[Joss Gitlin]

I finally got it!

This expression checks the past 3 frames to see if they all fall below the threshold, and if so, executes a command.

x = thisComp.layer(“A_BASS”).effect(“Both Channels”)(“Slider”);
threshold = 50.0;

wentBelow = false;
isBelow = false;
frame = Math.round(time / thisComp.frameDuration);
oldFrame = Math.round(time / thisComp.frameDuration) – 3;

d = 3;
n = 0;
while (frame > oldFrame){
t = frame * thisComp.frameDuration;
if (x.valueAtTime(t) >= threshold){
n=100+x;
wentBelow = false;
break;
}
else wentBelow = true;
if (wentBelow){
d–;
if (d < 1) {
n = 102;
break;
}
}
else if (x.valueAtTime(t) < threshold){
wentBelow = true;
}
frame–
}

n

[Joss Gitlin]

Well Dan, I’m ashamed to admit it, but I’m stuck.

x = thisComp.layer(“A_BASS”).effect(“Both Channels”)(“Slider”);
threshold = 50.0;

below = false;
frame = Math.round(time / thisComp.frameDuration);
oldFrame = Math.round(time / thisComp.frameDuration) – 3;

d = 3;
n = 0;
while (frame > oldFrame){
t = frame * thisComp.frameDuration;
if (below){
if (x.valueAtTime(t) >= threshold){
n=100+x;
below = false;
}
else d–;
}
else if (x.valueAtTime(t) < threshold && d < 1){
below = true;
n=102;
d = 3;
}
frame–
}

n

I need the ‘else if’ statement to only trigger when the x value is below the threshold for 3 consecutive frames, which is what I’m attempting to use the d variable for.

[Joss Gitlin]

Gotcha. I saw you use a similar approach on your website for an audio threshold expression. I’ll look into that. I really only need to look back on the previous 3 frames

[Joss Gitlin]

Oops. I had somehow left that extra “*time” in there!

Is it not possible to get the value calculated by the expression at the previous frame? That’s exactly what I need to do…