For creators with a finished AI video

Fix AI video lip sync. Keep the usable take.

Fix AI video lip sync when the shot is usable but the mouth says different words. Add the intended recording and test one short passage.

Published November 3, 2026

Try my video and final audio Is this right for my clip?

You confirm the selected passage and credit quote before generation.

Fix AI video lip sync with your final audio

Your MP4 + your recording → one lip-synced passage

1 Choose AI clip
2 Add final voice
3 Review repair

Keep the usable AI shot. Supply the exact voice track the mouth should follow.

1 · VIDEO

2 · AUDIO

No files ready? Try an example

3 · Repair test length Adjust after adding your files

AI video start (seconds)Final voice start (seconds)Repair test length (seconds)

Start with one sentence. If only the sound is late, adjust it in your editor first.

5 seconds60 seconds max

Final selection: 8s, aligned to 25 fps (40 ms). Replacement audio replaces the original soundtrack. No looping or padded frames.

Your files stay private. Download links expire. Input guide

From the actual generated video

Compare the mouth, not just the soundtrack.

Play the result, listen to its recording and compare the same moment.

A real lip-sync pass · English · 10 seconds

Real MuseTalk output

Supplied recording Listen to the voice that guides the lips.

Watch for: Compare speech starts, closed-mouth sounds and pauses.

Stock footage paired with a separate English recording in a real MuseTalk run. This demonstrates mouth-changing, not a repair test of a broken AI video.

Loads the inputs. Generation requires your confirmation.

Run conditions & source credits

960 × 540 · 25 fps · continuous video excerpt 0–10s · natural English replacement audio, first 10s · no looped input · free-entitlement run; small delivered corner watermark

Footage: Antoni Shkraba on Pexels, video 8048249 (https://www.pexels.com/video/woman-talking-in-front-of-camera-8048249/), Pexels License (https://www.pexels.com/license/); continuous 0–10s excerpt, resized to 960 × 540 at 25 fps. Audio: LibriSpeech dev-clean, prepared by Vassil Panayotov with Daniel Povey; Panayotov, Chen, Povey and Khudanpur (ICASSP 2015), via OpenSLR SLR12 (https://www.openslr.org/12), CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), derived from LibriVox; recording 2277-149896-0032, first 10s, converted to mono 16kHz PCM WAV. Altered-media lip-sync demonstration using separate video and narration; no subject, speaker, creator or dataset endorsement. Provider endpoint: fal-ai/musetalk; exact upstream model revision undisclosed.

Same moment. Two frames.

Look closer at 4 seconds.

Original source at 4 seconds: front-facing speaker with a separate English recording — Original footage

Actual MuseTalk output at 4 seconds: front-facing speaker with a separate English recording — Generated mouth movement

Compare identical timestamps. Play the video to judge mouth movement; stills alone do not establish lip-sync quality.

Before you keep the result

What to check when you fix AI video lip sync.

Speech timing

Listen at normal speed. Check speech starts, stops and silence across the whole sentence.

Face detail

Inspect teeth, lip edges and the jaw during movement. Existing distortions may remain or introduce artifacts.

Need help with a delivered job? Use result troubleshooting or contact support with its job reference.

The right starting point

First, identify what is actually wrong.

Before you fix AI video lip sync, distinguish late sound, wrong mouth movement and damaged source footage.

Editorial collage of a finished talking-head clip, a mouth close-up and a separate audio waveform. — **Keep the take. Check the mouth against your final recording.**AI-generated scene illustration

01 / Timing problem

Everything is early or late.

If the mouth forms the right words but the soundtrack starts early or late, adjust the audio position in your editor first.

Adjust timing first

02 / Mouth movement problem

The mouth forms different words.

The final recording is correct, but the visible speech belongs to another line. Try the cleanest short passage.

Try a short lip-sync pass

03 / Source quality problem

The face is hidden or already distorted.

Choose another passage if the mouth is covered, tiny or distorted. Lip sync does not restore a damaged face.

Choose a better source

A concrete clip plan

Start with the sentence that matters.

Fix AI video lip sync on one clear sentence first. This eight-second selection is illustrative, not the settings of the real example.

Illustrative selection · not a generated test

Video passage12–20 s

An uninterrupted shot with one clear face.

Final recording2–10 s

The exact eight seconds the person should speak.

Shared clip length8 s

Both sources must contain the whole selection.

No looping or padding. Read the clip selection guide.

From your files to a reviewed clip

How to fix AI video lip sync.

Use the generator above with your own files. For every control and input limit, use the complete online guide.

01
Keep the final voice track.
Prepare the intended speech as WAV or MP3. Export it separately if it is inside your current video.
Details & checks
To fix AI video lip sync, supply the exact intended recording. This workflow takes two files; it does not extract, generate or clean up the voice. Use your editor to export audio from a video.
02
Choose a clean passage.
Select one visible speaker and matching audio. Set both start points and a shared clip length.
Details & checks
Select your MP4 and recording in the studio. Set the video start, audio start and shared clip length. Preview the inputs to check the passage and voice. That preview only plays your sources; the new mouth movement appears after a generation.
03
Review before generating.
Confirm permission, then inspect the selected duration, watermark and credit quote before generating.
Details & checks
Confirm permission to use the footage, voice and likeness, then sign in to upload. Review the selected duration, watermark and credit quote before confirming. Start with a short clip. The service does not stretch a short recording or repeat footage to fill the selection.
04
Inspect the complete result.
Watch the whole result with sound, including pauses and head movement.
Details & checks
After you fix AI video lip sync, compare the delivered MP4 with the source. Check the first words, pauses and ending. Keep it only when movement and timing fit your scene; another attempt is a new job.

A few useful answers

Before you fix AI video lip sync.

See current offers on pricing. Generation starts after your confirmation.

Can I fix AI video lip sync from any video model?

You can try to fix AI video lip sync from an MP4 with one suitable speaker and separate final audio. File compatibility does not guarantee quality; the example is not a test of every AI video model.

Will this fix a video whose audio is simply delayed?

Try adjusting the audio position in your editor first. A lip-sync pass changes mouth movement and is a different operation from shifting an audio track.

Can I repair the video without a separate audio file?

To fix AI video lip sync, prepare the speech as WAV or MP3. If it is inside the video, export it in your editor first. This tool does not extract the recording.

How long can the repair clip be?

A credit-funded job supports a selected 5–60 second passage. The final length is aligned to complete frames and shown in your quote. Check the current account balance and pricing before confirming.

Another job to do?

Scenario 02

Replace dialogue in video. One line at a time.

Scenario 03

Lip sync a dubbed video. Let the voice lead.

Start with one clear speaker

Ready to fix AI video lip sync?

Try my video and final audio

Need to see more first? Watch all real examples.