The script in this directory generates After Effects compositions with mouth animation.
Download the archive file containing Rhubarb Lip Sync, then extract in a directory on your computer.
On Windows, add the Rhubarb directory (the directory containing rhubarb.exe) to your PATH environment variable.
On OS X, create a symbolic link to the executable (rhubarb) in /usr/local/bin/. You can do that by executing ln -s /rhubarb-directory/rhubarb /usr/local/bin/ (make sure to replace rhubarb-directory with the actual directory).
Copy (or symlink) the script file Rhubarb Lip Sync.jsx into your After Effects scripts directory.
On Windows, that directory is usually C:\Program Files\Adobe\Adobe After Effects <version>\Support Files\Scripts.
On OS X, that directory is usually Applications/Adobe After Effects <version>/Scripts.
In After Effects, select File > Scripts > Rhubarb Lip Sync.jsx. That will open a dialog window where you can specify the audio file with the dialog recording and a number of other options. To get information about any input field, just hover above it with your mouse and you’ll see a tooltip.