CentOS 6&7 安装 ffmpeg

CentOS 6和7 安装方法是不一样的，下面分别说明：

安装前都需要先安装epel扩展源
yum -y install epel-release

CentOS 6比较简单，安装yum源之后直接安装即可：

su -c 'yum localinstall --nogpgcheck https://download1.rpmfusion.org/free/el/rpmfusion-free-release-6.noarch.rpm https://download1.rpmfusion.org/nonfree/el/rpmfusion-nonfree-release-6.noarch.rpm'
yum -y install ffmpeg ffmpeg-devel

CentOS 7 需额外安装扩展源：

su -c 'yum localinstall --nogpgcheck https://download1.rpmfusion.org/free/el/rpmfusion-free-release-7.noarch.rpm https://download1.rpmfusion.org/nonfree/el/rpmfusion-nonfree-release-7.noarch.rpm'
rpm --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-0-1.el7.nux.noarch.rpm
yum -y install ffmpeg ffmpeg-devel

至此ffmpeg已安装完成，可测试一下：

#将amry格式转为mp3
ffmpeg -y -i origin.amr new.mp3

#PHP代码中执行
exec("ffmpeg -y -i origin.amr new.mp3");