please help, we've got some strange problem with RTP/RSTP

[Peter BOCZ]

Hi,

here is some detailed information about the problem:

On 07/25/2011 10:22 PM, Marco Ballesio wrote:
> Hi,
>
> On Fri, Jul 22, 2011 at 6:43 AM, Farkas Levente<lfarkas at lfarkas.org>  wrote:
>> hi,
>> in short our rtsp server not working:-(
>> but neither:
>> - gst-rtsp-server,
>> - vlc's rtsp server,
>> - mplayer's live555.
>>
>> in a bit more detail, the setup:
>> - we've got high resolution 2MP, 3MP, 5MP and high fps 12-25 fps ip
>> cameras which has buildin rtsp server and can stream the video in rtsp.
>> - our network is not perfect. there are a few pc which are behind 2-3-4
>> switch (ie. the shortest path from one server to the client goes through
>> 2-3-4 switch).
>>
>> what is always working:
>> - if we connect from a pc directly to the ip cameras('s rtsp server)
>> then we can get the proper video stream even with gstreamer, vlc etc.
>>
>> what is not always working:
>> - if we create an rtsp server on pc (eg Wim's gst-rtsp-server) which do
>> nothing just re-transmit the rtp stream from the camera with this
>> pipeline on the server side:
>>
>> rtspsrc location=rtsp://admin:12345@192.168.209.209:554/h.264/ch1/main !
>> rtph264depay ! rtph264pay name=pay0 pt=96
>>
>> and on the client side with this:
>> gst-launch rtspsrc location="rtsp://192.168.209.200:8554/test" !
>> decodebin2 ! xvimagesink
>>
>> then on some network segment we've got gray images most of the time.
> Do you mean 100% gray images (same color for all the pixels) or a
> grayscale version of the images generated from the camera?
>

Images look like iframes are missing, i attached one.

>> we try to replace both the client and then server to vlc and mplayer
>> (just to know whether it's a gstreamer bug or not) and neither
>> combination working. but if we connect directly to the camera it's
>> always working with all clients.
>>
>> an even strange thing if we start to stream on the server side from an
>> mkv file (with the high resolution high fps file) than the same thing
>> happened on the client side. so the problem is not the source of the
>> rtps server.
>>
>> one small tipp: if we lower the mtu to 300 (!) then it's working, but
>> obviously we can't use this settings in a real environment.
> How are you proxying the stream? Maybe you can share some code.
>

I attached some wireshark log maybe it is helpful.

client_camera.txt includes the wireshark log when we connect directly to 
the camera.
pipeline on the client: gst-launch playbin2 
uri=rtsp://admin:12345@192.168.209.209:554/h.264/ch1/main
the picture is clear and good

client_rtsp.txt includes the wireshark log when we connect to our rtsp 
server. We are using Wim's  gst-rtsp-server. Here are the code from the 
rtsp server:

#include <gst/gst.h>
#include <gst/rtsp-server/rtsp-server.h>

int main (int argc, char *argv[])
{
   GMainLoop *loop;
   GstRTSPServer *server;
   GstRTSPMediaMapping *mapping;
   GstRTSPMediaFactory *factory;

   gst_init (&argc, &argv);

   loop = g_main_loop_new (NULL, FALSE);

   server = gst_rtsp_server_new ();
   mapping = gst_rtsp_server_get_media_mapping (server);
   factory = gst_rtsp_media_factory_new ();
   gst_rtsp_media_factory_set_launch (factory, "( rtspsrc 
location=rtsp://admin:12345@192.168.209.209:554/h.264/ch1/main ! 
rtph264depay ! rtph264pay name=pay0 pt=96 )");
   gst_rtsp_media_factory_set_shared (factory, TRUE);
   gst_rtsp_media_mapping_add_factory (mapping, "/test", factory);
   g_object_unref (mapping);
   gst_rtsp_server_attach (server, NULL);

   g_main_loop_run (loop);

   return 0;
}

pipeline on the client: gst-launch playbin2 
uri=rtsp://admin:12345@192.168.209.209:554/h.264/ch1/main
the picture is gray as you see in rtsp.png

if you need any more information, don't be shy to ask
thanks for your help in advance
best regards

Peter Bocz
> Regards
>
>> so what can be the problem? any help would be useful.
>>
>>
>> --
>>   Levente                               "Si vis pacem para bellum!"
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
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