This works to play the stream:

rtmpdump -r "rtmp://wms2.scahw.com.au:1935/live/" -a "live/" -W "http://www.triplem.com.au/brisbane/nowplaying/mmm_FM_Streaming_Player_20120305.swf" -p "http://www.triplem.com.au" -y "4mmm.stream" | mplayer -

I want to use ffserver to provide an mp3 from that source
This does NOT work, but if it did, I'm still not sure how make ffmpeg feed it to ffserver (or ffserver get it directly)

ffplay rtmp://wms2.scahw.com.au:1935/live live http://www.triplem.com.au/brisba_FM_Streaming_Player_20120305.swf http://www.triplem.com.au

Argument 'live' provided as input filename, but 'rtmp://wms2.scahw.com.au:1935/live' was already specified.