[Live-devel] All client streams slow down when using two live proxies connected together.

Tue Dec 3 22:45:40 PST 2013

So after some digging it appears the slow down I see when using TCP is due to a slow connection to the proxy. See the code in RTPInterface.cpp.

In the function RTPInterface::sendRTPorRTCPPacketOverTCP.

The first send of the header is non-blocking, the second send is blocking ( the last parameter on sendDataOverTCP is set to True, which forces a blocking send). It also causes a problem with a duplicate data being sent again, we see this on the client side.  Most clients seem to handle this but if your client is based off of the reference source (osrtspserver) it will fail.  It seems that a EAGAIN can still occur even if the data was sent.  I would guess the send must have succeed in this case?

So I see two issues:
1. The blocking call to the second send in sendDataOverTCP to send the data after the header can block for significant amount of time if the connection is slow. (slowing the entire event loop)
2. The second send must fail with EAGAIN, but still the data must have been sent.

I think send on a non-blocking socket can send paritial and you must check to see how much was sent and only send what is left over?

Craig

On 11/27/2013 12:46 PM, Craig Matsuura wrote:
Hi Ross,

I have a question.  Running two live555proxyServers and clients.  Using both openRTSP and gstreamer as clients.

Here is my setup.

 *   live proxy 1 (openRTSP 172.16.10.100) connect to camera
 *   Client 1 (172.16.10.100) connected to live proxy 1 (172.16.10.100)
 *   live proxy 2 (192.168.3.250) connect to live proxy 1
 *   Client 2 (gstream client 192.168.3.25) connect to live proxy 2

Both client 1 and client 2 slow down, when client 2 connects.  Is there a setting or configuration I can use to solve this problem.  slow down is much worse with client 2 is a gst playbin2.  We have seen this on other types of clients connecting TCP (as client 2).

We have a configuration where we need a proxy at once source and a proxy at a different source.  We want to use the same code base from live555.  We initial had different implementations, one based on live555 and another based on a different rtsp server, and did not have and slow down issues, but had other problems.

Below are the outputs and calling parameters on the proxies and openRTSP (client).

Thanks,.
Craig

Client are connecting via TCP (-t).
------------------------------------

192.168.3.250> ./openRTSP -V -t -Q -d 10  rtsp://192.168.3.250:8554/Video
Opened URL "rtsp://192.168.3.250:8554/Video"<rtsp://192.168.3.250:8554/Video>, returning a SDP description:
v=0
o=- 1385580361225980 1 IN IP4 192.168.3.250
s=LIVE555 Streaming Media v2013.11.26
i=LIVE555 Streaming Media v2013.11.26
t=0 0
a=tool:LIVE555 Streaming Media v2013.11.26
a=type:broadcast
a=control:*
a=range:npt=0-
a=x-qt-text-nam:LIVE555 Streaming Media v2013.11.26
a=x-qt-text-inf:LIVE555 Streaming Media v2013.11.26
m=video 0 RTP/AVP 96
c=IN IP4 0.0.0.0
b=AS:50
a=rtpmap:96 H264/90000
a=fmtp:96 packetization-mode=1;profile-level-id=64401F;sprop-parameter-sets=J2RAH6wsagFAFumoKDAqAAAH0gAB1MAo,KO4EYsA=
a=control:track1

Created receiver for "video/H264" subsession (client ports 39104-39105)
Setup "video/H264" subsession (client ports 39104-39105)
Created output file: "video-H264-1"
Started playing session
Receiving streamed data (for up to 10.000000 seconds)...
begin_QOS_statistics
subsession      video/H264
num_packets_received    290
num_packets_lost        0
elapsed_measurement_time        10.001134
kBytes_received_total   372.718000
measurement_sampling_interval_ms        1000
kbits_per_second_min    0.000000
kbits_per_second_ave    298.140591
kbits_per_second_max    1154.382976
packet_loss_percentage_min      0.000000
packet_loss_percentage_ave      0.000000
packet_loss_percentage_max      0.000000
inter_packet_gap_ms_min 0.002000
inter_packet_gap_ms_ave 26.072645
inter_packet_gap_ms_max 2007.246000
end_QOS_statistics

First live Proxy on pointed to second live proxy (Note 192.168.3.216 is port forward from the 172.16.10.100)
------------------------------------------------------------------------------------------------------------

192.168.3.250> ./live555ProxyServer.x86  rtsp://192.168.3.216/Video
LIVE555 Proxy Server
        (LIVE555 Streaming Media library version 2013.11.26)

RTSP stream, proxying the stream "rtsp://192.168.3.216/Video"<rtsp://192.168.3.216/Video>
        Play this stream using the URL: rtsp://192.168.3.250:8554/Video

(We use port 8000 for optional RTSP-over-HTTP tunneling.)

Second live Proxy pointed to camera to stream
---------------------------------------------

root at touchlink-847e405d04f4:~# ./live555ProxyServer -V rtsp://172.16.10.101:554/
live.sdpADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

LIVE555 Proxy Server
        (LIVE555 Streaming Media library version 2013.11.26)

Opening connection to 172.16.10.101, port 554...
RTSP stream, proxying the stream "rtsp://172.16.10.101:554/live.sdp"<rtsp://172.16.10.101:554/live.sdp>
        Play this stream using the URL: rtsp://172.16.10.100/Video

(We use port 80 for optional RTSP-over-HTTP tunneling.)
...remote connection opened
Sending request: DESCRIBE rtsp://172.16.10.101:554/live.sdp RTSP/1.0
CSeq: 2
User-Agent: ProxyRTSPClient (LIVE555 Streaming Media v2013.11.26)
Accept: application/sdp

Received 510 new bytes of response data.
Received a complete DESCRIBE response:
RTSP/1.0 200 OK
CSeq: 2
Date: Wed, 27 Nov 2013 12:25:5 GMT
Content-Base: rtsp://172.16.10.101/live.sdp/
Content-Type: application/sdp
Content-Length: 348

v=0
o=RTSP 1385555105 945 IN IP4 0.0.0.0
s=RTSP server
c=IN IP4 0.0.0.0
t=0 0
a=charset:Shift_JIS
a=range:npt=0-
a=control:*
a=etag:1234567890
m=video 0 RTP/AVP 98
b=AS:0
a=rtpmap:98 H264/90000
a=control:trackID=1
a=fmtp:98 packetization-mode=1; profile-level-id=64401f; sprop-parameter-sets=J2RAH6wsagFAFumoKDAqAAAH0gAB1MAo,KO4EYsA=

ProxyServerMediaSession["rtsp://172.16.10.101/live.sdp/"<rtsp://172.16.10.101/live.sdp/>] added new "ProxyServerMediaSubsession" for RTP/video/H264 track
Sending request: OPTIONS rtsp://172.16.10.101/live.sdp/ RTSP/1.0
CSeq: 3
User-Agent: ProxyRTSPClient (LIVE555 Streaming Media v2013.11.26)

Received 145 new bytes of response data.
Received a complete OPTIONS response:
RTSP/1.0 200 OK
CSeq: 3
Date: Wed, 27 Nov 2013 12:25:35 GMT
Public: OPTIONS, DESCRIBE, PLAY, SETUP, GET_PARAMETER, SET_PARAMETER, TEARDOWN

ProxyServerMediaSubsession["H264"]::createNewStreamSource(session id 0)
        Initiated: ProxyServerMediaSubsession["H264"]
ProxyServerMediaSubsession["H264"]::createNewRTPSink()
ProxyServerMediaSubsession["H264"]::closeStreamSource()
ProxyServerMediaSubsession["H264"]::createNewStreamSource(session id 3097014589)
Sending request: SETUP rtsp://172.16.10.101/live.sdp/trackID=1 RTSP/1.0
CSeq: 4
User-Agent: ProxyRTSPClient (LIVE555 Streaming Media v2013.11.26)
Transport: RTP/AVP;unicast;client_port=56926-56927

ProxyServerMediaSubsession["H264"]::createNewRTPSink()
Received 169 new bytes of response data.
Received a complete SETUP response:
RTSP/1.0 200 OK
CSeq: 4
Date: Wed, 27 Nov 2013 12:25:43 GMT
Session: 15618451;timeout=70
Transport: RTP/AVP;unicast;client_port=56926-56927;server_port=5580-5581

ProxyRTSPClient["rtsp://172.16.10.101/live.sdp/"<rtsp://172.16.10.101/live.sdp/>]::continueAfterSETUP(): head codec: H264; numSubsessions 1
        queue:  H264
Sending request: PLAY rtsp://172.16.10.101/live.sdp/ RTSP/1.0
CSeq: 5
User-Agent: ProxyRTSPClient (LIVE555 Streaming Media v2013.11.26)
Session: 15618451

Received 201 new bytes of response data.
Received a complete PLAY response:
RTSP/1.0 200 OK
CSeq: 5
Date: Wed, 27 Nov 2013 12:25:43 GMT
Session: 15618451;timeout=70
RTP-Info: url=rtsp://172.16.10.101/live.sdp/trackID=1;seq=0;rtptime=0
Range: npt=0-
RTCP-Interval: 250

Sending request: OPTIONS rtsp://172.16.10.101/live.sdp/ RTSP/1.0
CSeq: 6
User-Agent: ProxyRTSPClient (LIVE555 Streaming Media v2013.11.26)
Session: 15618451

Received 144 new bytes of response data.
Received a complete OPTIONS response:
RTSP/1.0 200 OK
CSeq: 6
Date: Wed, 27 Nov 2013 12:26:3 GMT
Public: OPTIONS, DESCRIBE, PLAY, SETUP, GET_PARAMETER, SET_PARAMETER, TEARDOWN

Sending request: OPTIONS rtsp://172.16.10.101/live.sdp/ RTSP/1.0
CSeq: 7
User-Agent: ProxyRTSPClient (LIVE555 Streaming Media v2013.11.26)
Session: 15618451

Received 145 new bytes of response data.
Received a complete OPTIONS response:
RTSP/1.0 200 OK
CSeq: 7
Date: Wed, 27 Nov 2013 12:26:41 GMT
Public: OPTIONS, DESCRIBE, PLAY, SETUP, GET_PARAMETER, SET_PARAMETER, TEARDOWN

Sending request: OPTIONS rtsp://172.16.10.101/live.sdp/ RTSP/1.0
CSeq: 8
User-Agent: ProxyRTSPClient (LIVE555 Streaming Media v2013.11.26)
Session: 15618451

Received 145 new bytes of response data.
Received a complete OPTIONS response:
RTSP/1.0 200 OK
CSeq: 8
Date: Wed, 27 Nov 2013 12:27:35 GMT
Public: OPTIONS, DESCRIBE, PLAY, SETUP, GET_PARAMETER, SET_PARAMETER, TEARDOWN

Sending request: OPTIONS rtsp://172.16.10.101/live.sdp/ RTSP/1.0
CSeq: 9
User-Agent: ProxyRTSPClient (LIVE555 Streaming Media v2013.11.26)
Session: 15618451

Received 145 new bytes of response data.
Received a complete OPTIONS response:
RTSP/1.0 200 OK
CSeq: 9
Date: Wed, 27 Nov 2013 12:28:27 GMT
Public: OPTIONS, DESCRIBE, PLAY, SETUP, GET_PARAMETER, SET_PARAMETER, TEARDOWN

Sending request: OPTIONS rtsp://172.16.10.101/live.sdp/ RTSP/1.0
CSeq: 10
User-Agent: ProxyRTSPClient (LIVE555 Streaming Media v2013.11.26)
Session: 15618451

Received 145 new bytes of response data.
Received a complete OPTIONS response:
RTSP/1.0 200 OK
CSeq: 10
Date: Wed, 27 Nov 2013 12:29:1 GMT
Public: OPTIONS, DESCRIBE, PLAY, SETUP, GET_PARAMETER, SET_PARAMETER, TEARDOWN

Sending request: OPTIONS rtsp://172.16.10.101/live.sdp/ RTSP/1.0
CSeq: 11
User-Agent: ProxyRTSPClient (LIVE555 Streaming Media v2013.11.26)
Session: 15618451

Received 145 new bytes of response data.
Received a complete OPTIONS response:
RTSP/1.0 200 OK
CSeq: 11
Date: Wed, 27 Nov 2013 12:30:1 GMT
Public: OPTIONS, DESCRIBE, PLAY, SETUP, GET_PARAMETER, SET_PARAMETER, TEARDOWN

Sending request: OPTIONS rtsp://172.16.10.101/live.sdp/ RTSP/1.0
CSeq: 12
User-Agent: ProxyRTSPClient (LIVE555 Streaming Media v2013.11.26)
Session: 15618451

Received 146 new bytes of response data.
Received a complete OPTIONS response:
RTSP/1.0 200 OK
CSeq: 12
Date: Wed, 27 Nov 2013 12:30:40 GMT
Public: OPTIONS, DESCRIBE, PLAY, SETUP, GET_PARAMETER, SET_PARAMETER, TEARDOWN

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