Segmentation fault in c

Please provide complete information as applicable to your setup.

• Hardware Platform (Jetson / GPU)
**• DeepStream Version 5.0
I am having segmentation fault in c pipeline.
please help in resolving error.
#include <gst/gst.h>

static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer data)
GMainLoop *loop = (GMainLoop *) data;
switch (GST_MESSAGE_TYPE (msg)) {
g_print (“End of stream\n”);
g_main_loop_quit (loop);
gchar *debug;
GError *error;
gst_message_parse_error (msg, &error, &debug);
g_free (debug);
g_printerr (“Error: %s\n”, error->message);
g_error_free (error);
g_main_loop_quit (loop);
return 1;

static void
cb_newpad (GstElement * decodebin, GstPad * decoder_src_pad, gpointer data)
g_print (“In cb_newpad\n”);
GstCaps *caps = gst_pad_get_current_caps (decoder_src_pad);
const GstStructure *str = gst_caps_get_structure (caps, 0);
const gchar *name = gst_structure_get_name (str);
GstElement *source_bin = (GstElement *) data;
GstCapsFeatures *features = gst_caps_get_features (caps, 0);

/* Need to check if the pad created by the decodebin is for video and not

  • audio. /
    if (!strncmp (name, “video”, 5)) {
    Link the decodebin pad only if decodebin has picked nvidia
    • decoder plugin nvdec_*. We do this by checking if the pad caps contain
    • NVMM memory features. /
      if (gst_caps_features_contains (features, GST_CAPS_FEATURES_NVMM)) {
      Get the source bin ghost pad */
      GstPad *bin_ghost_pad = gst_element_get_static_pad (source_bin, “src”);
      if (!gst_ghost_pad_set_target (GST_GHOST_PAD (bin_ghost_pad),
      decoder_src_pad)) {
      g_printerr (“Failed to link decoder src pad to source bin ghost pad\n”);
      gst_object_unref (bin_ghost_pad);
      } else {
      g_printerr (“Error: Decodebin did not pick nvidia decoder plugin.\n”);

static void
decodebin_child_added (GstChildProxy * child_proxy, GObject * object,
gchar * name, gpointer user_data)
g_print (“Decodebin child added: %s\n”, name);
if (g_strrstr (name, “decodebin”) == name) {
g_signal_connect (G_OBJECT (object), “child-added”,
G_CALLBACK (decodebin_child_added), user_data);

static GstElement *
create_source_bin (gchar * uri)
GstElement *bin = NULL, *uri_decode_bin = NULL;
gchar bin_name[16] = { };

//g_snprintf (bin_name, 15, “source-bin-%02d”, index);
/* Create a source GstBin to abstract this bin’s content from the rest of the

  • pipeline */
    bin = gst_bin_new (bin_name);

/* Source element for reading from the uri.

  • We will use decodebin and let it figure out the container format of the
  • stream and the codec and plug the appropriate demux and decode plugins. */
    uri_decode_bin = gst_element_factory_make (“uridecodebin”, “uri-decode-bin”);

if (!bin || !uri_decode_bin) {
g_printerr (“One element in source bin could not be created.\n”);
return NULL;

/* We set the input uri to the source element */
g_object_set (G_OBJECT (uri_decode_bin), “uri”, uri, NULL);

/* Connect to the “pad-added” signal of the decodebin which generates a

  • callback once a new pad for raw data has beed created by the decodebin */
    g_signal_connect (G_OBJECT (uri_decode_bin), “pad-added”,
    G_CALLBACK (cb_newpad), bin);
    g_signal_connect (G_OBJECT (uri_decode_bin), “child-added”,
    G_CALLBACK (decodebin_child_added), bin);

gst_bin_add (GST_BIN (bin), uri_decode_bin);

/* We need to create a ghost pad for the source bin which will act as a proxy

  • for the video decoder src pad. The ghost pad will not have a target right
  • now. Once the decode bin creates the video decoder and generates the
  • cb_newpad callback, we will set the ghost pad target to the video decoder
  • src pad. */
    if (!gst_element_add_pad (bin, gst_ghost_pad_new_no_target (“src”,
    GST_PAD_SRC))) {
    g_printerr (“Failed to add ghost pad in source bin\n”);
    return NULL;

return bin;

gint main (gint argc, gchar *argv)
GMainLoop *loop;
GstElement *pipeline, *src, *depay, *avdec, *videorate, *capsfilterRate, *jpegenc, *multifilesink, *sink;
GstBus *bus;
guint bus_watch_id;

/* init GStreamer */
gst_init (&argc, &argv);
loop = g_main_loop_new (NULL, FALSE);

/* setup */
pipeline = gst_pipeline_new (“pipeline”);

bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
gst_bus_add_watch (bus, bus_call, loop);
gst_object_unref (bus);

if (argc < 2) {
g_printerr (“Usage: %s \n”, argv[0]);
return -1;

/* Standard GStreamer initialization */
gst_init (&argc, &argv);
loop = g_main_loop_new (NULL, FALSE);

/* Create gstreamer elements /
Create Pipeline element that will form a connection of other elements */
pipeline = gst_pipeline_new (“pipeline”);

//src = gst_element_factory_make (“rtspsrc”,“rtspsrc”);

GstPad *sinkpad, *srcpad;
gchar pad_name[16] = { };
GstElement *source_bin = create_source_bin (argv[1]);

if (!source_bin) {
g_printerr (“Failed to create source bin. Exiting.\n”);
return -1;

gst_bin_add (GST_BIN (pipeline), source_bin);

//g_snprintf (pad_name, 15, "sink_%u", i);
sinkpad = gst_element_get_request_pad (sink, pad_name);
if (!sinkpad) {
  g_printerr ("Streammux request sink pad failed. Exiting.\n");
  return -1;

srcpad = gst_element_get_static_pad (source_bin, "src");
if (!srcpad) {
  g_printerr ("Failed to get src pad of source bin. Exiting.\n");
  return -1;

if (gst_pad_link (srcpad, sinkpad) != GST_PAD_LINK_OK) {
  g_printerr ("Failed to link source bin to stream muxer. Exiting.\n");
  return -1;

gst_object_unref (srcpad);
gst_object_unref (sinkpad);

depay = gst_element_factory_make (“rtph264depay”, “rtph264depay”);

avdec = gst_element_factory_make (“avdec_h264”, “avdec_h264”);

videorate = gst_element_factory_make (“videorate”, “videorate”);

capsfilterRate = gst_element_factory_make(“capsfilter”, “video-rate”);

GstCaps *capsRate = gst_caps_from_string (“video/x-raw,framerate=10/1”);
g_object_set ( capsfilterRate, “caps”, capsRate, NULL);
gst_caps_unref(capsRate);//again unref!

jpegenc = gst_element_factory_make(“jpegenc”, “jpegenc”);

sink = gst_element_factory_make(“multifilesink”, “multifilesink”);

/* we add a message handler */
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
bus_watch_id = gst_bus_add_watch (bus, bus_call, loop);
gst_object_unref (bus);

g_object_set (G_OBJECT (src), “location”, argv[1], NULL);

g_object_set (G_OBJECT (sink), “location”, “./frame%08d.jpg”, NULL);

//then add all elements together
gst_bin_add_many (GST_BIN (pipeline), src, depay, avdec, videorate, capsfilterRate, jpegenc, sink, NULL);

//link everythink after source
gst_element_link_many (depay, avdec, videorate, capsfilterRate, jpegenc, sink, NULL);

g_print (“Now playing:”);
g_print (" %s,", argv[1]);
g_print ("\n");
gst_element_set_state (pipeline, GST_STATE_PLAYING);

/* Wait till pipeline encounters an error or EOS */
g_print (“Running…\n”);
g_main_loop_run (loop);

/* Out of the main loop, clean up nicely */
g_print (“Returned, stopping playback\n”);
gst_element_set_state (pipeline, GST_STATE_NULL);
g_print (“Deleting pipeline\n”);
gst_object_unref (GST_OBJECT (pipeline));
g_source_remove (bus_watch_id);
g_main_loop_unref (loop);
return 0;

Do you want anyone to debug your code?

You need to debug the code by yourself. If you find anything wrong with Nvidia provided functions, you can report to us.

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