MTS in iMovie 10.1.8-High Sierra won’t import AVCHD

iMovie won’t import AVCHD MTS clips correctly after updated to High Sierra? Actually, lots of users have run into the same issue. We write this post to help those who are experiencing incompatibility issues dealing with AVCHD MTS files in iMovie 10.1.8 on macOS High Sierra.

MTS files lost sound in iMovie on High Sierra, how to fix?
“I’ve worked with AVCHD MTS files in many projects currently in iMovie. After updated to iMovie 10.1.8 and High Sierra, iMovie suddenly does not recognize the audio on all those projects I’ve worked on and they became completely silent with no audio. I’m sure all these files had audio before the update. What’s going on??? They are just no sound!!! Did I miss something? Please help!!!”

Current iMovie 10.1.8 and High Sierra do not correctly handle the AVCHD MTS files like it used to do in the past. Try converting the MTS files to Apple InterMediate Codec using HD Video Converter for Mac would be a solution. You will get a .mov files that encoded with InterMediate Codec after the conversion, and the AIC .mov video will ensure a smooth workflow between your MTS files and iMovie on macOS High Sierra. No audio lost issues or other issues will happen again. Here’s how to do the conversion.

How to encode AVCHD MTS files for editing in iMovie on High Sierra without audio lost issue?

Download a free trial of HD Converter for Mac
mts to imovie converter for high sierra

Follow these steps:
1. Install and run HD Converter for Mac as a MTS Video to iMovie Converter on High Sierra. The main interface appears as below:
iMovie won’t import AVCHD MTS correctly on High Sierra

2. Click on ‘Add File’ to add your AVCHD MTS files to the program from your camcorder or from a card reader, or from an archived folder that contains your source media.

3. From the “Profile” menu, choose ‘Apple InterMediateCodec (AIC) (*.mov) as output format from ‘iMovie and Final Cut Express’ column.
iMovie won’t import AVCHD MTS correctly on High Sierra
Important: If you’ve loaded a number of video clips to do batch conversion, please do remember ticking off ‘Apply to All’ option before you start.

4. (Optional) Click ‘Settings’ button and go to ‘Profile Settings’ window to custom video and audio settings if necessary.

5. When ready, click ‘Convert’ to start transcoding mts files to AIC – the best suited editing format for use within Apple iMovie.

6. When the conversion process is complete, click ‘Open Folder’ button to get the generated AIC QuickTime files and open them in iMovie for further editing with optimal performance.

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