Hi, I try to make a timer that I could combine with my moviefile clip and my particle and make them play at the same time.
the effect i try to recreate is this one :
Thank you for your help 
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Hi Etienne,
I would use an info CHOP set to index_fraction, connected to a movie file in.
Then use this index to drive an animation COMP where you can draw all your curves and keyframes to drive the particle system (or anything else).
Example below.
Timer to movie clip and particle.toe (4.5 KB)
Please keep in mind however that this technique is not rock solid. For example, if your clip changes length (i.e. one second added) all your animation COMP and keyframes will be off.
Perhaps a good place to start though!
I hope that helps!
PS: that math CHOP is there simply to rescale the index_fraction range 0-1 to 0-1000, just to give you more room in the Animation COMP window to work with
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