<div dir="ltr">I am not familiar with your camera and not overly familiar with RTP receive in the GStreamer 1.0 series. However, I think that the best way to start debugging this problem would be to get a packet capture. To me it looks like you might be receiving 2 RTP streams, one current and one that never shutdown previously. A packet capture would help you resolve that, and look at the actual data stream. Beyond that you should enable logging on the RTSP src element and the RTP depayloader. If you are using Linux, then 'export GST_DEBUG=rtspsrc:5, rtph264depay:5' or something like that, the rtp depayloader name may not be correct. <div><div class="gmail_extra"> <div class="gmail_quote">On Wed, Aug 12, 2015 at 4:04 AM, Guillermo Rodriguez Garcia <<a href="mailto:guille.rodriguez@gmail.com" target="_blank">guille.rodriguez@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello all, I am experiencing internal data flow errors when trying to display video over RTSP from a Hikvision NVR (specifically it is a DS-7616NI-SP). I have tested both playbin and a custom pipeline using rtspsrc ! fakesink (this was in order to discard decoding problems). In both cases the result is the same: The video is shown briefly (typically for a second or less..), or not shown at all, then I get an "internal data flow error" with reason: not-linked and the pipeline is stopped. I have not seen this before with other IP cameras, so it might be a problem with the Hikvision NVR. However the same stream works just fine in VLC -- so it could also be a GStreamer issue. I am attaching the traces for the playbin test. I am hoping someone have come through this before. Any pointers on how to debug this further will be much appreciated. GStreamer version: 1.2.4. Pipeline: gst-launch-1.0 playbin uri=rtsp://<a href="http://user:pass@192.168.1.2:554/Streaming/Channels/402" rel="noreferrer" target="_blank">user:pass@192.168.1.2:554/Streaming/Channels/402</a> Traces: Setting pipeline to PAUSED ... Pipeline is live and does not need PREROLL ... Progress: (open) Opening Stream Progress: (connect) Connecting to rtsp://<a href="http://user:pass@192.168.1.2:554/Streaming/Channels/402" rel="noreferrer" target="_blank">user:pass@192.168.1.2:554/Streaming/Channels/402</a> Progress: (open) Retrieving server options Progress: (open) Retrieving media info Progress: (request) SETUP stream 0 Progress: (open) Opened Stream Setting pipeline to PLAYING ... New clock: GstSystemClock Progress: (request) Sending PLAY request Progress: (request) Sending PLAY request 0:00:00.536308746 5210 0x7fa23c026590 FIXME default gstutils.c:3648:gst_pad_create_stream_id_printf_valist:<fakesrc0:src> Creating random stream-id, consider implementing a deterministic way of creating a stream-id Progress: (request) Sent PLAY request 0:00:00.664987319 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 2361 != expected 6294 0:00:00.713419629 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 6294 != expected 2362 0:00:00.714901259 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 2362 != expected 6295 0:00:00.737791777 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 6295 != expected 2363 0:00:00.738965527 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 2363 != expected 6296 0:00:00.740601603 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 6296 != expected 2364 0:00:00.742137474 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 2364 != expected 6297 0:00:00.785908594 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 6297 != expected 2365 0:00:00.811117078 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 2366 != expected 6299 0:00:00.857399021 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 6299 != expected 2367 0:00:00.880911765 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 2367 != expected 6300 0:00:00.882411596 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 6300 != expected 2368 0:00:00.884551426 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 2368 != expected 6301 0:00:00.885663006 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1101:rtp_source_process_rtp: probation: seqnr 6301 != expected 2369 0:00:00.891674698 5210 0x7fa23c005ad0 WARN rtpjitterbuffer rtpjitterbuffer.c:183:rtp_jitter_buffer_set_clock_rate: Clock rate changed from 0 to 90000 0:00:00.891959967 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1096:rtp_source_process_rtp: unacceptable seqnum received 0:00:01.051441196 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1096:rtp_source_process_rtp: unacceptable seqnum received 0:00:01.058591456 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1096:rtp_source_process_rtp: unacceptable seqnum received 0:00:01.121773759 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1096:rtp_source_process_rtp: unacceptable seqnum received 0:00:01.128312634 5210 0x7fa224001630 WARN bufferpool gstbufferpool.c:632:gst_buffer_pool_set_config:<xvimagebufferpool0> can't change config, we are active 0:00:01.128465847 5210 0x7fa224001630 WARN bufferpool gstbufferpool.c:632:gst_buffer_pool_set_config:<xvimagebufferpool0> can't change config, we are active 0:00:01.153452983 5210 0x7fa23c005ad0 WARN rtpsource rtpsource.c:1096:rtp_source_process_rtp: unacceptable seqnum received 0:00:01.193700362 5210 0x7fa23c005ad0 WARN basesrc gstbasesrc.c:2865:gst_base_src_loop:<udpsrc1> error: Internal data flow error. 0:00:01.193738482 5210 0x7fa23c005ad0 WARN basesrc gstbasesrc.c:2865:gst_base_src_loop:<udpsrc1> error: streaming task paused, reason not-linked (-1) ERROR: from element /GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0/GstRTSPSrc:source/GstUDPSrc:udpsrc1: Internal data flow error. Additional debug info: gstbasesrc.c(2865): gst_base_src_loop (): /GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0/GstRTSPSrc:source/GstUDPSrc:udpsrc1: streaming task paused, reason not-linked (-1) Execution ended after 0:00:00.658919466 Setting pipeline to PAUSED ... Setting pipeline to READY ... 0:00:01.248032576 5210 0x922720 WARN rtspsrc gstrtspsrc.c:4996:gst_rtspsrc_try_send:<source> receive interrupted 0:00:01.248125628 5210 0x922720 WARN rtspsrc gstrtspsrc.c:6904:gst_rtspsrc_pause:<source> PAUSE interrupted Setting pipeline to NULL ... Freeing pipeline ... Any hints? -- Guillermo Rodriguez Garcia <a href="mailto:guille.rodriguez@gmail.com">guille.rodriguez@gmail.com</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" rel="noreferrer" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </blockquote></div> </div></div></div>