I am developing a muxer plugin,where I use the request_new_pad/release_pad from GstElementClass.  But i never saw the release_pad callback function was called in my codes thought I did see the finalize(GObjectClass) was called in the end. I am not quite sure why release_pad was no called. Will it cause the memory leakage ?   The following are the request_new_pad and finalize functions.   Regards,   Yihe /****************************************************************** * gst_tidmaireiszer_request_new_pad *    request a new pad ******************************************************************/ static GstPad *gst_tidmairesizer_request_new_pad(GstElement * element,  GstPadTemplate *templ,const gchar *req_name) { GstTIDmaiResizer *dmairesizer; GstPad *newpad; GstElementClass *klass = GST_ELEMENT_GET_CLASS(element); gchar *name;  if(templ != gst_element_class_get_pad_template(klass,"decimage_%d"))  goto wrong_template;  dmairesizer = GST_TIDMAIRESIZER(element);   //create new pad  name = g_strdup_printf("decimage_%02d",dmairesizer->numpads);  newpad = gst_pad_new_from_template(templ,name);  g_free(name);  GstResizerPad *resizerpad;  if(dmairesizer->numpads >= MAX_INPUT_SUPPORT)  {   GST_ERROR("Over the max input hardware can support\n");   gst_object_unref(newpad);   return NULL;  }  resizerpad = (GstResizerPad *) gst_collect_pads_add_pad(dmairesizer->collect,newpad,sizeof(GstResizerPad));  resizerpad->x_start = dmairesizer->x_start[dmairesizer->numpads];  resizerpad->y_start = dmairesizer->y_start[dmairesizer->numpads];   resizerpad->rsFormat = dmairesizer->rsFormat[dmairesizer->numpads];  //save a pointer to our data in the pad // gst_pad_set_element_private(newpad,resizerpad);    dmairesizer->numpads++;    GST_LOG("request new pad %d\n",dmairesizer->numpads);  //set sink pad caps  gst_pad_set_setcaps_function (newpad,GST_DEBUG_FUNCPTR (gst_tidmairesizer_set_sink_caps));  //add pad to element  gst_element_add_pad(element,newpad);  return newpad; wrong_template:  {   GST_ERROR("this is not our template pad!\n");   return NULL;  } }       static void gst_tidmairesizer_finalize(GObject *object) { GstTIDmaiResizer *dmairesizer = GST_TIDMAIRESIZER(object);  GST_LOG("finalizer being\n");  //clean up everything  gst_tidmairesizer_exit_video(dmairesizer);  GST_LOG("finalizer begin\n");  if(dmairesizer->collect)  {   gst_object_unref(dmairesizer->collect);   dmairesizer->collect=NULL;  }  G_OBJECT_CLASS(parent_class)->finalize(object);  GST_LOG("finalizer Finish\n"); }