RTSP multicast examples

[ej]

Hello,

With the GStreamer RTSP server, two exaples are available to test multicast traffic.

I can not get them to work and I need some help.

On the server-side:

./test-multicast

stream ready at <a href="rtsp://127.0.0.1:8554/test" class="">rtsp://127.0.0.1:8554/test

On the client-side (same machine):

gst-launch-1.0 -v playbin uri=<a href="rtsp://10.0.2.15:8554/test" class="">rtsp://10.0.2.15:8554/test

......

......

Could not receive any UDP packets for 5,0000 seconds, maybe your firewall is blocking it. Retrying using a TCP connection.

ERROR: from element /GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0/GstRTSPSrc:source: Could not read from resource.

Additional debug info:

gstrtspsrc.c(6347): gst_rtspsrc_setup_streams (): /GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0/GstRTSPSrc:source:

Could not connect to server, no protocols left

I use Ubuntu 16.04.1. 

Multicast traffic works on my computer.

Tested with a "hello world" multicast socket c-program, so no problems with routes or so.

With Wireshark I see a correct reply with a RTP/SDP description to use multicast address 224.3.0.0

However I see no RTP packets from the server.

This is the log from the REPLY of the server on the DESCRIBE request of the client:

Internet Protocol Version 4, Src: 10.0.2.15, Dst: 10.0.2.15

Transmission Control Protocol, Src Port: 8554 (8554), Dst Port: 38752 (38752), Seq: 184, Ack: 595, Len: 448

Real Time Streaming Protocol

    Response: RTSP/1.0 200 OK\r\n

        Status: 200

    CSeq: 2\r\n

    Content-type: application/sdp

    Content-Base: <a href="rtsp://10.0.2.15:8554/test/\r\n" class="">rtsp://10.0.2.15:8554/test/\r\n

    Server: GStreamer RTSP server\r\n

    Date: Thu, 12 Jan 2017 17:38:07 GMT\r\n

    Content-length: 257

    \r\n

    Session Description Protocol

        Session Description Protocol Version (v): 0

        Owner/Creator, Session Id (o): - 2074017758225444218 1 IN IP4 10.0.2.15

        Session Name (s): Session streamed with GStreamer

        Session Information (i): rtsp-server

        Time Description, active time (t): 0 0

        Session Attribute (a): tool:GStreamer

        Session Attribute (a): type:broadcast

        Session Attribute (a): control:*

        Session Attribute (a): range:npt=0-

        Media Description, name and address (m): audio 0 RTP/AVP 8

        Connection Information (c): IN IP4 224.3.0.0/16

        Media Attribute (a): rtpmap:8 PCMA/8000

        Media Attribute (a): control:stream=0

When I use the example test_multicast2, the pipeline is established, but the RTP is send as unicast, not multicast.

In the RTP/SDP information I see type broadcast but no multicast address as Connection Information.

        Session Attribute (a): type:broadcast

Connection Information (c): IN IP4 0.0.0.0

What do I do wrong?

regards,

Ernst-Jan

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