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Vozo automatically analyzes your video and applies lip sync to the detected speaking face, which is especially useful for multi-person scenes. After processing, you can edit speaker markings in the editor to specify which face should or shouldn’t be synced during specific time segments.

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Show Original Video & Mark Speaker

Toggle the Show Original & Mark Speaker switch at the bottom-left corner of the editor to view a side-by-side comparison:
  • Left: the original video
  • Right: the generated video
Lip Sync Editor Show Original Pn
In the original video preview, all detected faces will be labeled:
  • Marked Speaker — this face is identified as the current speaker and has been synced to the audio.
  • Not Speaker — this face is not identified as the speaker and remains in its original state without lip sync.

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How to Mark the Speaker

1

Correct Speaker Markings

  • If the speaking face was not correctly recognized as the speaker, click Mark as Speaker button.
  • If no one in the frame is actually speaking (for example, during a voiceover or narration), click Not Speaker on the incorrectly marked face.
2

Regenerate Edited Clips

Click Regenerate x Edited Clips to update all segments with modified markings.

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Mark Specific Time Segments

Vozo automatically splits your video into multiple timeline clips.
If the part you want to edit isn’t already separated, you can split it manually:
1

Move the Playhead

Drag the playhead to the time point you want to isolate.
2

Split the Clip

Click the Split button in the top-left corner of the timeline to create a new clip.Lipsyncsplit Pn
3

Edit the New Clip

Adjust the speaker marking for the new segment as needed.

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Common Scenarios and Solutions

When multiple faces appear in a scene, Vozo might apply lip sync to the wrong one.How to fix:
  1. In the original video preview, click the correct face and choose Mark as Speaker.  The incorrect face will automatically be unmarked.
  2. Click Regenerate x Edited Clips to update the result.
If the audio comes from an off-screen narrator or background voice, the system may still apply lip sync to a visible face.How to fix:
  1. Select the synced face and click Not Speaker.
  2. Click Regenerate x Edited Clips to remove lip sync and restore the original mouth motion.
Sometimes, lip sync can make the mouth appear over objects like microphones or hands.How to fix:
  1. Click Split to isolate that segment on the timeline.
  2. Select the segment and click Not Speaker.
  3. Click Regenerate x Edited Clips to remove lip sync.
This fix is best for short, temporary obstructions.
If the face is frequently covered, it may not be suitable for lip syncing.
Lip sync may generate unwanted mouth movement when the speaker is silent.How to fix:
  1. Click Split to isolate the part where the issue occurs.
  2. Click Not Speaker for the face in that segment.
  3. Click Regenerate x Edited Clips to apply the update.
During fade-in or fade-out transitions, lip sync may create distorted facial effects.How to fix:
  1. Click Split to separate the transition from the rest of the video.
  2. Click Not Speaker for the face in that segment.
  3. Click Regenerate x Edited Clips to finalize.
Removing sync during transitions helps maintain a more natural look between scenes.