The Rephrase-Fit Method
How to keep dubbed dialogue on-time without speeding up the audio.
Most AI dubbing pipelines fix timing the cheap way: generate the audio, then stretch or compress it to fit the clip length. The result is technically lip-synced and audibly wrong. Rephrase-Fit solves timing at the translation step, before a single frame of audio is generated.
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What's Inside
Timing-Constrained Draft Translation
Translate the line with the original clip duration and syllable count as a hard constraint from the start.
Semantic-Preserving Rephrasing
Where the literal translation doesn't fit, rephrase to preserve meaning and character voice within the duration budget.
Natural Pacing Pass
Tune delivery speed to the character's own established speaking rate from their Voice Bible profile.
Verification Against Lip Movement
Check the generated line against actual mouth-movement timing in the source video before human review.
Naive dub: translate literally, then time-stretch audio to fit — sounds sped up or slowed down, pitch can waver.
Rephrase-Fit: translate against a timing budget from the first draft — natural pacing at the character's normal speaking rate.
Rephrase-Fit runs after the Enrichment Agent's context pass and before automated QA checks — it's the method behind the pacing checks in Category B of the QA Engine Checklist.
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