Currently, when nlecomposition object is finalized with pending elements to be added in bin (in action or in pending_io), these elements are not unreffed and so they are leaked since from user point of view references are given during gst_bin_add.

This can easily happen if the state of the nlecomposition element is in NULL state: action processing task is not running; or if changes have not been committed.

Below is two snippets of code used to check leaks with GST_TRACE

/* test case with pending actions */
GstElement *bin = gst_element_factory_make ("nlecomposition", NULL);
GstElement *operation = gst_element_factory_make ("nleoperation", NULL);
gst_bin_add (GST_BIN (bin), operation);
gst_object_unref (bin);

/* test case with pending io, ie not committed */
GstElement *bin = gst_element_factory_make ("nlecomposition", NULL);
GstElement *operation = gst_element_factory_make ("nleoperation", NULL);
gst_bin_add (GST_BIN (bin), operation);
gst_element_set_state (bin, GST_STATE_READY);
g_usleep (1 * G_USEC_PER_SEC);
gst_element_set_state (bin, GST_STATE_NULL);
gst_object_unref (bin);