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Expression(hold opacity connected to audio keyframes)
So what I’m trying to do with no luck is this. Let’s say we have two layers of footage, and one audio layer – making it a total of 3 Layers.
What I want to do is have the top most layer fluctuate it’s opacity according to the audio keyframes. I’m not really sure about audio keyframes but I’m sure I could figure it out. My problem also is that I don’t want the opacity to be any percentage but 0% or 100%. Aka a strobe effect according to sound.
Just to paint a picture, I have one layer of moving 3d text, and on top of that is the exact same footage, but rendered with a glow.
Any help would be much appreciated because I’m new to expressions and this is a tad bit advanced for me.
Thank you.
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4 Replies
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something like this may work:
min = 0; //set minimum audio level
max = 15; //set maximum audio level
a = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
Math.round(linear(a,min,max,0,1)) * 100‘a’ is the audio amplitude parameter for your audio layer. set ‘min’ and ‘max’ as needed for your audio levels… the layer will be 100% opacity when audio levels are above the midpoint of the audio range, and it will be 0% when levels are bellow that point….
Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW -
Thank you for your help. I will try it out and let you know how it works!
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Hi Kevin.
I have a similar situation to the one expressed above. The difference though is that I want to make the opacity change with the sound of a person talking. I want the image fade in fast when the person talks and I want the image to fade out slowly in the moments of silence.
I was wondering if you could give me advice on this matter.
All the best
Carlos
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You should look into Sound Keys: https://www.redgiantsoftware.com/products/all/trapcode-sound-keys/
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