Ffmpeg

http://www.tecmint.com/ffmpeg-commands-for-video-audio-and-image-conversion-in-linux/

https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu

links
Gist code
 * http://libav.org/ ffmpeg fork http://blog.pkh.me/p/13-the-ffmpeg-libav-situation.html