安裝方法：
https://www.videolan.org/vlc/download-redhat.html
yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum install https://download1.rpmfusion.org/free/el/rpmfusion-free-release-7.noarch.rpm
yum install vlc
root 無法運行， 需要修改配置, 修改方法：
cp /usr/bin/vlc /usr/bin/vlc.bak
vim /usr/bin/vlc 打開文件，把 geteuid 修改為 getppid