Hi experts, I am trying to write a pipeline for receiving and decoding H.264 RTP packets. Please see the C codes below. It is basically equivalent to following pipeline. <pre class="programlisting">gst-launch -v gstrtpbin name=rtpbin \ udpsrc caps="application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H264" \ port=5000 ! rtpbin.recv_rtp_sink_0 \ rtpbin. ! rtph264depay ! ffdec_h264 ! xvimagesink \ </pre> But I couldn't link gstrtpbin and rtph264depay. The error message is as follows: 0:00:00.135605335 5934 0x95aa008 INFO GST_ELEMENT_PADS gstutils.c:1587:gst_element_link_pads: trying to link element gst-rtp-bin:(any) to element rtp-decoder:(any) 0:00:00.135657988 5934 0x95aa008 INFO GST_ELEMENT_PADS gstelement.c:970:gst_element_get_static_pad: no such pad 'recv_rtp_src_%d_%d_%d' in element "gst-rtp-bin" 0:00:00.135679108 5934 0x95aa008 INFO GST_ELEMENT_PADS gstutils.c:1208:gst_element_get_compatible_pad:<gst-rtp-bin> Could not find a compatible pad to link to rtp-decoder:sink Could someone give me some hints? Why I have no "recv_rtp_src_%d_%d_%d"? Or could someone lead me to similar examples? Thanks in advance! Regards, Qin static GstElement* construct_receiver_pipeline(void){ GstElement *pipeline, *gstrtpbin, *vdec, *rtpdec, *vsink; GstElement *jitterbuf, *vconv; GstElement *udpsrc_rtp; GstCaps *caps; GstPad *pad; gboolean err; GstPadLinkReturn res; //Create gstrtpbin gstrtpbin = gst_element_factory_make("gstrtpbin", "gst-rtp-bin"); if ( !gstrtpbin ) { g_printerr("Failed to create gstrtpbin\n"); return 0; } g_object_set(G_OBJECT (jitterbuf), "latency", jitter_latency, NULL); //RTP ource initialization udpsrc_rtp = gst_element_factory_make("udpsrc", "udp-udpsrc_rtp"); if ( !udpsrc_rtp ) { g_printerr("Failed to create udpsrc\n"); return 0; } g_object_set(G_OBJECT (udpsrc_rtp), "port", rtp_port, NULL); //gst_caps_new_simple and gst_element_linked_filter don't work g_object_set(G_OBJECT (udpsrc_rtp), "caps", gst_caps_from_string("application/x-rtp, " "clock-rate=(int)90000, " "payload=(int)96, " "media=(string)video, " "encoding-name=(string)H264"), NULL); //Create video decoder vdec = gst_element_factory_make(vdecoder, "video-decoder"); if ( !vdec ) { g_printerr("Failed to create %s\n", vdecoder); return 0; } //Choose RTP decoder according to video codec rtpdecoder = g_strdup(select_rtp_decoder(vdecoder)); g_free(vdecoder); //Create rtp decoder rtpdec = gst_element_factory_make(rtpdecoder, "rtp-decoder"); if ( !rtpdec ) { g_printerr("Failed to create %s\n", rtpdecoder); return 0; } //Create video converter vconv = gst_element_factory_make("ffmpegcolorspace", "video-converter"); if ( !vconv ) { g_printerr("Failed to create ffmpegcolorspace\n"); return 0; } //Create video sink vsink = gst_element_factory_make("xvimagesink", "video-sink"); if ( !vsink ) { g_printerr("Failed to create xvimagesink\n"); return 0; } /* Set up the pipeline */ gst_bin_add_many(GST_BIN (pipeline), udpsrc_rtp, gstrtpbin/*, jitterbuf*/, rtpdec, vdec, vconv, vsink, NULL); //link udpsrc_rtp to gstrtpbin pad = gst_element_get_request_pad(gstrtpbin, "recv_rtp_sink_%d"); if ( !pad ) { g_printerr("Failed to create pad\n"); return 0; } res = gst_pad_link(gst_element_get_pad(udpsrc_rtp, "src"), pad); gst_object_unref(GST_OBJECT (pad)); if ( GST_PAD_LINK_FAILED(res) ) { g_printerr("Failed to link pads\n"); return 0; } err = gst_element_link_many(gstrtpbin, rtpdec, vdec, vconv, vsink, NULL); if ( err==FALSE ) { g_printerr("Failed to link elements\n"); return 0; } return pipeline; }