Seems that in a ARM architecture libmms 0.6 (also earlier versions), does not work:
mpd use libmms, with the same compile option and version of mpd and libmms, in i386 the stream "mms://stream.polskieradio.pl/program3" work, in ARM architecture the stream give a "mmsx_connect() failed" error. I have found that other have this problem: other have this problem:http://www.musicpd.org/mantis/view.php?id=2717 (libmms+arm)
With "mimms" thereis the same problem.
I attach 2 strace, the one with the error on arm, the other without on i386.