How can I install a 11.2 Milestone’s multimedia codecs?
I’ll never really understand these types of questions firstly this should be here Pre-Release/Beta - openSUSE Forums
Next if people are testing beta/alpha/pre-release they really should be able to do some minimal trouble shooting them selves, and certainly be able to search.
I’ve not tried but just use the gstreamer backend which supports a fair few out of the box. Next if you search the suggestion is to install 11.1 rpms nope don’t know how to do it but from the sounds of things it works fine.
You will certainly find the solution by searching in the forum referenced by FeatherMonkey. You should find explanatory posts as far back as milestone 1 and 2. 