getting assertion `GST_IS_PAD (pad)' failed on calling gst_element_remove_pad

[Yogesh Tyagi]

Hi,

I am getting following error when I am trying to play a media file with my
sample gstreamer player:


(im_gst_play:3723): GLib-GObject-WARNING **: invalid uninstantiatable type
`(null)' in cast to `GstPad'

(im_gst_play:3723): GStreamer-CRITICAL **: gst_element_remove_pad:
assertion `GST_IS_PAD (pad)' failed


I found that error was getting generated from "gst_element_remove_pad"
function call:

In my demux element I am using "gst_element_remove_pad" in following way in
finalize method of demux element:

 im_gst_element_unregister_sinkpad (im_element, im_element->sink_pad);

 if (!gst_element_remove_pad(GST_ELEMENT_CAST(demux),
GST_PAD(im_element->sink_pad)))
  {
    GST_ERROR_OBJECT (demux, "Error removing pad");
  }

implementation of function "im_gst_element_unregister_sinkpad " is given
below:

 gboolean im_gst_element_unregister_sinkpad (ImGstElement * im_element,
ImGstPad * pad)
{
  ImGstElementSinkPad *pad_node_data = NULL;
  g_mutex_lock (im_element->pad_list_mutex);
  pad_node_data = im_gst_element_get_sink_pad_nodedata(im_element, pad);
  g_static_rec_mutex_free (pad_node_data->adapter_lock);
  g_free (pad_node_data->adapter_lock);
  pad_node_data->adapter_lock = NULL;
  gst_adapter_clear(pad_node_data->adapter);
  g_object_unref(pad_node_data->adapter);
  pad_node_data->adapter = NULL;

  im_element->sink_pads = g_list_remove (im_element->sink_pads,
(gconstpointer) pad_node_data);
  g_free(pad_node_data);
  g_mutex_unlock (im_element->pad_list_mutex);
  return TRUE;
}

 Can somebody help me to find out why this assertion is getting generated?

Thanks,
Yogesh
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