The FFmpeg documentation suggests this syntax:
However, this will give you an "Problem accessing the DNS." error when trying to connect to the Wowza server.rtmp://[username:password@]server[:port][/app][/instance][/playpath]
In this thread it is suggested to use Wowza SecureURLParams instead of RTMP authentication, when streaming from FFmpeg.
Is it still not possible to use FFmpeg with RTMP authentication?