How do they make their character’s mouths move at just the right speed? Is there a lot of overshooting/undershooting and then having to go back and fix the frames? Or is there some general rule of thumb (x amount of frames to each second of audio)?
In: Technology
There are several different ways to do that like the other posters already mentioned.
A specific example would be the use of a software that helps you align phonemes (essentially descriptions of mouth shapes) onto a timeline.
For example the open source software Papagayo-NG (Disclaimer: slight self-promotion on my part) is one such software:
https://github.com/morevnaproject/papagayo-ng
You load your sound file and type in your text, then you let it break that down into it’s smaller building blocks and you can arrange those on a timeline.
The final result can then be exported to a lot of different formats which you can then use in your animation software.
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