[Bug 788025] vaapih264enc leaks 1-4 frames of memory

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788025

--- Comment #14 from Harvey <hchapman-gnomebugzilla at 3gfp.com> ---
We've installed a work-around:

```
static void unrefVaapiDisplayContext(PrivateData *priv) {
    GST_OBJECT_LOCK (priv->pipeline);
    GstElement* element = GST_ELEMENT_CAST(priv->pipeline);
    GList *l;
    for (l = element->contexts; l;) {
      GstContext *context = (GstContext*)l->data;

      if (!gst_context_is_persistent (context)) {
        if(g_strcmp0(gst_context_get_context_type(context),
"gst.vaapi.Display") == 0) {
            GList *next;
            gst_context_unref (context);
            next = l->next;
            element->contexts = g_list_delete_link (element->contexts, l);
            l = next;
        } else {
            l = l->next;
        }
      } else {
        l = l->next;
      }
    }
    GST_OBJECT_UNLOCK (priv->pipeline);
}```

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