Originally Posted by yzpdsg
So my problem is that can we install mplayer just by typing 'yum install mplayer' instead of compiling from source?
Yes, if you install a repo that has it. You can get binary versions of mplayer via yum from RPM Fusion or ATrpms. MPlayer is not available in the Fedora repos, and it's always been that way. Even in Fedora 11. So if you installed it with yum in Fedora 11, then you also installed a third party repo and just forgot about doing that, or you didn't realize the connection between that and being able to install mplayer.
P.S.: I just looked at the rawhide repo at RPM Fusion and the Fedora 12 repo at ATrpms, and they both have mplayer.