tagmux: Reset final tags for reusing element

If the output tag had been exposed, it never ever updated
even if we reset the tagmux using state change.

https://bugzilla.gnome.org/show_bug.cgi?id=795691

diff --git a/gst-libs/gst/tag/gsttagmux.c b/gst-libs/gst/tag/gsttagmux.c
index df0ac8b4fb8485d6fb6f9dfafe66b346d5dc68cb..f9aa0240f77cb905d2282d6c0bcf9896249e522d 100644 (file)
--- a/gst-libs/gst/tag/gsttagmux.c
+++ b/gst-libs/gst/tag/gsttagmux.c
@@ -537,6 +537,10 @@ gst_tag_mux_change_state (GstElement * element, GstStateChange transition)
         gst_tag_list_unref (mux->priv->event_tags);
         mux->priv->event_tags = NULL;
       }
+      if (mux->priv->final_tags) {
+        gst_tag_list_unref (mux->priv->final_tags);
+        mux->priv->final_tags = NULL;
+      }
       mux->priv->start_tag_size = 0;
       mux->priv->end_tag_size = 0;
       mux->priv->render_start_tag = TRUE;