Terrance Medina | 16 May 19:51 2013

SDP - trouble separating audio/video tracks

I'm streaming audio/video from an IP camera through VLC as the client. I have no documentation on the camera. I need to use rtsp to stream the audio and video channels separately, but I can't seem to get it to work here. Also, from the SDP message it appears to use Live555 v2009.09.28 as its rtsp server. On other cameras I've been able to use something like rtsp://ip:port/control, but it's not working for me here. Below is the sdp message:

Sending request: DESCRIBE rtsp://192.168.1.123/mpeg4 RTSP/1.0
CSeq: 3
User-Agent: LibVLC/2.0.5 (LIVE555 Streaming Media v2012.09.13)
Accept: application/sdp


Received 1308 new bytes of response data.
Received a complete DESCRIBE response:
RTSP/1.0 200 OK
CSeq: 3
Date: Sun, Jan 02 2000 23:48:34 GMT
Content-Base: rtsp://192.168.1.123/mpeg4/
Content-Type: application/sdp
Content-Length: 1147

v=0
o=- 946855189887438 1 IN IP4 192.168.1.123
s=RTSP/RTP stream from Network Video Server
i=mpeg4
t=0 0
a=tool:LIVE555 Streaming Media v2009.09.28
a=type:broadcast
a=control:*
a=range:npt=0-
a=x-qt-text-nam:RTSP/RTP stream from Network Video Server
a=x-qt-text-inf:mpeg4
m=video 0 RTP/AVP 96
c=IN IP4 0.0.0.0
b=AS:2500
a=rtpmap:96 H264/90000
a=fmtp:96 packetization-mode=1;profile-level-id=640028;sprop-parameter-sets=Z2QAKK2EBUViuKxUdCAqKxXFYqOhAVFYrisVHQgKisVxWKjoQFRWK4rFR0ICorFcVio6ECSFITk8nyfk/k/J8nm5s00IEkKQnJ5Pk/J/J+T5PNzZprQCgDzSpAAAAwHgAABwgYEAAJiWAACrqW974XhEI1A=,aO48sA==;config=0000000167640028ad84054562b8ac5474202a2b15c562a3a1015158ae2b151d080a8ac57158a8e84054562b8ac5474202a2b15c562a3a10248521393c9f27e4fe4fc9f279b9b34d081242909c9e4f93f27f27e4f93cdcd9a6b402803cd2a400000301e00000708181000098960000aba96f7be1784423500000000168ee3cb0
a=x-dimensions: 1280, 960
a=x-framerate: 30
a=control:track1
m=audio 0 RTP/AVP 96
c=IN IP4 0.0.0.0
b=AS:256
a=rtpmap:96 MPEG4-GENERIC/16000/2
a=fmtp:96 streamtype=5;profile-level-id=1;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3;config=1408
a=control:track2



Here's what I've tried:
rtsp://192.168.1.123/mpeg4 -- streams both a/v
rtsp://192.168.1.123/track1 -- error, your input can't be opened
rtsp://192.168.1.123/mpeg4/track1 -- error
rtsp//192.168.1.123/mpeg4#track1 -- streams both a/v
rtsp://192.168.1.123/foobar/mpeg4 -- streams both a/v
rtsp://192.168.1.123/mpeg4/foobar -- error

In the VLC toolbar, I can select Video-->VideoTrack-->Disable, to turn off the video, but I need to be able to do this with the rtsp url. Not sure if there's some finer point of the url syntax that I'm missing, but perusing the RFC's hasn't really helped so far.

Thanks!
_______________________________________________
live-devel mailing list
live-devel@...
http://lists.live555.com/mailman/listinfo/live-devel
Ross Finlayson | 16 May 21:54 2013

Re: SDP - trouble separating audio/video tracks

As a RTSP client, you can ask to stream just a single track, but *not* by specifying the track in the URL that you give to the RTSP "DESCRIBE" command.    (That URL must be one that represents the entire stream - i.e., in your example: "rtsp://192.168.1.123/mpeg4" )

Instead, the way you specify which track(s) you want is in the URL that you give to the RTSP "SETUP" command.  (The RTSP client will issue one "SETUP" command for each track that it wants.)  The RTSP "SETUP" command will use an URL that specifies each track that you want - i.e., in your example: "rtsp://192.168.1.123/mpeg4/track1"

This will be done automatically by your RTSP client application, if (and only if) it allows you to choose which track(s) you want.  Our "openRTSP" application does this (using the "-a" and/or "-v" options).  VLC (although it's not our application) apparently does as well, as you noted.


In the VLC toolbar, I can select Video-->VideoTrack-->Disable, to turn off the video, but I need to be able to do this with the rtsp url.

As I noted above, you can't do that.

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

_______________________________________________
live-devel mailing list
live-devel <at> lists.live555.com
http://lists.live555.com/mailman/listinfo/live-devel

Gmane