Lip sync is the move of lips silently in synchronization with a pre-recorded soundtrack. It is widely used in Stop-motion, documentaries, or any animation that requires characters to speak. There are different mouth shape for different vowels for example a smiley wide open mouth shape is for vowels A and I. Like the pictures show below.
The mouth shapes has to be made before the audio because the shape makes the sounds so never delay the animation otherwise it will not look natural. We had a little task to lip sync a character. I chose 'You're a wizard, Harry' line from Harry Potter and the philosophy stone. Instead of following the letters, saying the line out would capture the mouth shape in accuracy and so I use U and E for You're; A for A; U, E,D for wizard; A and E for harry. It feels complicated at first but soon I found it's fun to do because it could change the emotion or exaggerate the expression according to how you want your character to be.
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