环境
CentOS 6/7
安装
导入GPG key
rpm --import http://packages.atrpms.net/RPM-GPG-KEY.atrpms
安装ATRPMS Repo
rpm -ivh http://dl.atrpms.net/all/atrpms-repo-6-7.el6.x86_64.rpm
选择ATRPMS Repo安装ffmpeg
yum -y --enablerepo=atrpms install ffmpeg ffmpeg-devel
验证ffmpeg版本
ffmpeg -version
参考：http://www.scalescale.com/tips/nginx/ffmpeg-php-ffmpeg-centos-6-7/