1. `yum install -y epel-release rpm`

> `rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7`

如果出现缺少Code提示，就执行此条命令

2. `yum repolist`

3. `rpm --import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro`

4. `rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-1.el7.nux.noarch.rpm`

5. `yum repolist`

6. `yum install -y ffmpeg`

7. `ffmpeg -version`