segmentation fault in playing gstreamer pipeline

[Mayank Agarwal]

 Hi,

 I have written a simple application to play webm file below.

 #include <gst/gst.h>
> #include <glib.h>


 static gboolean
 bus_call (GstBus     *bus,
           GstMessage *msg,
>           gpointer    data)
 {
   GMainLoop *loop = (GMainLoop *) data;

   switch (GST_MESSAGE_TYPE (msg)) {

     case GST_MESSAGE_EOS:
       g_print ("End of stream\n");
       g_main_loop_quit (loop);
       break;

    case GST_MESSAGE_ERROR: {
       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);
       break;
   }


     default:
       break;
   }

   return TRUE;
}




 int main(int argc,char *argv[])
 {

 GMainLoop *loop;
 GstElement *htpsrc,*demuxer,*decoder,*ffmpeg,*sink;
 GstElement *pipeline;
 GstBus *bus;
 guint bus_watch_id;

 gst_init(&argc,&argv);

 loop = g_main_loop_new (NULL, FALSE);

 htpsrc = gst_element_factory_make("filesrc","htonesrc");

 demuxer = gst_element_factory_make("matroskademux","demux");

 decoder = gst_element_factory_make("vp8dec","vp8decoder");

 ffmpeg = gst_element_factory_make("ffmpegcolorspace","httpsrc");

 sink =  gst_element_factory_make("ximagesink","httpsrc");

 if(!htpsrc)
 {
 g_print("source element could not be created\n");
 return;
 }

 if(!demuxer)
 {
 g_print("demuxer element could not be created\n");
 return;
 }

 if(!decoder)
 {
 g_print("decoder element could not be created\n");
 return;
 }


 if(!ffmpeg)
 {
 g_print("ffmpeg element could not be created\n");
 return;
 }


 if(!sink)
 {
 g_print("sink element could not be created\n");
 return;
 }

 g_print("before creating pipeline \n");
 pipeline = gst_pipeline_new("basic_player");
 if(!pipeline)
 {
 g_printf("Pipeline could not be created");
 return;
 }


 g_object_set (G_OBJECT (htpsrc), "location", argv[1], NULL);

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

 gst_bin_add_many(GST_BIN (pipeline),htpsrc,demuxer,decoder,ffmpeg,sink);

 gst_element_link_many(htpsrc,demuxer,decoder,ffmpeg,sink);

 gst_element_set_state(pipeline,GST_STATE_PLAYING);

 g_print ("Rundsning...\n");
 g_main_loop_run (loop);

 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;


 on running the executable i am getting the following error:
 exampleone:20144): GStreamer-CRITICAL **: gst_object_unref: assertion
 `((GObject *) object)->ref_count > 0' failed

 (exampleone:20144): GStreamer-WARNING **: Name 'httpsrc' is not unique
 in bin 'basic_player', not adding
 Segmentation fault (core dumped)

 while the following pipeline is running fine:

 gst-launch souphttpsrc location=
http://video.webmfiles.org/big-buck-bunny_trailer.webm ! matroskademux
! vp8dec ! ffmpegcolorspace ! ximagesink

Please find complete log below:



:00:00.316319426 20230      0x1f65600 INFO                GST_INIT
gst.c:456:gst_init_check: initialized GStreamer successfully
0:00:00.317857074 20230      0x1f65600 INFO      GST_PLUGIN_LOADING
gstplugin.c:859:gst_plugin_load_file: plugin
"/usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstcoreelements.so"
loaded
0:00:00.318031251 20230      0x1f65600 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:374:gst_element_factory_create: creating element
"filesrc" named "htonesrc"
0:00:00.318548875 20230      0x1f65600 INFO        GST_ELEMENT_PADS
gstelement.c:728:gst_element_add_pad:<GstBaseSrc at 0x22a0080> adding pad
'src'
0:00:00.320590434 20230      0x1f65600 INFO      GST_PLUGIN_LOADING
gstplugin.c:859:gst_plugin_load_file: plugin
"/usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstmatroska.so" loaded
0:00:00.320789972 20230      0x1f65600 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:374:gst_element_factory_create: creating element
"matroskademux" named "demux"
0:00:00.321194515 20230      0x1f65600 INFO        GST_ELEMENT_PADS
gstelement.c:728:gst_element_add_pad:<GstMatroskaDemux at 0x22a8060>
adding pad 'sink'
0:00:00.323143688 20230      0x1f65600 INFO      GST_PLUGIN_LOADING
gstplugin.c:859:gst_plugin_load_file: plugin
"/usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstvp8.so" loaded
0:00:00.323336250 20230      0x1f65600 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:374:gst_element_factory_create: creating element
"vp8dec" named "vp8decoder"
0:00:00.323779132 20230      0x1f65600 INFO        GST_ELEMENT_PADS
gstelement.c:728:gst_element_add_pad:<GstBaseVideoCodec at 0x22adbf0>
adding pad 'sink'
0:00:00.323973401 20230      0x1f65600 INFO        GST_ELEMENT_PADS
gstelement.c:728:gst_element_add_pad:<GstBaseVideoCodec at 0x22adbf0>
adding pad 'src'
0:00:00.324577863 20230      0x1f65600 INFO      GST_PLUGIN_LOADING
gstplugin.c:859:gst_plugin_load_file: plugin
"/usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstffmpegcolorspace.so"
loaded
0:00:00.324746060 20230      0x1f65600 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:374:gst_element_factory_create: creating element
"ffmpegcolorspace" named "httpsrc"
0:00:00.325943932 20230      0x1f65600 INFO        GST_ELEMENT_PADS
gstelement.c:728:gst_element_add_pad:<GstBaseTransform at 0x22be040>
adding pad 'sink'
0:00:00.329914803 20230      0x1f65600 INFO        GST_ELEMENT_PADS
gstelement.c:728:gst_element_add_pad:<GstBaseTransform at 0x22be040>
adding pad 'src'
0:00:00.331701414 20230      0x1f65600 INFO      GST_PLUGIN_LOADING
gstplugin.c:859:gst_plugin_load_file: plugin
"/usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstximagesink.so" loaded
0:00:00.332159464 20230      0x1f65600 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:374:gst_element_factory_create: creating element
"ximagesink" named "httpsrc"
0:00:00.332686392 20230      0x1f65600 INFO        GST_ELEMENT_PADS
gstelement.c:728:gst_element_add_pad:<GstBaseSink at 0x22c4400> adding
pad 'sink'
before creating pipeline
0:00:00.333075046 20230      0x1f65600 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:374:gst_element_factory_create: creating element
"pipeline" named "basic_player"
0:00:00.333361625 20230      0x1f65600 INFO                 filesrc
gstfilesrc.c:374:gst_file_src_set_location: filename : location=
0:00:00.337114305 20230      0x1f65600 INFO                 filesrc
gstfilesrc.c:375:gst_file_src_set_location: uri      :
file:///home/ubuntu/gstreamer/5sept/location=

(exampleone:20230): GStreamer-CRITICAL **: gst_object_unref: assertion
`((GObject *) object)->ref_count > 0' failed

(exampleone:20230): GStreamer-WARNING **: Name 'httpsrc' is not unique
in bin 'basic_player', not adding
[2]+  Done                    gedit debugfile.txt
Segmentation fault (core dumped)




Regards,
Mayank