#Nux Dextop库依赖于EPEL库，所有要先安装EPEL库
yum -y install epel-release
#安装Nux Dextop库
rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-5.el7.nux.noarch.rpm
检查Nux Dextop是否安装成功：
$ yum repolist
安装ffmpeg
yum -y install ffmpeg-libs
yum -y install ffmpeg
原文：http://www.cnblogs.com/liqing1009/p/7794229.html