1 rpm -Uvh http://dl.atrpms.net/el6-x86_64/atrpms/stable/atrpms-repo-6-7.el6.x86_64.rpm
2 yum install -y ffmpeg ffmpeg-devel
3 rpm -e atrpms-repo-6-7.el6.x86_64

1. sets up repo
2. installs from repo
3. removes repo