With a clean source video, Dubly.AI's Lip-Sync produces natural results out of the box. Almost every artifact you'll see traces back to a few specific extreme conditions in the footage — a mostly covered mouth, very steep camera angles, or a face that's too small in the frame. Here's how to spot them and what you can do.
When Lip-Sync works well
For most source videos, Lip-Sync looks natural without any extra setup. You'll get the best output when:
The speaker's mouth is clearly visible throughout
The face fills 10–40% of the frame
Lighting on the face is stable and even (no hard shadows on the mouth)
The footage is high resolution at a consistent frame rate (25 or 30 fps)
Sufficient high-quality footage is available for at least 10s
If your video meets these conditions and you still see artifacts, skip to the last section to contact support.
What to do about it
If only specific segments are affected: Re-cut your source to remove or shorten the problem shots. The Lip-Sync result from a cleaner version of the same content will be noticeably better.
If your source footage can't be improved: Disable Lip-Sync for that video. For content where the speaker is off-camera most of the time, or where the mouth is rarely visible, the dubbed audio over the original lips often looks more natural than a forced Lip-Sync.
If you're planning a new shoot: Most issues can be avoided at the source.
Still seeing artifacts?
If your source video meets the quality bar above — clear mouth, good framing, stable lighting, consistent frame rate — and you're still getting artifacts, ask Dubby in the chat (bottom right) and include:
The dub link
A timestamp of the problem segment
A short description of the artifact (out of sync, smudged lips, frozen face, etc.)
This helps us investigate whether it's something we need to tune on our side.
Related articles
Lip-sync limitations and workarounds — the full list of conditions where Lip-Sync struggles.