• Adobe After Effects Expressions

  HOW TO EVALUATE NODES OF AUDIO AMPLITUDE IN AFTER EFFECTS?

  Posted by Chouhdry Atif on January 1, 2021 at 2:06 am

  Hello everyone, Happy new year to all of you 🙂

  I am working on a project which is includes something as an audio visualizer. I want an expression which counts the higher and lower node of the AUDIO AMPLITUDE layer, of course I can go and manually check from graph section of AUDIO AMPLITUDE layer but I want to universalize it. I mean no matter what song I put it automatically creates those nodes and then I can link the files to this layer so that they only react to higher nodes.

  Thank you everyone.

  Filip Vandueren replied 5 years, 8 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Filip Vandueren

  January 3, 2021 at 5:08 pm

  Simply go through all the keyframes and keep a tally.

  For example on a point control (convenient, because you can have the minimum on [0] and the maximum on [1] of the point in 1 control)

  posterizeTime(0);
  prop = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");
  min_val = Number.POSITIVE_INFINITY;
  max_val = Number.NEGATIVE_INFINITY;
  for (k=1; k<=prop.numKeys; k++) {
  	val = prop.key(k).value;
  	if (val>max_val) { max_val=val }
  	if (val<min_val) { min_val=val }
  }
  [min_val, max_val]

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