I really don't know how this happened but mplayer to work
mplayer: error while loading shared libraries: libx264.so.148: cannot open shared object file: No such file or directory
[ruben@flatbush ~]$ locate libx264.so
/usr/lib/libx264.so
/usr/lib/libx264.so.152
pacman -U /home/ruben/Downloads/mplayer-37998-2-x86_64.pkg.tar.xz
uck mplayer from arch testing