Models
Model Deprecation Notice: The lipsync-1.7.1 and lipsync-1.8.0 models will be deprecated on June 14th, 2025. We strongly recommend migrating to lipsync-1.9.0-beta or lipsync-2 for continued service. After the deprecation date, requests using these models will fail.
At sync, we’re building foundational models to understand and manipulate humans in video. Our suite of lipsyncing models allows you to edit the lip movements of any speaker in any video to match a target audio. Explore and compare the capabilities of the different models below.
All models are available in both Studio and API.
FAQs
Why isn't my AI-generated character's lip movement working properly?
The character in the input video needs to look like they are talking. Our models learn to mimic the speaking style in the input video. If the character is completely static, the model might not generate lips that move either.
Solution: When creating your AI-generated video, add the text prompt “person is speaking naturally” to your generation. This will create characters with lips that are already moving, which will work much better with our platform.
Can I use sync to lipsync a song to a character?
Absolutely, our latest model is your best bet for this. For best results, be sure to isolate and upload the vocals track, as the instrumental sounds can sometimes interfere with the lipsync quality.
Does sync work with animal faces or non-human characters?
You can lipsync human-like faces, but our models don’t currently support animals or non-humanoid characters.
Why is the lipsync quality poor or non-existent in certain parts of my video?
Please check if the problematic segments have:
- Multiple speakers in the frame
- Faces that are too small or in profile view
- Segments where the speaker in the input video is not speaking
For multiple people, try masking or cropping out some faces using external tools. We’re working to resolve these issues in future model releases.
Why does my video have poor quality lipsync when faces are in profile view?
Extreme profile view faces can lead to sub-par results. Please try with our latest model (lipsync-2), which has improved pose robustness and is your best option for challenging angles.
Why does the generated face appear to be lower resolution than my input video?
Our latest model generates faces at 512×512 resolution, which is usually sufficient for most 1080p videos. If the face in your input video is quite large, you may notice some resolution differences. For the highest possible quality, lipsync-2 offers the best resolution handling among our models.