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选择安装convert

yum -y install ImageMagick

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

参考：

• https://www.htcp.net/3643.html
• https://blog.slogra.com/post-708.html