ffmpeg -i inputVideo.mkv -vcodec copy -acodec copy outputVideo.mp4
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Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.
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Try the instructions here http://www.digitaltrends.com/computing/how-to-convert-mkv-files-to-mp4-format/