[Live-devel] IP cameras, DHCP and IPv6

[Ulrich Teichert]

Hi,

I came across an IP camera which, in my opinion, behaves wrong when set to DHCP on an Pv4 network.
The camera replies on a RTSP-setup command from a IPv4 address with a SDP-lines like:

o=- 26064995877 26064995877 IN IP4 10.10.0.129
s=Media Presentation
e=NONE
b=AS:5050
t=0 0
a=control:rtsp://10.10.0.129/Streaming/channels/1/picture/
m=video 0 RTP/AVP 96
c=IN IP6 ::
b=AS:5000
a=recvonly
a=x-dimensions:1920,1080
a=control:rtsp://10.10.0.129/Streaming/channels/1/picture/trackID=1
a=rtpmap:96 H264/90000
a=fmtp:96 profile-level-id=420029; packetization-mode=1; sprop-parameter-sets=Z00AKp2oHgCJ+WbgICAoAAADAAgAAAMBlCA=,aO48gA==
a=Media_header:MEDIAINFO=494D4B48010300000400000100000000000000000000000000000000000000000000000000000000;
a=appversion:1.0

And I think the o= line conflicts with the c= line. I know that the camera has an IPv4 address (as can be seen in
the o= line) and the connect comes from an IPv4 address. So, in my opinion, the camera should answer with
"c=IN IP4 0.0.0.0", if nothing special is required. Would answering with "c=IN IP6 ::" be covered by the standard
in this case? I think not.

To make our client happy again, I came up with a quick hack, which I am attaching here. I don't believe this
would be acceptable as patch into live555, but it solved my immediate problem.

And this leads to another question: would manipulating the SDP lines before calling MediaSession::createNew
be a possible solution, too? It would still be a hack, I know, but when that's a supported interface (and will
be available in the forseeable future as well), I would feel much better ;-)

CU,
Uli
Ulrich Teichert
Sr. Software Engineer, Technology Development Center VSS
Luminator Technology Group 
P: +49 (4321) 539895-13
ulrich.teichert at luminator.com
https://www.luminator.com

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