The standard procedure is to sequence the visemes (mouth shapes) in a pre-comp with a few frames for each, then time remap keyframe that pre-comp to match the mouths to the dialog. I recently did a project where I used an expression control slider to change the time-remap value, which made the syncing go very quickly. You just set Toggle Hold Keyframes, and drag the slider to match each phoneme. Another cheat is to put text in the precomp showing the sounds (F, V, etc) that go with each viseme so you can select them very quickly, then turn off the letters before you render.
I don't really think the blending of the mouths is necessary--try it without first. In traditional 2D animation this is almost never done.
Thanks for the speedy response, NoSleep
It never occurred to me to create a separate comp just for all the head mouth shapes. (makes sense).
Todd, Thanks for all the links! (..will definitely be reading these)
Strange.. I had initially did a search of "Lip sync" in the upper & middle search areas, and received some responses but they were from other programs..
How did you obtain so many "lip sync" results that pertain just to After Effects?...Where should I go to make my search inquiries in the future. ?
> Where should I go to make my search inquiries in the future?
All of these options are listed in the banner at the top of this forum.
One way to get to the search of just the Help document is to search from any page of After Effects CS4 Help on the Web and make sure that the This Help System Only checkbox is checked.
If you don't check that box, then you also get pages from other websites (but they're websites that we've chosen for their relevance to your use of Adobe software). This is the same search that you can do from the upper-left corner of the After Effects application window or the default search from this page.