Hi,
When using a brand new axis camera, I stumbled upon the so-called
"keep-alive" problem: the camera stops sending packets to my client
after 60 secs. or so.
I tested this also with the openRTSP test program (the output is in the
end of this message).
My questions are:
1) I suppose that openRTSP (and the RTSPClient class) sends periodic
RTCP sender reports (based on RTSPClient source code) to the camera. Am
I correct ? (i.e. no special custom implementation is needed to achieve
this).
2) .. and that should be enough to keep the camera sending those frames,
right ?
3) So maybe this a problem of the camera not fullfilling the protocol .. ?
When trying with vlc, I can see that vlc sends periodic "GET_PARAMETER"
commands to the camera and - supposedly because of this - the camera
does not kill the stream.
4) Is sending periodic "GET_PARAMETER" command a legitimate way of
keeping the connection up and alive or simply a "hack" that is widespread ?
(I'm using "v2016.02.22" of live555)
Regards,
Sampsa
[OpenRTSP output]
sampsa@sampsa-xps13:~/live555/live/testProgs$ ./testRTSPClient
rtsp://root:nordic12345@192.168.1.90/axis-media/media.amp
Opening connection to 192.168.1.90, port 554...
...remote connection opened
Sending request: DESCRIBE
rtsp://root:nordic12345@192.168.1.90/axis-media/media.amp RTSP/1.0
CSeq: 2
User-Agent: ./testRTSPClient (LIVE555 Streaming Media v2016.02.22)
Accept: application/sdp
Received 784 new bytes of response data.
Received a complete DESCRIBE response:
RTSP/1.0 200 OK
CSeq: 2
Content-Type: application/sdp
Content-Base: rtsp://192.168.1.90/axis-media/media.amp/
Server: GStreamer RTSP server
Date: Tue, 23 Aug 2016 12:14:09 GMT
Content-Length: 579
v=0
o=- 1188340656180883 1 IN IP4 192.168.1.90
s=Session streamed with GStreamer
i=rtsp-server
t=0 0
a=tool:GStreamer
a=type:broadcast
a=range:npt=now-
a=control:rtsp://192.168.1.90/axis-media/media.amp
m=video 0 RTP/AVP 96
c=IN IP4 0.0.0.0
b=AS:50000
a=rtpmap:96 H264/90000
a=fmtp:96
packetization-mode=1;profile-level-id=420029;sprop-parameter-sets=Z0IAKeKQCgC3YC3AQEB4eJEV,aM48gA==
a=control:rtsp://192.168.1.90/axis-media/media.amp/stream=0
a=framerate:20.000000
a=transform:-1.000000,0.000000,0.000000;0.000000,-1.000000,0.000000;0.000000,0.000000,1.000000
[URL:"rtsp://192.168.1.90/axis-media/media.amp/"]: Got a SDP description:
v=0
o=- 1188340656180883 1 IN IP4 192.168.1.90
s=Session streamed with GStreamer
i=rtsp-server
t=0 0
a=tool:GStreamer
a=type:broadcast
a=range:npt=now-
a=control:rtsp://192.168.1.90/axis-media/media.amp
m=video 0 RTP/AVP 96
c=IN IP4 0.0.0.0
b=AS:50000
a=rtpmap:96 H264/90000
a=fmtp:96
packetization-mode=1;profile-level-id=420029;sprop-parameter-sets=Z0IAKeKQCgC3YC3AQEB4eJEV,aM48gA==
a=control:rtsp://192.168.1.90/axis-media/media.amp/stream=0
a=framerate:20.000000
a=transform:-1.000000,0.000000,0.000000;0.000000,-1.000000,0.000000;0.000000,0.000000,1.000000
[URL:"rtsp://192.168.1.90/axis-media/media.amp/"]: Initiated the
"video/H264" subsession (client ports 54028-54029)
Sending request: SETUP rtsp://192.168.1.90/axis-media/media.amp/stream=0
RTSP/1.0
CSeq: 3
User-Agent: ./testRTSPClient (LIVE555 Streaming Media v2016.02.22)
Transport: RTP/AVP;unicast;client_port=54028-54029
Received 237 new bytes of response data.
Received a complete SETUP response:
RTSP/1.0 200 OK
CSeq: 3
Transport:
RTP/AVP;unicast;client_port=54028-54029;server_port=50000-50001;ssrc=DDB8A9EB;mode="PLAY"
Server: GStreamer RTSP server
Session: nejiZy3Kl7WBhINH; timeout=60
Date: Tue, 23 Aug 2016 12:14:09 GMT
[URL:"rtsp://192.168.1.90/axis-media/media.amp/"]: Set up the
"video/H264" subsession (client ports 54028-54029)
[URL:"rtsp://192.168.1.90/axis-media/media.amp/"]: Created a data sink
for the "video/H264" subsession
Sending request: PLAY rtsp://192.168.1.90/axis-media/media.amp RTSP/1.0
CSeq: 4
User-Agent: ./testRTSPClient (LIVE555 Streaming Media v2016.02.22)
Session: nejiZy3Kl7WBhINH
Range: npt=0.000-
Received 244 new bytes of response data.
Received a complete PLAY response:
RTSP/1.0 200 OK
CSeq: 4
RTP-Info:
url=rtsp://192.168.1.90/axis-media/media.amp/stream=0;seq=627;rtptime=1087975871
Range: npt=now-
Server: GStreamer RTSP server
Session: nejiZy3Kl7WBhINH; timeout=60
Date: Tue, 23 Aug 2016 12:14:09 GMT
[URL:"rtsp://192.168.1.90/axis-media/media.amp/"]: Started playing
session...
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
73237 bytes. Presentation time: 1471954453.082768!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
9293 bytes. Presentation time: 1471954453.142779!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
8553 bytes. Presentation time: 1471954453.182767!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
8509 bytes. Presentation time: 1471954453.242767!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
7413 bytes. Presentation time: 1471954453.282767!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
7109 bytes. Presentation time: 1471954453.342755!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
6689 bytes. Presentation time: 1471954453.382766!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
6809 bytes. Presentation time: 1471954453.442766!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
6277 bytes. Presentation time: 1471954453.482766!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
6029 bytes. Presentation time: 1471954453.542766!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
6005 bytes. Presentation time: 1471954453.582766!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
6169 bytes. Presentation time: 1471954453.642766!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
5825 bytes. Presentation time: 1471954453.682766!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
5561 bytes. Presentation time: 1471954453.742766!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
5545 bytes. Presentation time: 1471954453.782777!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
5821 bytes. Presentation time: 1471954453.842765!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
5493 bytes. Presentation time: 1471954453.882776!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
5261 bytes. Presentation time: 1471954453.942776!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
5373 bytes. Presentation time: 1471954453.982764!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
5469 bytes. Presentation time: 1471954454.042764!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
69773 bytes. Presentation time: 1471954454.082764!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
9109 bytes. Presentation time: 1471954454.142775!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
8373 bytes. Presentation time: 1471954454.182763!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
8045 bytes. Presentation time: 1471954454.242763!
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
7253 bytes. Presentation time: 1471954450.998845
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
6789 bytes. Presentation time: 1471954451.058833
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
6185 bytes. Presentation time: 1471954451.098833
...
...
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
795 bytes. Presentation time: 1471954514.599226
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
840 bytes. Presentation time: 1471954514.659214
Stream "rtsp://192.168.1.90/axis-media/media.amp/"; video/H264: Received
847 bytes. Presentation time: 1471954514.699236
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