FFmpeg 是一个非常热门的开源项目，用来编解码音频视频流，被广泛用于各种流服务中。本教程在 CentOS 6、7、8 上面都可以使用，用来安装 FFmpeg 软件。

一、安装前需求一个 sudo 账户，一般都是默认 root 账户即可。

1、CentOS 8

安装所需依赖：$ sudo yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

$ sudo yum install https://download1.rpmfusion.org/free/el/rpmfusion-free-release-8.noarch.rpm https://download1.rpmfusion.org/nonfree/el/rpmfusion-nonfree-release-8.noarch.rpm

$ sudo yum install http://rpmfind.net/linux/epel/7/x86_64/Packages/s/SDL2-2.0.10-1.el7.x86_64.rpm

安装 FFmpeg：# sudo yum install ffmpeg ffmpeg-devel

2、CentOS 7

安装 Nux Desktop：$ sudo rpm --import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro

$ sudo rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-5.el7.nux.noarch.rpm

安装 FFmpeg：$ sudo yum install ffmpeg ffmpeg-devel -y

3、CentOS 6

安装 Nux Desktop：$ sudo rpm --import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro

$ sudo rpm -Uvh http://li.nux.ro/download/nux/dextop/el6/x86_64/nux-dextop-release-0-2.el6.nux.noarch.rpm

安装 FFmpeg：$ sudo yum install ffmpeg ffmpeg-devel -y

三、测试安装是否成功

1、查看版本$ ffmpeg -version

2、测试样例(MP3 -> OGG)$ cd

$ wget https://archive.org/download/MLKDream/MLKDream_64kb.mp3

$ ffmpeg -i MLKDream_64kb.mp3 -c:a libvorbis -q:a 4 MLKDream_64kb.ogg

3、测试样例(MP4 -> OGG)$ cd

$ wget https://archive.org/30/items/I_Have_A_Dream_Speech_excerpt/I_Have_A_Dream_Speech_excerpt.mpeg4 -O MLKDream.mpeg4

$ ffmpeg -i MLKDream.mpeg4 -codec:v libtheora -qscale:v 3 -codec:a libvorbis -qscale:a 3 -f ogv MLKDream.ogv