在CentOS上安装FFmpeg

1、在线安装

yum install epel-release
yum install https://download1.rpmfusion.org/free/el/rpmfusion-free-release-$(rpm -E %rhel).noarch.rpm

yum install ffmpeg ffmpeg-devel

ffmpeg -version

2、手动下载并安装预编译版本

github上的下载地址：

https://github.com/BtbN/FFmpeg-Builds/releases/download/latest/ffmpeg-master-latest-linux64-gpl-shared.tar.xz

tar -xvf ffmpeg-master-latest-linux64-gpl-shared.tar.xz
mv ffmpeg-master-latest-linux64-gpl-shared /usr/local/ffmpeg

vim /etc/profile.d/ffmpeg.sh

#!/bin/bash

export FFMPEG_HOME=/usr/local/ffmpeg
export LD_LIBRARY_PATH=${FFMPEG_HOME}/lib  
export PATH=${FFMPEG_HOME}/bin:$PATH

source /etc/profile.d/ffmpeg.sh

ffmpeg -version

运行下面的环境变量查看命令：
	
env | grep PATH

发现控制台回显的PATH串包含/usr/local/ffmpeg/bin，
同时LD_LIBRARY_PATH串包含/usr/local/ffmpeg/lib，
说明FFmpeg的bin目录和lib目录都加载进了环境变量。