centos 7 安装音频视频解码器
1、安装额外的软件源epel和nux-dextop
2、安装所需的文件
yum -y –enablerepo=nux-dextop install gstreamer-ffmpeg vlc gstreamer-plugins-ugly gstreamer-plugins-bad gstreamer-plugins-ugly ffmpeg libvdpau mpg123 mplayer mplayer-gui gstreamer-plugins-bad-nonfree gstreamer1-libav gstreamer1-plugins-bad-freeworld gstreamer1-plugins-ugly
ps：其中有些是系统安装时可能自带了的，安装过程会自动忽略；默认情况下nux-dextop是失效的，所以要加上–enablerepo
