centos7使用yum安装不了ffmpeg

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[root@localhost]# yum install ffmpeg

Loaded plugins: fastestmirror

Loading mirror speeds from cached hostfile

epel/x86_64/metalink                                                                                                              | 7.7 kB  ::

 * epel: mirrors.aliyun.com

base                                                                                                                              | 3.6 kB  ::

docker-ce-edge                                                                                                                    | 3.5 kB  ::

epel                                                                                                                              | 4.7 kB  ::

extras                                                                                                                            | 3.4 kB  ::

updates                                                                                                                           | 3.4 kB  ::

(/): epel/x86_64/updateinfo                                                                                                     | 1.0 MB  ::

(/): updates//x86_64/primary_db                                                                                                | 3.2 MB  ::

(/): epel/x86_64/primary_db                                                                                                     | 6.6 MB  ::

No package ffmpeg available.

Error: Nothing to do

CentOS 7 需额外安装扩展源：
wget https://download1.rpmfusion.org/free/el/rpmfusion-free-release-7.noarch.rpm 2
wget https://download1.rpmfusion.org/nonfree/el/rpmfusion-nonfree-release-7.noarch.rpm 1
rpm -ivh *.rpm
rpm --import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro 2
rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-1.el7.nux.noarch.rpm 2
yum -y install ffmpeg ffmpeg-devel