From 4Videosoft Studio:
4Videosoft MKV Video Converter has the capability to help you convert MKV to MP4, Convert MKV to AVI, MOV, WMV, MOV, FLV, MTS, TS, MXF, MPEG and more on Mac. It's easy to extract the audio files from the source MKV files and then convert them to MP3, M4A, AAC, AIFF, FLAC, WAV, WMA with no quality loss. This almighty MKV converter for Mac is highly compatible with iPhone 6s/6s Plus/6/6 Plus, iPhone 5s/5c, iPhone 5, iPad mini, iPad Air, iPod nano, Samsung Galaxy S6/Note 5, Nokia Lumia, Kindle Fire, HTC One.
Besides, this powerful Mac MKV converter includes multiple creative video editing functions, which you can drag the slide bar of brightness, contrast, saturation, hue and volume for a better video effect. Trim function allows you to cut off undesired video part and Merge function helps you put several video files into a new single file. Meanwhile, you can get rid of the black edges as well as add text/image watermark to the video. These video editing functions ensure you to get a satisfying output video. You are able to customize the video and audio settings (video/audio encoder, frame rate, resolution, channels), choose your desired audio track and subtitle, define the output destination and so on.