Blink layers in/out

This is a script that is used to make layers blink in and out automatically tracking with their in and out points.

After Effects CS3
Transitions
Expressions

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The keyframes for opacity will look like this:
0,20,0,40,0,60,0,80,0,100 and reverse for the out.

Apply this expression to the opacity:

//applyTo: opacity
// blinks in with 5 blinks
blinks = 5; // The number of times to blink while fading in. you can change this and it will recompute for you

blinkFrames = blinks*2;
inFrame = Math.round(in_point/this_comp.frame_duration);
outFrame = Math.round(out_point/this_comp.frame_duration);
frame = Math.round(time/this_comp.frame_duration);

if (frame < inFrame + blinkFrames){
delta = frame - inFrame;
if (delta % 2 == 0){
0;
} else {
linear(delta,0,blinkFrames,10,110);
}
} else if (frame < outFrame - blinkFrames){
100;
} else {
delta = frame - (outFrame - blinkFrames);
if (delta % 2 != 0){
0;
} else {
linear(delta,0,blinkFrames,100,0);
}
}

by ericwood, Helium14

(Min. Version: After Effects CS3, Category: Transitions, Type: Expressions)