先安装yasm编译器。安装方法如下：
在http://www.tortall.net/projects/yasm/releases下面找到适合自己平台的yasm版本。然后进行安装。举例如下：
wget http://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz
tar zxvf yasm-1.3.0.tar.gz
cd yasm-1.3.0
./configure
make
make install





wget http://www.ffmpeg.org/releases/ffmpeg-3.1.tar.gz

tar -zxvf ffmpeg-3.1.tar.gz

cd ffmpeg-3.1

./configure
make
make install

1：先安装epel-release

yum install epel-release

2：安装nux存储库

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

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

3：现在就安装ffmpeg

yum install ffmpeg ffmpeg-devel

//等走完，国外服务器很快

4：上面走完之后测试下

ffmpeg -version