i created a media share for emby according to the guide from @tekkb and i was able to connect to it via smb from my macbook. Inside the media folder I created the subfolders ../music and ../videos/movies and copied one movie file and one music album to my omv server. I think this should be ok.
I installed emby, created an user (named the same as the one in omv) and two libraries, one for movies and one for music. This also seems to work, as I can see the shared folder with both subfolders in emby.
Buuuut...I don't see any media...neither under Filme nor under Musik...!? It seems the library scan doesn't find anything.
Hope to get some help. Thanks a lot!