第一步：

（https://li.nux.ro/repos.html）

Summary: A desktop and multimedia oriented RPM repository for EL. It contains a lot of graphical programs such as Ardour, but also text based apps line Cone.

Notes: This repository is made to coexist with Fedora EPEL; it will probably conflict badly with Repoforge/RPMforge and ATrpms and possibly other repos. I try hard not to overwrite Base.
Installation (copy/paste) for EL6: yum -y install epel-release && rpm -Uvh http://li.nux.ro/download/nux/dextop/el6/x86_64/nux-dextop-release-0-2.el6.nux.noarch.rpm

Installation (copy/paste) for EL7 （CENtOS 7）: yum -y install epel-release && rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-5.el7.nux.noarch.rpm

第二步：

据说nux库和其他库如rpmforge会有冲突，首先默认关闭nux库：

vi /etc/yum.repos.d/nux-dextop.repo

------

enabled=0

------

第三步：

sudo yum --enablerepo=nux-dextop install gstreamer1-libav gstreamer1-plugins-bad-free-extras gstreamer1-plugins-bad-freeworld gstreamer1-plugins-base-tools updates gstreamer1-plugins-good-extras gstreamer1-plugins-ugly gstreamer1-plugins-bad-free gstreamer1-plugins-good gstreamer1-plugins-base gstreamer1

第四步：

Enjoy！