dynamically adding udpsrc to rtpbin causes streaming stopped, reason not-linked (-1)

[Ankur Deep Jaiswal]

Hi,

i am trying to add a udp src dynamically to a running pipeline.
e.g

      void addAudioSource(std::string const ip, int const port, int const
payloadtype)
      {
        std::string description = "autoaudiosrc ! queue ! audioconvert !
audio/x-raw,rate=16000 ! avenc_g722 ! rtpg722pay";

        audiosrc = Gst::Parse::create_bin(description, true);

        pipeline->add(audiosrc);
        {
          auto srcpad = audiosrc->get_static_pad("src");
          auto sinkpad = rtpbin->get_request_pad("send_rtp_sink_1");
          srcpad->link(sinkpad);
        }

        rtpudpsinkAudio->set_property("host", ip);
        rtpudpsinkAudio->set_property("port", port);
        rtpudpsinkAudio->set_property("sync",true);
        rtpudpsinkAudio->set_property("async",false);
        pipeline->add(rtpudpsinkAudio);
        {
          auto srcpad = rtpbin->get_static_pad("send_rtp_src_1");
          auto sinkpad = rtpudpsinkAudio->get_static_pad("sink");
          srcpad->link(sinkpad);
        }
        pipeline->set_state(Gst::State::STATE_PLAYING);
    }

--- and ---

      void addAudioSink(std::string const ip, int const port, int const
payloadtype)
      {
        char const caps[] =
"application/x-rtp,media=(string)audio,clock-rate=(int)8000,payload=(int)%d";
        char buffer[128] = {0};
        sprintf(buffer,caps,payloadtype);
        pipeline->add(rtpudpsrcAudio);
        rtpudpsrcAudio->set_property("caps",
            Gst::Caps::create_from_string(buffer));
        {
          auto srcpad = rtpudpsrcAudio->get_static_pad("src");
          auto sinkpad = rtpbin->get_request_pad("recv_rtp_sink_1");
          srcpad->link(sinkpad);
        }
        pipeline->set_state(Gst::State::STATE_PLAYING);
      }

individually when i am not calling the other function the pipeline works
fine.

if i try to call addAudioSink some time after addAudioSource  , i always
get this error when i debug through the application

0:00:18.190302584 [334m 6945 [00m 0x555556669450 [36mINFO   [00m
[00;01;34m           GST_EVENT gstevent.c:814:gst_event_new_caps: [00m
creating caps event application/x-rtp, media=(string)audio,
clock-rate=(int)8000, payload=(int)9, ssrc=(uint)1388635048
0:00:18.190323116 [334m 6945 [00m 0x555556669450 [36mINFO   [00m
[00m             basesrc
gstbasesrc.c:2965:gst_base_src_loop:<rtpudpsrcaudio-AVP-d80367f9-8361-458d-a52d-23db4d185996>
[00m pausing after gst_pad_push() = not-linked
0:00:18.190333169 [334m 6945 [00m 0x555556669450 [33;01mWARN   [00m
[00m             basesrc
gstbasesrc.c:3055:gst_base_src_loop:<rtpudpsrcaudio-AVP-d80367f9-8361-458d-a52d-23db4d185996>
[00m error: Internal data stream error.
0:00:18.190337616 [334m 6945 [00m 0x555556669450 [33;01mWARN   [00m
[00m             basesrc
gstbasesrc.c:3055:gst_base_src_loop:<rtpudpsrcaudio-AVP-d80367f9-8361-458d-a52d-23db4d185996>
[00m error: streaming stopped, reason not-linked (-1)
0:00:18.190350252 [334m 6945 [00m 0x555556669450 [36mINFO   [00m
[00;01;31;47m    GST_ERROR_SYSTEM
gstelement.c:2145:gst_element_message_full_with_details:<rtpudpsrcaudio-AVP-d80367f9-8361-458d-a52d-23db4d185996>
[00m posting message: Internal data stream error.
0:00:18.190358717 [334m 6945 [00m 0x555556669450 [36mINFO   [00m
[00;01;31;47m    GST_ERROR_SYSTEM
gstelement.c:2172:gst_element_message_full_with_details:<rtpudpsrcaudio-AVP-d80367f9-8361-458d-a52d-23db4d185996>
[00m posted error message: Internal data stream error.


the other thing is that this pipeline works most of the time.
i am only hit by this error when i debug through the application and
sometimes when on release build.

please help

-- 
Regards

Ankur Deep Jaiswal
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