[rtmpdump] multiple sources

[E-Blokos]

Hi,

asked to ffmpeg and librtmp list without answer.
maybe here someone knows the trick.

is it possible to get multiple rtmp audio live (not recorded) source input and convert them in one audio stream ?
I tried with ffmpeg and librtmp like
ffmpeg -re -i rtmp://server/stream1 -i rtmp://server/stream2 -vn -acodec copy rtmp://server/newAudioStream
it says NetStream.Play.StreamNotFound 
any way with rtmpdump ?

Thanks

Franck
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