[e-blokos]

I'm trying to use librtmp with ffmpeg, but apparently librtmp doesn't accept live streaming as input with ffmpeg. I wrote to the author without answer until now. Is anyone as a solution to mux RTMP input sources (not recorded) and output in one RTMP stream with audio only ?
my test :
ffmpeg -re -i rtmp://myserver/live/stream1 -i rtmp://myserver/live/stream2 -i rtmp://myserver/live/stream3 -vn -acodec copy rtmp://myserver/live/newAudioStreamMixed

Thanks all