Color Expression with Audio

[Dan Ebberts]

Something like this should work:

threshold = 10.0;

audioLev = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);

above = false;
frame = Math.round(time / thisComp.frameDuration);
n = 0;
while (frame >= 0){
t = frame * thisComp.frameDuration;
if (above){
if (audioLev.valueAtTime(t) < threshold){ above = false; } }else if (audioLev.valueAtTime(t) >= threshold){
above = true;
n++;
}
frame–
}

seedRandom(n,true);
random([1,1,1]) + [0,0,0,1];

You may have to adjust the value of “threshold”.

Dan

[Andrew Pientka]

Hi Dan,

Just wanted to say thank you very much, the expression worked wonderfully.

[Rafael Cruz]

I tried using this expression on the hue setting of the Color Balance (HLS) effect and it didn’t work. The problem seems to be that there are too many values in the code for the property (hue) that i’m trying to manipulate.

Is there another effect that I should apply this expression to in order to have random color change in time with music?

[Dan Ebberts]

Try changing the last line of the expression to this:

random(360)

Dan

[Rafael Cruz]

Thanks Dan!

The change worked.
I had come to suspect that the problem was with the last line but I didn’t know what to do to correct it.

[Deepak Kumar]

Can Anyone Tell Me How This Expression Works. Why Color Reacts To That Value?

[Dan Ebberts]

Which value are you talking about?

Dan

[Deepak Kumar]

Value which is Evaluated by that expression. how we are telling AE to Change Value of Color tone. Why it reacting With Color Shade?

[Deepak Kumar]

Value which is Evaluated by that expression. how we are telling AE to Change Value of Color tone. Why it reacting With Color Shade?

[Kalleheikki Kannisto]

If the question is WHERE does this expression go, it would go to the color value either in the layer itself if it has one (such as in shape layer), or the color value of the fill effect, for instance, if you’re using that to color something that doesn’t have color option in it directly.

Kalleheikki Kannisto
Senior Graphic Designer