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I must be busy this morning, 2 posts!
Hi
I have this expression for opacity:
g = thisComp.layer(“Bass 3”).effect(“Both Channels”)(“Slider”);
if (g<5 || g>5) 100 – time*20 else 0
I am trying to get the layer’s opacity to turn on (100%) then fade out over 5 secs if the value from the audio (converted audio keyframes) is greater than 5. But if the value from the converted audio is less than 5, opacity stays at 0%. Does anyone know where I am going wrong?
Thanks, Olly
P.S. Sorry Bert Brown I tried that link and the code didn’t seem to work.
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2 Replies
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Hi olly,
The trouble with expressions is, they recalculate every frame, so the expression does not know that there was a peak a few frames ago.
The solution is to actively look back at every frame for the last 5 seconds to see if there was a frame that peaked.
This seems to work:
prop=thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");threshold=5;
fadeOut=5; // in secondst=time;
while (t>time-fadeOut) {
if (prop.valueAtTime(t)>=threshold) {
break;
}
t-=thisComp.frameDuration;
}linear (time, t, t+fadeOut, 100, 0)
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that works brilliantly! Thanks loads
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