[Bug 796351] New: Pipeline with single named bin inside is incorrectly created

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796351

            Bug ID: 796351
           Summary: Pipeline with single named bin inside is incorrectly
                    created
    Classification: Platform
           Product: GStreamer
           Version: 1.14.0
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bugzilla at poradnik-webmastera.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I tried to create pipeline which contained rtpbin with assigned name. Pipeline
was created successfully, but I was not able to get bin from pipeline -
gst_bin_get_by_name() returned NULL.

Example code:

#include <gst/gst.h>

int main(int argc, char* argv[])
{
  GOptionContext* context = g_option_context_new("");
  g_option_context_add_group(context, gst_init_get_option_group());
  g_option_context_parse(context, &argc, &argv, NULL);
  GMainLoop* loop = g_main_loop_new(NULL, FALSE);
  const char* p = "rtpbin name=bin";
  //GstElement* pipe = gst_parse_launch(p, NULL);
  GstElement* pipe = gst_parse_launch_full(p, NULL, GST_PARSE_FLAG_NONE, NULL);
  GstElement* bin = gst_bin_get_by_name(GST_BIN(pipe), "bin");
  g_assert_nonnull(bin);
  //gst_element_set_state(GST_ELEMENT(pipe), GST_STATE_PLAYING);
  g_main_loop_run(loop);
  return 0;
}

Logs:

# GST_DEBUG="*:4" ./test2
0:00:00.000197464 27515      0x1586800 INFO                GST_INIT
gst.c:586:init_pre: Initializing GStreamer Core Library version 1.14.0
0:00:00.000448052 27515      0x1586800 INFO                GST_INIT
gst.c:587:init_pre: Using library installed in
/home/daniel/cerbero/build/dist/linux_x86_64/lib
0:00:00.000480487 27515      0x1586800 INFO                GST_INIT
gst.c:607:init_pre: Linux daniel.localdomain 3.10.0-693.21.1.el7.x86_64 #1 SMP
Wed Mar 7 19:03:37 UTC 2018 x86_64
0:00:00.001184472 27515      0x1586800 INFO                GST_INIT
gstmessage.c:127:_priv_gst_message_initialize: init messages
0:00:00.002469879 27515      0x1586800 INFO                GST_INIT
gstcontext.c:84:_priv_gst_context_initialize: init contexts
0:00:00.002989245 27515      0x1586800 INFO      GST_PLUGIN_LOADING
gstplugin.c:317:_priv_gst_plugin_initialize: registering 0 static plugins
0:00:00.003220841 27515      0x1586800 INFO      GST_PLUGIN_LOADING
gstplugin.c:225:gst_plugin_register_static: registered static plugin
"staticelements"
0:00:00.003287932 27515      0x1586800 INFO      GST_PLUGIN_LOADING
gstplugin.c:227:gst_plugin_register_static: added static plugin
"staticelements", result: 1
0:00:00.003405086 27515      0x1586800 INFO            GST_REGISTRY
gstregistry.c:1727:ensure_current_registry: reading registry cache:
/root/.cache/gstreamer-1.0/registry.x86_64.bin
0:00:00.045722933 27515      0x1586800 INFO            GST_REGISTRY
gstregistrybinary.c:621:priv_gst_registry_binary_read_cache: loaded
/root/.cache/gstreamer-1.0/registry.x86_64.bin in 0.042258 seconds
0:00:00.045827509 27515      0x1586800 INFO            GST_REGISTRY
gstregistry.c:1583:scan_and_update_registry: Validating plugins from registry
cache: /root/.cache/gstreamer-1.0/registry.x86_64.bin
0:00:00.048939530 27515      0x1586800 INFO            GST_REGISTRY
gstregistry.c:1685:scan_and_update_registry: Registry cache has not changed
0:00:00.048952699 27515      0x1586800 INFO            GST_REGISTRY
gstregistry.c:1762:ensure_current_registry: registry reading and updating done,
result = 1
0:00:00.048964067 27515      0x1586800 INFO                GST_INIT
gst.c:807:init_post: GLib runtime version: 2.54.3
0:00:00.048973419 27515      0x1586800 INFO                GST_INIT
gst.c:809:init_post: GLib headers version: 2.54.3
0:00:00.048984738 27515      0x1586800 INFO                GST_INIT
gst.c:810:init_post: initialized GStreamer successfully
0:00:00.049035232 27515      0x1586800 INFO            GST_PIPELINE
gstparse.c:337:gst_parse_launch_full: parsing pipeline description 'rtpbin
name=bin'
0:00:00.050520790 27515      0x1586800 INFO      GST_PLUGIN_LOADING
gstplugin.c:901:_priv_gst_plugin_load_file_for_registry: plugin
"/home/daniel/cerbero/build/dist/linux_x86_64/lib/gstreamer-1.0/libgstrtpmanager.so"
loaded
0:00:00.050544098 27515      0x1586800 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:361:gst_element_factory_create: creating element "rtpbin"
0:00:00.050944770 27515      0x1586800 INFO           GST_PARENTAGE
gstbin.c:4466:gst_bin_get_by_name: [bin]: looking up child element bin
**
ERROR:test2.c:13:main: 'bin' should not be NULL
Aborted (core dumped)

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