[Live-devel] RTP over RTSP broken with VLC and latest lib.

[Serge.Grondin at miranda.com]

Hi,

I don't if this problem was reported before, I just find out yesterday when
doing some testing with April 1st version.  Streaming over TCP is now
broken because of a recent change in the lib, I debugged it and this is the
faulty line file OnDemandSeverMediaSubsession.cpp (line 463)

  if (fRTCPInstance != NULL) {
    // Hack: Send an initial RTCP "SR" packet, before the initial RTP
packet, so that receivers will (likely) be able to
    // get RTCP-synchronized presentation times immediately:
    fRTCPInstance->sendReport();
  }

In TCP mode it is breaking the PLAY server answer to the client, here is
the Wireshark grab of the RTSP communication:


PLAY rtsp://10.6.4.140:5554/test/ RTSP/1.0
CSeq: 5
User-Agent: LibVLC/2.0.5 (LIVE555 Streaming Media v2012.09.13)
Session: 89934BBE
Range: npt=0.000-

$..8....N.....^..5.J...m............N.....ca-rd-sgrondin....RTSP/1.0 200 OK
<-------------------- PROBLEM ---------------
CSeq: 5
Date: Thu, Apr 11 2013 16:09:08 GMT
Range: npt=0.000-
Session: 89934BBE
RTP-Info:
url=rtsp://10.6.4.140:5554/test/track1;seq=18959;rtptime=3703760758


You see that a SR packet was inserted before the server answer, this will
disconnect any clients waiting the OK from the server.  Got the problem
with VLC and my own application.

Suggested fix:

if (dests->isTCP == False) {
  if (fRTCPInstance != NULL) {
    // Hack: Send an initial RTCP "SR" packet, before the initial RTP
packet, so that receivers will (likely) be able to
    // get RTCP-synchronized presentation times immediately:
    fRTCPInstance->sendReport();
  }
}

Thanks again for the great software library!

Serge









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