<HTML><BODY>Hi, I'm trying to transmit RTP video stream through network via UDP protocol.Here is pipeline code on sender side:https://gist.github.com/mgalushka/68d8ee034849a7db4f1f234e73a41405 I can receive and see actual video if I run receiver with `gst-launch-1.0` command-line like this:gst-launch-1.0 -v udpsrc address=127.0.0.1 port=1234 caps="application/x-rtp" ! rtph263pdepay ! avdec_h263 ! autovideosinkBut I cannot see window with video when I execute receiver for same pipeline in **c** code. Here is pipeline code on receiver side (in full - because I believe here is error somewhere):void _receive_video_init_gstreamer(NiceAgent *magent, guint stream_id, CustomData *data) { GstElement *pipeline, *source, *capsfilter, *videoconvert, *h263p, *rtph263pdepay, *sink; GstBus *bus; GstMessage *msg; GstStateChangeReturn ret; GSource *bus_source; source = gst_element_factory_make ("udpsrc", "source"); rtph263pdepay = gst_element_factory_make ("rtph263pdepay", "rtph263pdepay"); h263p = gst_element_factory_make ("avdec_h263p", "h263p"); sink = gst_element_factory_make ("autovideosink", "sink"); g_object_set (source, "address", "127.0.0.1", NULL); g_object_set (source, "port", 1234, NULL); g_object_set (source, "caps", gst_caps_from_string("application/x-rtp"), NULL); g_object_set (sink, "sync", FALSE, NULL); pipeline = gst_pipeline_new ("Video receive pipeline"); if (!pipeline || !source || !h263p || !rtph263pdepay || !sink) { g_printerr ("Not all elements could be created.\n"); return; } gst_bin_add_many (GST_BIN (pipeline), source, rtph263pdepay, h263p, sink, NULL); if (gst_element_link_many (source, rtph263pdepay, h263p, sink, NULL) != TRUE) { g_printerr ("Elements could not be linked.\n"); gst_object_unref (pipeline); return; } bus = gst_element_get_bus (pipeline); gst_bus_enable_sync_message_emission (bus); gst_bus_add_signal_watch (bus); g_signal_connect (bus, "message::error", (GCallback) on_error, NULL); data->pipeline = pipeline; ret = gst_element_set_state(data->pipeline, GST_STATE_PLAYING); if (ret == GST_STATE_CHANGE_FAILURE) { g_printerr ("Unable to set the pipeline to the playing state.\n"); gst_object_unref (pipeline); return; } }Error onserved from code:WARN basesrc gstbasesrc.c:2943:void gst_base_src_loop(GstPad *):<source> error: Internal data flow error. WARN basesrc gstbasesrc.c:2943:void gst_base_src_loop(GstPad *):<source> error: streaming task paused, reason not-negotiated (-4) ERROR default gstreamer_utils.c:42:on_error: Error received from element source: Internal data flow error.How can I debug this issue?Thanks, Maxim.</BODY></HTML>