linux install ffmpeg

sudo apt-add-repository ppa:mc3man/trusty-media
sudo apt-get update
sudo apt-get install ffmpeg gstreamer0.10-ffmpeg

sudo apt-get install ppa-purge
sudo ppa-purge ppa:mc3man/trusty-media  # ignore warning if not found
sudo add-apt-repository ppa:mc3man/trusty-media
sudo apt-get update
sudo apt-get dist-upgrade

sudo apt-get install ffmpeg

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