Join Chris Meyer for an in-depth discussion in this video Driven by sound, part of After Effects Apprentice 09: Expressions.
One fun trick is to have sound appear to motivate, or move, your animations…inside of a composition.…Well, you can use expressions to help you do that.…I'm going to go back to the Project panel and this time open up comp…08-Audio*starter where we have a speaker, we have a colorful background, and we…have an audio track.…I'm going to press 0 on the numeric keypad to queue up both the video and audio previews.…(audio playing)…Now expressions cannot directly access sound inside a layer.…
I'll type LL to reveal the audio waveform for that layer.…However, there is a very handy keyframe assistant that can take that sound and…create the keyframes for you.…I'll go to Keyframe Assistant > Convert Audio to Keyframes.…This looks at all your audio layers inside of composition and creates one null object--…remember, we said nulls make great master controls--and by pressing U to…reveal keyframes, creates a stream of keyframe values that represent the…loudness of the audio.…
Notice here where the audio is quieter, the values derived are relatively low.…
The After Effects Apprentice series was created by Trish and Chris Meyer. These tutorials are designed for After Effects CS4 through CC, and can be used on their own or as a companion to the Meyer's book, After Effects Apprentice.
- Creating and managing expressions
- Linking together different parameters
- Randomizing a layer's movement
- Looping an animation
- Controlling multiple layers from a single source