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Using deepfakes for better lip-sync in animations?
(lemmy.dbzer0.com)
I've done a little work on this professionally, and while I can't discuss our solution, here are some links that I turned up doing research that might be what you're looking for.
https://www.robots.ox.ac.uk/~vgg/publications/2016/Chung16a/chung16a.pdf
https://arxiv.org/abs/2008.10010
I just googled for "AI lip syncing" and got two interesting results: Gooey.ai, and sync.ai. Sync.ai seems to be more developed, but I don't know how much it will cost.
Looks pretty interesting. https://www.emotech.ai/solutions/sync-ai
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