the "one click" ?? is questionable
there is currently an issue with one of the repos that might cause an error
pacman and oss and the version of "liborc"
updating the multimedia at this time is NOT recomended if using pacman repo
HOWEVER using the oss version of "liborc"
and blacklisting it from pacman ?? might allow the "one click " ??
install by hand -- see below
"Multi-media and Restricted Format Installation Guide-- UPDATED FOR 11.3"
you might also want to use this VERY highly recommended
"Check your multimedia problem in ten steps "