Audio and video out of sync

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Level 1

24 points

Audio and video out of sync

I recently downloaded some videos onto my macbook pro from a camera. Upon viewing the footage on the camera, the media was perfect, but the then when editing in iMovie, I found that the audio and video were out of sync and the audio cut three quarters through the footage. I had deleted the footage off my camera so I could not redownload the footage. However, I filmed another shot, viewed it on the camera and noticed it was right, downloaded it onto my mac and it is out of sync. (The videos are also out of sync on Quicktime Player too). Is there anyway to fix this? I'm quite desperate, someone please help me

macOS Sierra (10.12.3), Late 2011

Posted on Jul 23, 2017 6:13 PM

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Answer 1

Hawkie412 Author

Level 1

24 points

Jul 23, 2017 11:25 PM in response to Rich839

Hey Rich,

I downloaded HandBrake for Mac and checked it out, I found that the files are mp4. I configured one of the files to ACC for a test and downloaded the new clip, but it is still the same when playing back. Here are 2 pictures of the new file.

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Answer 2

Rich839

Level 8

48,174 points

Jul 24, 2017 8:36 AM in response to Hawkie412

Audio sync problems can be pesky, for sure. All you can do is try a few things.

Try sharing out the audio clip and see if the sync issue persists in the shared movie.

Try putting the clip into a newly created project and see if the issue remains.

You can try detaching the audio in iMovie, so it is a separate clip, and see if you can manually adjust it to sync. Expand out your timeline fully to make it easier to make fine adjustments.

You might also try adjusting the sample rate of the audio in Handbrake. 44.1 would make the audio slower, 48 would make it faster.

Another possibility is to stretch or shrink the detached audio clip using the free download, Audacity. You might want to take a look at this thread regarding use of Audacity:

Video and audio out of sync

Good luck with this.

-- Rich

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Answer 3

Rich839

Level 8

48,174 points

Jul 23, 2017 7:37 PM in response to Hawkie412

Hi,

Try converting a duplicate of your video to Mp4 (even if is already Mp4) using the free download, Handbrake. Sometimes that clears out glitches. It will ensure that the audio codec is AAC (Advanced Audio Codec) that iMovie likes.

-- Rich

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