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this is more of a fact finding mission than solving a problem
was just curios,i was trying to install vlc media player (as the default media player wasnt playing some video tutorials i have and was battling installing on centos7 after googling a bit i found threads that were saying you needed to add two repos then run:
yum install vlc
i added the repos with yum -y install epel-release
then tried to run the yum install vlc...found nothing...i updated yum and tried again...nothing
running the command again though the terminal was telling me that EL 7 was installed
i then downloaded and installed the rpm from here:
There are two different repos at play here, don't confuse them.
First you installed epel, epel on CentOS 7 does not contain vlc, so when you then tried to install vlc, it failed
Then you installed nux-desktop, nux-desktop on CentOS 7 does contain vlc, so when you then tried to install vlc, it worked
The difference was simply which repo you added, not the way that you added it.
You just happened to enable the epel repo with yum, and enabled the nux-desktop repo with rpm. You could have easily enabled either of them by editing the yum repo files by hand instead, the results would have been the same. You simply needed to add the repo that contained vlc, and epel wasn't it.
Also, you should seriously consider installing and configuring yum-plugin-priorities to prevent yum from pulling in newer/incompatible libraries from these 3rd party sources and breaking half your system.