. Like that your comp is always animated.
ANd…IT WORKS !:)
So, the problem was not about the framerate. (or maybe finally, but now I can export anyway). 🙂
Thanks for your help Kalle
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