此文章所做的操作参考漏网的鱼：参考链接

步骤1：安装RPMfusion Yum存储库

RHEL或兼容发行版（如CentOS）上启用EPEL。

dnf -y install https://download.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
dnf localinstall --nogpgcheck https://download1.rpmfusion.org/free/el/rpmfusion-free-release-8.noarch.rpm
dnf install --nogpgcheck https://download1.rpmfusion.org/nonfree/el/rpmfusion-nonfree-release-8.noarch.rpm

步骤2：安装FFmpeg

dnf install http://rpmfind.net/linux/epel/7/x86_64/Packages/s/SDL2-2.0.10-1.el7.x86_64.rpm
dnf install -y ffmpeg

注意：安装过程中会安装很多依赖，而且***特别的慢，特别有一个包慢就算了还下着下着就失败了。安装特别慢的一个包我会附上离线包，离线包下载地址

离线安装rpm包命令:rpm -ivh cuda-npp-10.2.89-2.el8.x86_64.rpm

开发库安装

dnf -y install ffmpeg-devel

步骤3：检查

[root@xuzhiguo ~]# rpm -qi ffmpeg
Name        : ffmpeg
Epoch       : 1
Version     : 4.2.2
Release     : 5.el8
Architecture: x86_64
Install Date: Sun 26 Apr 2020 03:59:45 PM CST
Group       : Unspecified
Size        : 2191356
License     : LGPLv3+
Signature   : DSA/SHA1, Sat 28 Mar 2020 05:07:19 AM CST, Key ID 14386362f90c0e97
Source RPM  : ffmpeg-4.2.2-5.el8.src.rpm
Build Date  : Sat 28 Mar 2020 03:31:14 AM CST
Build Host  : localhost.localdomain
Relocations : (not relocatable)
URL         : http://ffmpeg.org/
Summary     : A complete solution to record, convert and stream audio and video
Description :
FFmpeg is a complete and free Internet live audio and video
broadcasting solution for Linux/Unix. It also includes a digital
VCR. It can encode in real time in many formats including MPEG1 audio
and video, MPEG4, h263, ac3, asf, avi, real, mjpeg, and flash.

因在实操中使用了大多教程，大同小异。最大的坑则是***较慢，其他的都是小问题，如遇到一些小问题还是问一下度娘我就不再次搬运了，写此文档也是记录一下自己的实操。