There are other ways to get both an A/V stream and an audio-only stream.
Use ffmpeg. Input 1 stream, send 2 streams to Wowza, one of which is audio-only.
Use Wowza 3.0.5+. You can turn off audio or video tracks in your Application.xml.
I have tested it and it works, like so:
Publish FMLE stream named “myStream” to Wowza “live” application.
Create a new live application called “livenovideo”.
Turn off video the Application.xml for the “livenovideo” application.
Create a live.stream file containing "rtsp://localhost:1935/live/myStream
Use StreamManager to start “live.stream” on application “livenovideo.”
Playback audio only:
vineethkdlr, you can upgrade to Wowza 3 for free.