Wanna see how to animate some mouth shapes driven by an audio file? Tutorial on Youtube.
Animating lip sync in AE is easy if you're just using open and close mouth shapes. In order to match 'S' 'F' 'TH' and the like, takes a little more effort.But if you want to use loudness of an audio clip to drive how open or closed a mouth is:
1. Draw your mouth shapes
2. Create a new control layer in AE
3. Add a slider to that layer
4. Add this expression to the transparency (option+click the stopwatch) of each mouth shape
layerNum = 1
control = comp("compname").layer("layername").effect("Slider Control")("Slider");
if(control == layerNum)
{value = 100;}
else
{value = 0;}
5. Change 'compname' to the name of your composition
6. Change 'layername' to the name of the layer you applied the slider to
7. change the variable 'layerNum= 1' to your chosen variable, one for each layer
This number will be the number to which you assign a specific keyframe
8. Right click your audio layer and choose Keyframe Assistant/Convert Audio To Keyframes
9. Select the loudest keyframes on that new layer and set them to 100
10. Select the 75th percentile of keyframes and change them to 75
11. Repeat for 50 and 25 and 0.
12. Copy those keyframes and past them into your control slider.
Turn on your audio and enjoy! After Effects is a lot of fun.