How can can I convert video in LINUX

Download and use the command-line tool ffmpeg. It can transcode just about any video format into any other. I use it frequently (up to several times a week). It is the best audio/video transcoder that I have found, including ones on Windows and Mac. Go to www.ffmpeg.org for details or to download/install.

http://www.videohelp.com/tools/MKVtoolnix
this is good one too(GUI)
Never used ffmpeg, but mkvtoolnix is really fast

EDIT: actually, i only used to convert to mkv, i dont know about other kinds

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.