sudo add-apt-repository ppa:mc3man/trusty-media或者 sudo add-apt-repository ppa:kirillshkrogalev/ffmpe
sudo add-apt-repository ppa:mc3man/trusty-media或者
sudo add-apt-repository ppa:kirillshkrogalev/ffmpeg-nextsudo apt-get updatesudo apt-get install ffmpeg
if account error: add-apt-repository command not found,please type this:
sudo apt-get install software-properties-common