iMovie is a video editing software application which allows Mac users to edit their own home movies. iMovie imports video footage to the Mac using either the FireWire interface on most MiniDV format digital video cameras, the USB port, or by importing the files from a hard drive. From there, the user can edit the video clips, add titles, and add music. Effects include basic color correction and video enhancement tools, and transitions such as fade-in, fade-out, and slides.
Before you can begin working in iMovie, you need to bring in some
imovie import mkv video from a video recording device and store the video on your computer (or an external hard disk). iMovie will also allow you to import the following file formats:
DV (standard definition) and HDV (high definition), MPEG-2 and AVCHD from Camcorders, MPEG-4, DV, and .MOV files stored in Mac.
MKV to iMovie Converter can
import MKV to iMovie supported format such as mp4 for edit.
How to import MKV video files to apple imovie on Mac OS X with iMovie Mac Video Converter?
Step 1: Add MKV video files
Free download, install and run MKV to iMovie Converter, then click "Add File(s)" button on the toolbar, select you want to convert MKV files in the dialog box that open.
Step 2: Select output format: "MPEG-4 Movie (*mp4)"
Step 3: Convert MKV file
Click "Convert Checked Item(s)" button on the toolbar to start converting the files.
Step 4: Importing convertion mp4 files to imovie
Launch iMovie, go to "file > import movies". Select the converted MP4 video then click "import".
iMovie import ASF, ASF to iMovie - How to import asf video files to imovie on Mac OS 
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