Lip sync: a patch applied to a mouth that was already drawn
Lip sync adjusts mouth movement to match a replaced soundtrack. It is a repair applied after both the picture and the new audio exist, and it is a separate operation from generating the line in the language in the first place. As of 2026-09-22.
| Property | Dub plus lip sync | Generated in the language |
|---|---|---|
| Number of passes | Two or three | One |
| Mouth movement | Adjusted afterwards | Produced with the line |
| Constrained by the original timing | Yes | No |
| Published by any vendor here | Yes, by several | Yes, by one |
Inclusion rule. The two published mechanisms for a video in a language other than the original. Both appear among the vendors read here. Order. Fixed order, the multi-pass mechanism first.
1A repair is visible in the places it did not reach
Adjusting a mouth works on the mouth. Jaw movement, breath, head motion and the rest of the performance were made for the original line, and the mismatch between them is what an audience registers as dubbing.
That is a property of the sequence rather than of the quality of any one step. It is why the number of passes is worth recording alongside a language list rather than being treated as an implementation detail.
2One vendor here describes the single-pass arrangement
A vendor in this register states that the chosen language is performed as the shot is generated, with no separate dubbing step and no lip-sync patch afterwards. That is a claim about method, not about how convincing the result is.
It is recorded as the vendor own description. What it changes commercially is which vendor list a production is shopping from: a team planning a dubbing pass is budgeting differently from one that is not.
3Neither mechanism is visible in a count
A figure of a hundred and something languages says nothing about how many passes produced them. Two vendors with the same figure can be selling a conversion service and a generation tool.
So the register prints the mechanism where a vendor describes it and leaves it blank where nobody does. Several cells here hold a number and no mechanism at all.
A definition, not a measurement: no vendor figure appears here that is not also in the register. The one published single-pass description is recorded on that vendor cell.
Nearby terms: Dubbing, In-shot audio. The whole vocabulary is at terms; nothing on this page is a claim about a named product.