VolcEngine Lip-sync tackles the problem every video team eventually hits: the footage is right but the words are wrong. Instead of reshooting, this video-to-video model takes an existing clip plus a replacement audio track and regenerates the speaker’s mouth movement to match the new speech. VolcEngine is ByteDance’s cloud-technology arm, and this tool reflects that production-scale focus.
The workflow on Flux 3 AI is upload, attach, generate: provide the source video, supply the audio it should now speak, and the model re-syncs the lips while the rest of the frame stays untouched. That makes it fundamentally different from generators — it is a surgical edit, not a new creation.
Processed clips come back at 720p or 1080p in 16:9 or 9:16 formats. The headline use case is localization: record a translated voice track, run the original video through Lip-sync, and ship a version that looks natively filmed in the new language. Corrections, censored words, and updated product names work the same way.
See what's possible on Flux 3 AI
Sample generations from the platform — write your own prompt to see what VolcEngine Lip-sync does with it.
VolcEngine Lip-sync vs similar AI video models
Specs from the live catalog — every model below is available on the same account.
| Spec | VolcEngine Lip-sync | InfiniteTalk | OmniHuman 1.5 |
|---|---|---|---|
| Max clip length | 8s | 8s | 8s |
| Durations | 4s, 6s, 8s | 4s, 6s, 8s | 4s, 6s, 8s |
| Resolutions | 720p · 1080p | 720p · 1080p | 720p · 1080p |
| Aspect ratios | 2 | 2 | 2 |
| Audio | |||
| Image to video | |||
| Reference images | up to 1 | up to 1 | up to 1 |
| Keyframes | |||
| Negative prompt |
Capabilities reflect what each model supports on Flux 3 AI today.
What makes VolcEngine Lip-sync stand out
Video-to-video sync
Starts from real footage rather than a photo — the existing performance stays, only the mouth is regenerated.
Dub without reshoots
Swap dialogue after the shoot wraps: new lines, fixed mistakes, or an entirely different language.
Localization-ready
Pair translated voiceover with re-synced lips to make one recording session serve every market.
Frame-preserving edits
Lighting, background, wardrobe, and camera work carry through unchanged — viewers see the same video, new words.
Popular use cases
Why creators run VolcEngine Lip-sync on Flux 3 AI
- Dub with VolcEngine, then finish with Topaz — every step billed from one shared pool.
- No standalone VolcEngine account needed; your Flux 3 AI login covers this and 41+ models.
- Localized versions stack beside the originals in your library, downloadable clean for every market.
VolcEngine Lip-sync specs & capabilities
Output
- Clip duration4, 6, 8 seconds
- Resolutions720p · 1080p
- Aspect ratios16:9 · 9:16
- Generation modesVideo to Video
Controls
- Image to video (start frame)
- Reference images
- First & last frame keyframes
- Audio generation
- Negative prompt
- Video input / editing
- Extend video
VolcEngine Lip-sync prompt examples
Copy one as a starting point, or send it straight to the Create studio.
“Re-sync this product demo so the presenter speaks the new Spanish narration naturally, keeping her original pacing, smiles, and hand gestures fully intact”
The flagship localization dub — one shoot, a second language
“Replace the outdated pricing line in this ad read — the spokesperson now says “plans start at nine dollars” — matched to his original delivery”
A surgical one-line dialogue correction without any reshoot
“Dub this customer testimonial with the fresh studio voiceover, mouth shapes tracking every consonant while the lighting, background, and framing stay untouched”
Tests frame preservation and consonant-level sync accuracy
Create with VolcEngine Lip-sync in three steps
Describe your idea
Write a prompt — the more specific the scene, motion, and style, the better VolcEngine Lip-sync performs.
Pick VolcEngine Lip-sync & settings
Choose duration, resolution, and aspect ratio. The studio shows the exact credit cost before you generate.
Generate & download
VolcEngine Lip-sync renders in the cloud — track progress in your library, then download watermark-free or share with a link.
VolcEngine Lip-sync questions, answered
What is VolcEngine Lip-sync?
It is a video-to-video model from VolcEngine, ByteDance’s cloud division, that replaces the lip movement in existing footage so it matches a new audio track. On Flux 3 AI you upload a video and an audio file and receive a re-synced clip.
How is this different from a talking-photo tool?
Talking-photo models like InfiniteTalk animate a still image from scratch. VolcEngine Lip-sync edits real video you already shot — it keeps every frame and only regenerates the mouth region to fit the replacement speech.
Can I translate a video into another language with it?
Yes — that is the flagship use. Record or synthesize the translated narration, run the original footage through VolcEngine Lip-sync on Flux 3 AI, and the speaker appears to deliver the new language naturally.
Do I need to reshoot anything?
No. The whole point is avoiding reshoots: dialogue changes, corrections, and updated terminology are handled by supplying new audio, while the visuals from the original production remain intact.
What output quality does VolcEngine Lip-sync deliver?
Re-synced videos are produced at 720p or 1080p in 16:9 or 9:16, and downloads from your Flux 3 AI library carry no watermark, so they drop straight back into your edit.
Is it legal to lip-sync someone else’s video?
Only modify footage you own or have permission to alter. Using the tool to make real people appear to say things they did not say violates Flux 3 AI’s terms — it is built for dubbing and correcting your own productions.