Nikon D3400 MXF to iMovie transcoder
Can't import MXF files from your Nikon D3400 to iMovie any longer after upgraded to macOS High Sierra? You are not the only one. At the moment, High Sierra does not have native support for MXF files yet. Fortunately, this problem can be solved via transcoding Nikon D3400 MXF video to iMovie preferred Apple InterMediate Codec (AIC .mov) first.
"I recently updated my system on my MacBook Pro to High Sierra. However, I can no longer import Nikon D3400 MXF files to iMovie. Before the update, I'm running Sierra with iMovie 10.1.6 and I can import MXF files into iMovie. Anyone know why the update doesn't allow this? Thanks for any help."
From what we have read, High Sierra does not have support for MXF files yet. To be able to load Nikon D3400 MXF files into iMovie properly, you will need to convert them first. Here's a guide displaying how to encode Nikon D3400 MXF clips to iMovie's favorite AIC .mov format.
How to encode Nikon D3400 MXF files to AIC .mov for iMovie editing?
To transcode Nikon D3400 MXF video to AIC for iMovie editing, do as below: Download Video Converter for Mac Video Converter (It is available for Mac, simply download the proper version depending on your computer.)
Step 1: Click "Add File" to load Nikon D3400 MXF video files into this program. 
Step 2: Select output format for iMovie Click "Profile" to select "iMovie and Final Cut Express" > "Apple InterMediate Codec(AIC) (*.mov)" as output format. AIC .mov is iMovie's favorite editing codec, which iMovie will read and handle well.

Tips: If necessary, you can click "Settings" button to modify video and audio parameters like encoder, resolution, frame rate, bitrate, aspect ratio, sample rate, and audio channels. You can also "enable 3D Settings" to add 3D effect to your source media.

Step 3: Click "Convert" to start Nikon D3400 MXF video to iMovie conversion. As soon as the conversion is complete, click "Open Folder" to get the generated AIC .mov files for editing in iMovie with optimum performance. Hope it helps.

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