Some media players still generate the playlist with EXTM3U entries, XMMS as an example, and such entries make mpg321 end with an error.
According to the lacking documentation I found EXTM3U is deprecated: http://www.gonze.com/playlists/playlist-format-survey.html#M3U
I've attached a patch that skips the EXTM3U entries of the playlist.
Skips entries of EXTM3U on the playlist