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Switcher Blog

How to Fix Audio Sync Issues with iPhone Video

by Nick Mattingly
March 14, 2016

When the audio and video get out of sync, it is often referred to as lip flap or a lip sync issue. This is a common problem when importing iOS video into video-editing software because mobile devices don’t record at a constant frame rate. As a result, when you try to edit mobile video footage in the timeline on a post-production program like Avid or Adobe Premiere, it may not handle these elements properly. The strange thing is that the video will often play OK when watching individual clips in QuickTime, VLC, or Window Media Player. But what good is your video if you can’t edit it, or when you do and it ends up looking like a kung fu movie? There is a solution!

By processing your the recorded video from your iPhone or iPad before editing, you can set a fixed frame rate and edit with ease. Follow the steps below to get started:

  1. First, download the FREE open source software program. Download HandBrake https://handbrake.fr/downloads.php  
  2. Select the video file that you would like to convert by clicking the "Source" Button. 01source.jpg
  3. Set the destination where you would like to save your file by clicking the"Browse" button. 02browse.jpg
  4. Assign the frame rate. We recommend 23.97 FPS (NTSC Video).03framerate.jpg
  5. Select the "Constant Framerate" radio button.04constantfps.jpg
  6. Click “Start” to begin processing your video. 05start.jpg

Once you have re-encoded your video with a constant frame rate, import the new file into your post-production software and start editing.

NOTE: Final Cut Pro X and iMovie typically process variable bitrate video shot with iPhones and iPads relatively well. If you experience lip sync issues when editing footage using one of these programs follow the steps above and re-import your video.

Switcher Studio turns your iPhones into a production studio, letting you sync up to 9 iOS devices for a multicamera livestream. Take it for a spin with a free, 14-day trial.

About the Author

Nick Mattingly

Nick is a livestreaming and social video expert and leads the Switcher Studio team as CEO and co-founder. Since 2014, he has led the company to partnerships with Facebook Live, LinkedIn, Microsoft Stream, and beyond and has garnered features in TechCrunch, USA Today, Inc. Magazine, and BBC. Nick is also a member of the highly competitive Endeavor Entrepreneur network.

All posts by Nick M. >

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