We have moved on from lip syncing and hand keyed animation and into motion capture. Motion capture is great for quickly getting realistic animation. The system we use here at DAVE School uses infrared cameras. I believe there are 12 in all and are positioned as pictured below.
Now the actor wears a suit with 53 super reflective spheres placed all over his body. The cameras looks for these and communicate with each other to figure out where in 3D space these spheres are located. There is a lot of math going on, its actually pretty impressive. They are all doing real-time trigonometry to solve for 53 unknowns.
Now no system is perfect and the flaw that this system has is occlusion (when the spheres can not be seen by any of the cameras). Using 53 markers makes occlusion less likely though.
So this information is recorded and processed into a file that we can edit. There are a lot of steps and filters to go through to make sure the end result is good, however that being said I could probably do all this in a matter of an hour and end up a 5 minute animation all smoothed out. We do of course have to go back and hand key the hands, facial expressions and such (unless you decide to capture the face and hands as well. This is done in big films sometimes ex; The Hobbit, Avatar)
Now your probably wondering wow this is cool, but how expensive is it.. well, each one of these cameras cost $18,000. Then you have to figure x12 is $216000 or at least thats what I'm told. So its not really a cheap setup. Even if you want to rent out a Mocap (Motion Capture) studio, it cost thousands of dollars a day. So we are very lucky to have this great studio to work with!
Here is an example we were given. This was pre-recorded and the exercise was to get rid of any noise. Ohh I forgot to tell you, these cameras sample/record 120 times per/second. So in 1 second that camera calculates and record the location of all 53 points 120 times. That's a lot of information to work with. So this is when apply filters that get rid of this noise, the same filters in fact that are used in music production actually.
This isn't from here at the school, I just did a simple search online, but this is what the actors with their suits look like.