It seems bug 289463 has resurfaced. Again, there's no problem during playback, but as the app closes (not mplayer, a different app), a warning is printed: Inconsistency detected by ld.so: dl-close.c: 736: _dl_close: Assertion `map->l_init_called' failed!
Time to update this bug. Try with >=openal-1.14, >=pulseaudio-2 and >=mplayer-1.1. You can reopen this or bug 289463 if needed. *** This bug has been marked as a duplicate of bug 289463 ***