You cannot directly drag and drop MKV files into iMovie for editing. To do that, you need to convert/transcode MKV to iMovie compatible video formats first. Here is the simple how-to.
As a popular video editing software for Mac system, iMovie easy to use for professionals as well as new users. You know that you can make your movies differently by editing them on iMovie. However, iMovie supports most commonly-used video codecs, including DV, MPEG-2, MPEG-4, H.264, AVCHD and AIC. Therefore, importing MKV to iMovie is not straight-forward. If you want to use MKV files in iMovie, you may have to transcode MKV to an iMovie-friendly format like MOV.
Most solutions online require Quicktime Pro or Perian, or has severe restrictions regarding the encoding types allowed within the .mkv container format. Here I highly recommend one professional yet easy-to-use video converter entitled EaseFab Video Converter for Mac. It lets you convert MKV files to iMovie in a few clicks! An iMovie preset is included for easy access. See how below about encoding MKV to iMovie format.
How to Convert MKV Files to iMovie Supported Format on Mac
Step 1. Add MKV files
After the program installed, you will come to an impressive interface. Now add your MKV video files. Two options:
1. Drag and drop the MKV file to left item tray directly.
2. Click “Add Video” button to add MP4 files.
Step 2. Choose the optimized preset for iMovie
You can directly choose the preset for iMovie which has been supplied by the VOB to iMovie Mac Converter. The setting also works for iMovie ’08, iMovie ’09, iMovie ’11, and iMovie HD etc.
Step 3. Start MKV to iMovie conversion
Hit the “Convert” button and this Video Converter for Mac will convert your MKV rapidly. After the conversion, you can import the output files to iMovie (the latest iMovie’ 11 supported).
Step 4. Import converted file to iMovie
Launch iMovie, from the File menu, choose Import > Movies, navigate to the folder that output MKV videos are saved. Select the files and click “Import”.
Bingo! You did it! With this MKV format to iMovie Video Converter for Mac, you can now import any MKV on you want to iMovie to make your movies stylish.