http://bit.ly/2vMdPqK MakeMkv free download page.
FFMPEG is the best, highest quality way to convert videos on Linux. Convert any video file format, including quicktime .mov, flash .flv files, open source .ogv, .mp4, .wmv, .asf and more. However, most of the time, it requires a command line. This can be avoided by installing a GUI graphical user interface for FFMPEG. http://winff.org/html_new/
