dnf install mplayer
dnf install smplayer
提示仓库
里没有这个软件
fedora默认不提供一些有版权争议的软件，非开源的项目包，所以需要用rpm fusion源，来补充Linux的“软件库”
解决方案:
fedora 26
4.11.11-300.fc26.x86_64
一，添加RPM Fusion源
进入 https://rpmfusion.org/Configuration
点击下载RPM Fusion free for Fedora 26， RPM Fusion nonfree for Fedora 26
# cd /home/for/Downloads/
# yum localinstall rpmfusion-free-release-26.noarch.rpm
# yum localinstall rpmfusion-nonfree-release-26.noarch.rpm
二，安装mplayer, smplayer(如果下载失败，再次执行#dnf install bar)
# dnf install mplayer
#dnf install smplayer