> For the complete documentation index, see [llms.txt](https://docs.convai.com/api-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.convai.com/api-docs/plugins-and-integrations/convai-unreal-engine-plugin/features/lip-sync.md).

# Lip sync

Lip sync makes a character's mouth and face move in time with its voice. When the character speaks, Convai sends face animation data alongside the audio so the two stay in sync — with no extra processing cost in Unreal Engine.

<table data-view="cards"><thead><tr><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>How lip sync works</strong><br>Understand how Convai delivers face animation data alongside audio and how to choose the right mode for your character rig.</td><td><a href="/pages/lOSnElQlgFyVpLhYq4IH">/pages/lOSnElQlgFyVpLhYq4IH</a></td></tr><tr><td><strong>Lip sync quick start</strong><br>Add Face Sync to a MetaHuman character and hear lip-synced speech in Play In Editor.</td><td><a href="/pages/rHjIjF6OivZ5wW5NeV4L">/pages/rHjIjF6OivZ5wW5NeV4L</a></td></tr><tr><td><strong>Face Sync component reference</strong><br>All properties of the Convai Face Sync component and every lip-sync mode value.</td><td><a href="/pages/lsZCsc7Ypsg79ozXB0fr">/pages/lsZCsc7Ypsg79ozXB0fr</a></td></tr><tr><td><strong>Face Sync AnimGraph node reference</strong><br>Every property of the Convai Face Sync AnimGraph node: apply mode, alphas, smoothing, starvation, and mapping.</td><td><a href="/pages/ShOSJ5HqZshB5R4ioXln">/pages/ShOSJ5HqZshB5R4ioXln</a></td></tr><tr><td><strong>Record and replay lip sync</strong><br>Capture a live lip-sync sequence during a conversation and replay it later with the C++ recording API.</td><td><a href="/pages/ZuNnaqm1ldGai22u0MPD">/pages/ZuNnaqm1ldGai22u0MPD</a></td></tr><tr><td><strong>Lip sync usage examples</strong><br>Common setups including Add vs Override blending, smoothing tuning, and custom blendshape remapping.</td><td><a href="/pages/n5M1eapXfiR0tOlawpbm">/pages/n5M1eapXfiR0tOlawpbm</a></td></tr><tr><td><strong>Troubleshoot lip sync</strong><br>Fix no mouth movement, frame starvation, wrong blendshape map, and rig mismatch.</td><td><a href="/pages/OrGmrNEAMlVbk4NSYCL3">/pages/OrGmrNEAMlVbk4NSYCL3</a></td></tr></tbody></table>

### Next steps

Start with [How lip sync works](/api-docs/plugins-and-integrations/convai-unreal-engine-plugin/features/lip-sync/how-lip-sync-works.md) to understand the data pipeline and the six lip-sync modes. Then follow [Lip sync quick start](/api-docs/plugins-and-integrations/convai-unreal-engine-plugin/features/lip-sync/lip-sync-quick-start.md) to get lip sync running on a MetaHuman character before moving into the reference pages.


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