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iMovie Audio Out of Sync After Export

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Workaround available macOS Updated November 14, 2026Based on 3 user reportsHow we research

Quick answer

Audio can drift in exported iMovie files, often with slow-motion clips. Set custom speeds to standard values or test a short export.

Most likely fix: Standardise speeds

How to fix it

Try these in order — the most common fix is first.

  1. 1. Standardise speeds

    1. Select slow-motion clips
    2. Set speed to a standard value such as 25% or 50%
    3. Export again
    Did this fix it?

  2. 2. Detach and re-add audio

    1. Export the video
    2. Re-import it, mute its audio
    3. Add the original audio back
    Did this fix it?

Symptoms

Sound matches in the editor but drifts in the exported file.

Why it happens

  • Custom slow-motion clips
  • Long projects
  • Variable frame rate sources

This guide also covers

  • imovie audio out of sync
  • imovie sound sync

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