The VideoLAN Forums

Posted: **11 Jul 2007 18:39**

Is it possible to feed a unicast rtsp stream to VLC which then multicasts it w/o transcoding in a LAN?

Posted: **11 Jul 2007 21:43**

Yes it is.

vlc <input> --sout "#std{access=upd,mux=ts,dst=239.255.1.1:1234}"

will multicast the input on udp://@239.255.1.1:1234 .
Make sure to change the ttl if you're routing the multicast (example: --ttl 12)

Posted: **12 Jul 2007 17:23**

Thanks for that. I can get it to work that way with an rtsp input stream from a hardware mpeg4 encoder (rtsp://172.16.1.26:7070)

Now I'd like to generate test rtsp streams with VLC, instead of with the mpeg4 encoder. These streams shall be received by a VLC client instance running on another PC in the LAN
The VLC client shall use the same url, e.g. rtsp://172.16.1.26:7070 (so without anything behind the port number)
What is the cmd line for the VLC sender?

I tried:

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vlc -vvv <input> --sout '#rtp{dst=172.16.1.26,port=7070,sdp=rtsp://172.16.1.26:7070}'

but it won't work, the client VLC says:

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main debug: creating demux: access='rtsp' demux='' path=172.16.1.26:7070
main debug: looking for access_demux module: 1 candidate
live555 error: describeURL failed (cannot handle DESCRIBE response: RTSP/1.0 404 Not found)

Update: I got a bit further by using this cmd line on VLC server:

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vlc -vvv <input> --sout '#rtp{dst=172.16.1.26,port=7070,sdp=rtsp://172.16.1.26:7070/test.sdp}'

and on the client:

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http://172.16.1.26:7070/test.sdp

However, with whatever input file I choose, the client only plays audio. For the video I always get a getsocket error:

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live555 warning: RTP subsession 'video/MP4V-ES' failed (getsockname() error: Unknown error)

Update: this is solved, see viewtopic.php?f=2&t=39061 (a reboot was sufficient ...)

Furthermore, the url on the client is not what I want. How can I configure the server such that I can use this url on the player:

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rtsp://172.16.1.26:7070

Posted: **17 Jul 2007 16:52**

Try removing /test.sdp on the server's command line.

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