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Activity Forums Adobe After Effects Audio keyframes only forward

  • Audio keyframes only forward

    Posted by Ness Lange on October 18, 2022 at 1:20 pm

    Hey guys I once found a really neat web page probably created by a user around here that explained how you can convert audio keyframes into an ongoing and not repeating stream depending on the amplitude of the audio. (By default the keyframes are also decreasing and not only increasing as I desire). Do you know what I am babbling about respectively how to retrieve the link to the page? I lost it somehow. The solution seemed a little complicated.

    Filip Vandueren replied 3 years, 10 months ago 2 Members · 1 Reply
  • 1 Reply
  • Filip Vandueren

    October 19, 2022 at 8:54 am

    Add a new Slider to your Audio Amplitude Null,

    Give it this expression:

    amp = effect("Both Channels")("Slider");
    nki=amp.nearestKey(time).index;
    accum = 0;
    while (nki>0) {
    accum+=amp.key(nki).value;
    nki--;
    }
    accum;

    Then, run “Convert Expression To Keyframes”

    It might take several minutes if your music is more than a couple dozen seconds long.

    A script could do it faster.

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