Britannica
Sources used in this answer
How are dialogue and lip movements synchronized in animated films?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
Animation
Scene from the 2024 science fiction animated film The Wild Robot, directed by Chris Sanders.
In animated filmmaking, the synchronization of dialogue and lip movements is a precise process that treats movement like a musical score. Because animation relies on the careful timing of successive drawings, the synchronization of speech is typically managed in one of two ways:1
- Prerecorded Sound: When dialogue and music are recorded before the animation begins, the animators are provided with an exact time scheme. They use this to ensure that the characters' lip movements align perfectly with the prerecorded words.1
- Post-recording: If the sound tracks are not recorded in advance, the timing of the action is predetermined on paper. This "scoring" of the action dictates the timing of the speech and music during the later recording stage.1
To maintain this precision, directors use a workbook that grades the progression of drawings frame by frame, ensuring that the visual movement matches the audio track with the same accuracy as notes in a musical score. This technique, known as lip synchronization, ensures that the character's mouth movements appear to utter the words being heard.12