4K videos are choppy in iMovie, how to fix?

If you’ve been experiencing 4K videos jerky issues in iMovie, you may wish to read this post. It explains a workaround to solve 4K footage stutter problem in iMovie.

4K footage plays back jerkily in iMovie, how can I fix it?
“Hey guys! So I did some 4k recording with my Sony FDR-AXP33 video camera yesterday and the video playback is very choppy in iMovie. It is difficult to use the scrubber to identify edit points in the timeline. I’m working with iMovie 10.0.8 on an iMac late 2012 with 10GB of memory and Yosemite 10.10.3. The frame rate is 25fps. How can I stop the image kept ‘jumping’? Any ideas? Thanks for any help.”

4k jerky in imovie for mac
Unlike HD footage, 4K footage is quite a beast and takes up a lot of storage memory. If your machine doesn’t have the capacity to process 4k video, you are recommended converting the 4k video to 1080p AIC .mov and it will work well in iMovie. Here’s how.

How to solve 4K videos stutter issues in iMovie?

With HD Converter for Mac you can resize you beautiful but huge 4K down to 1080p AIC .mov. You shouldn’t have any issues viewing and editing the newly resized 1080 AIC .mov files within Apple iMovie on most computers.
4k video to iMovie converter

Follow these steps:
Step 1: Open up HD Converter for Mac as a 4K Converter for iMovie. When its main interface comes up, click ‘Add File’ to load your source media.
4K videos jerky issues in iMovie

Step 2: Select output format for iMovie
To convert 4K video files for iMovie, from ‘Profile’ list, choose ‘Apple InterMediate Codec (AIC)(*.mov)’ as output format under ‘iMovie and Final Cut Express’ column. This codec is also suitable for use in the discontinued FCE.
4K videos jerky issues in iMovie
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.

Step 3: Custom video and audio settings (optional)
If necessary, you can click ‘Settings’ button and go to ‘Profiles Settings’ panel to modify video and audio settings like video encoder, resolution, video bit rate, frame rate, aspect ratio, audio encoder, sample rate, audio bit rate, and audio channels. 3D settings are also available.

Step 4: Begin 4K video files to AIC MOV Conversion on Mac
When ready, click ‘Convert’ to start format conversion. Once the conversion process is complete, you can click ‘Open Folder’ button to get the generated AIC MOV files for editing in iMovie with optimum performance.
If you don’t want to wait for the entire conversion process, you can tick off ‘Shut down computer when conversion completed’ and go away to do other things.

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