Install ffmpeg

add-apt-repository ppa:mc3man/trusty-media
Also note that with apt-get a sudo apt-get dist-upgrade is needed for initial setup & with some package upgrades
More info: https://launchpad.net/~mc3man/+archive/ubuntu/trusty-media
Press [ENTER] to continue or ctrl-c to cancel adding it
sudo apt-get update
sudo apt-get dist-upgrade
apt-get install ffmpeg

http://www.faqforge.com/linux/how-to-install-ffmpeg-on-ubuntu-14-04/