[Live-devel] RTP over TCP problem in the latest version of library

[Ross Finlayson]

>I have a few problems. I downloaded the latest version of LiveMedia 
>library 2010.06.22 and RTPoverTCP streaming ( RTSPClient ) suddenly 
>stopped working. In the previous version I tested - 2010.06.11 
>everything was working ok.

Please send us the (publically-accessible) "rtsp://" URL of a server 
that illustrates this problem.  (Recent changes to the RTP-over-TCP 
implementation actually *fixed* some bugs, so it's a bit surprising 
to hear that bugs might have been introduced here.)


>Wireshark log shows that RTSPClient sends some commands my cameras 
>don't recognize, RTCP packets probably, and they return RTSP/1.0 
>RTSP 505 Version not supported in response, but it is exactly how it 
>worked in the previous version - and there was no problem. Is there 
>a simple way to turn off RTCP in RTCPClient ?

No.  RTCP is a mandatory part of the RTP/RTCP standard.  If your 
server (camera) is not recognizing incoming RTCP packets, then it's 
not standards-compliant.  (If, however, your server is returning a 
RTSP error response each time it receives such a packet, then it's 
conceivable that this might be confusing the current RTSPClient 
implementation, in which case we'll take a look at this.  But again, 
please send us the (publically-accessible) "rtsp://" URL of a server 
that illustrates this problem.)


>  By the way, is TCP using some blocking calls ?

Not anymore!  This was fixed in the recent reimplementation of "RTSPClient".


>And the last issue not related to TCP. Many network cameras announce 
>their SDP session with c=IN IP 0.0.0.0 ( they have no separated SDP 
>description  for multicast sessions ) . Is there a way to enforce 
>multicast on such connections ? It worked in the previous versions, 
>but now it doesn't. I think it was usable feauture, so maybe there 
>is a chance to add it to the latest version ...

Are you referring to the "forceMulticastOnUnspecified" Boolean flag 
in "RTSPClient:: setupMediaSubsession()"?  Do you set this flag to 
True in your client application?

I deliberately disabled this functionality in the latest "RTSPClient" 
implementation, because I wanted to see if anyone still used it and 
wanted it.  If it is still being used, then I'll re-enable it in the 
next release of the software.
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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