If audio is out of sync with video, first check whether the delay stays the same or grows over time. A fixed offset and progressive drift need different corrections. Find where the problem enters the workflow before moving every clip or changing a recording’s duration.

Check the source, editing timeline, export and uploaded version separately. Otherwise, you may correct a file that was already right while leaving the actual problem untouched.

Vimeo’s troubleshooting guidance identifies source-file sync, decoding, variable frame rate and conversion among possible issues. Those are investigation paths, not proof of the cause in your project.

Find the earliest faulty version

Open the original source outside the editor. Choose a visible event with a clear sound, such as a hand clap or an object making contact.

Then check the same event in the timeline, the exported file and the published version.

Write down the first place where the relationship changes. If the source is correct but the export is wrong, moving the source on the timeline may create a second problem.

Use the same event for every comparison. Switching between unrelated moments makes it harder to tell whether the fault changed.

Keep original files intact while testing.

Separate offset from drift

Check a clear event near the beginning, another in the middle and another near the end.

If the sound is late by a similar amount throughout, investigate a fixed offset. If the difference increases, investigate drift or a duration problem.

A sudden jump after one edit may point to a local timeline change rather than a recording-wide fault.

These observations narrow the task. They do not identify the cause by themselves.

Make a simple log with the event, approximate position and whether the sound is early or late. Consistent notes are more useful than repeatedly saying the whole video feels wrong.

Rule out a playback problem

Try the exported file in another suitable player and listen through a wired playback path if available.

If the file appears correct in one arrangement and wrong in another, investigate the playback chain before altering the edit.

Also distinguish what you hear while editing from what the file contains. A monitoring delay can be distracting without changing the recorded timing.

Do not compensate for a particular headphone or speaker path by permanently shifting the programme’s audio.

Keep the test conditions clear so someone else can reproduce your observation.

Correct a fixed offset on a copy

If a consistent offset is established, make a working copy of the sequence and adjust the relevant audio against a clear reference event.

Check more than one event afterwards. A shift that fixes the opening should also improve the middle and end if the issue was genuinely constant.

Move related material together where needed. Shifting a microphone without considering connected ambience or another recording can create a different mismatch.

Keep a note of the change and its reason.

Avoid guessing from a single mouth movement when a more definite reference is available. Some spoken sounds are harder to judge visually than a clear contact.

Investigate a changing duration

If the difference grows, do not assume a simple shift will solve it.

Check whether a source was converted, reinterpreted or altered before import. Compare the duration with the original and inspect the project’s media information.

If separate devices recorded the scene, preserve the original recordings and check alignment at several points. Do not stretch the entire programme merely because one recorder behaves differently.

Where a duration correction is justified, test a short section and review the performance. Extensive changes may affect the sound in ways that require further assessment.

Use the current documentation for your editor’s timing tools.

Check variable frame rate handling

Some recordings need additional care because of how their video timing is stored.

Vimeo recommends constant frame rate for its workflow and notes that variable frame rate can occur in screencasts and webinars. Follow your destination and editor’s current guidance when evaluating those files.

Do not treat every screen recording as faulty, or assume that converting it guarantees a fix.

If you create a test conversion, compare its picture timing, audio relationship and duration with the original before replacing media in a large project.

Retain both versions until the result is verified.

Work through a simple diagnosis

Imagine a twenty-minute interview.

The original file appears correct in a player. The editing timeline also looks correct. The export begins correctly but is noticeably wrong near the end.

That pattern suggests you should investigate export and media handling before shifting the entire timeline.

Now imagine a different file whose audio is equally late at the opening, middle and end, including in the original. A fixed source offset becomes a more plausible working diagnosis.

The examples show why the same instruction cannot solve every sync complaint.

Record what you actually observe rather than choosing a cause from the first search result.

Test the delivered version

After a correction, export a short representative section and a longer test where duration matters.

Check the beginning, middle and end again. Then review the uploaded or delivered version, because a local export test does not establish how another platform handles the file.

If the source remains wrong, correct it before uploading again rather than hoping the destination will repair it.

Keep a verified reference export with the project notes.

Finish the soundtrack after timing is stable

Do not build a detailed effects sequence around media whose sync remains uncertain.

Once the dialogue and picture relationship works, restore music and effects and check their timing too. A previous manual adjustment may now be redundant.

If you need supporting audio, browse RouteNote Licensing music and check the applicable current licence. Finish with a complete playback check rather than judging only the repaired moment.