I am not familiar with either helix or the real player.
Helix is probably only designed for real media streaming while the real player requires some sort of addon/plugin to handle mms streams.
But i do know totem can play mms streams if that says theres is some error, try playing the stream in vlc or mplayer , in mplayer its Open->Player Url or via the terminal
Code:
mplayer mms://mms address here
Vlc File->Open Network Stream (Ctrl+N) or via the terminal
Code:
vlc mms://mms address
Or give the mms address here.
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