MKV

The Matroska Multimedia Container is an open standard, free container format, a file format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. It is a universal format for storing common multimedia content, like movies or TV shows. Matroska is similar in concept to other containers like AVI, MP4, or Advanced Systems Format (ASF), but is entirely open in specification, with implementations consisting mostly of open source software. Matroska file extensions are .MKV for video (which may or may not include subtitles and/or audio), .MK3D for stereoscopic video, .MKA for audio-only files, and .MKS for subtitles only.

- - Wikimedia

AVI

AVI is an acronym for Audio Video Interleave. The .avi file format is a container file format that was introduced by Microsoft in 1992. Container files are a "shell" file that can contain a variety of files within the container file. Container files with the .avi file extension often contain audio and video data. The data contained in the AVI files may be encoded in codecs, allowing the files to use less compression than other video file formats, such as the MPEG and MOV file formats. However, AVI files have a 2 GB size limit, restricting their use to some degree.

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Step-By-Step to Convert MKV to AVI for Mac

Interface

Step 1. Download and install the program, then double click it to run it, and then you'll see the main interface of the program.

Load Files

Step 2. Click "Add File(s)" button. Here you can select "Add Video" or "Add Folder" button to add files as you like.

Profile

Step 3. Click the drop-down arrow right beside the "Profile" column and select your desired video format from the drop-down list.

Edit

Step 4. Click "Edit" button to customize the output video like Effect, Trim, Crop, 3D Settings and Watermark.

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