Queue Video or Animation Based on Audio

[Dan Ebberts]

The basic idea is explained here:

https://www.motionscript.com/design-guide/audio-trigger.html

Assuming you converted your audio to keyframes and your animation is in a time remapped layer, this time remap expression should be close to what you need:

threshold = 10.0;

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

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


Dan

[Kurt Barken]

That should do the trick! Thanks for the help!

[Kurt Barken]

Your expression worked good, but is there any way to accomplish this through Trapcode Sound Keys?

[Dan Ebberts]

Do you mean using just Sound Keys? I don’t think so.

If you mean using the expression with Sound Keys, I think all you would have to do is change the second line to something like this:

audioLev = thisComp.layer(“Black Solid 1”).effect(“Sound Keys”)(“Output 1”);

and maybe adjust the threshold value in the first line, depending on how you have your Sound Keys output set up.

Dan