diff --git a/libs/gst/base/gstbaseparse.c b/libs/gst/base/gstbaseparse.c
index eee3c92..d49aad6 100644
--- a/libs/gst/base/gstbaseparse.c
+++ b/libs/gst/base/gstbaseparse.c
@@ -2813,6 +2813,7 @@ gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
   GstBuffer *tmpbuf = NULL;
   guint fsize = 1;
   gint skip = -1;
+  const guint8 *data;
   guint min_size, av;
   GstClockTime pts, dts;
 
@@ -3012,7 +3011,11 @@ gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
       parse->priv->next_dts = pts;
 
     /* always pass all available data */
+    data = gst_adapter_map (parse->priv->adapter, av);
+    /* arrange for actual data to be copied if subclass tries to,
+     * since what is passed is tied to the adapter */
+    tmpbuf = gst_buffer_new_wrapped_full (GST_MEMORY_FLAG_READONLY |
+        GST_MEMORY_FLAG_NO_SHARE, (gpointer) data, av, 0, av, NULL, NULL);
-    tmpbuf = gst_adapter_get_buffer (parse->priv->adapter, av);
 
     /* already inform subclass what timestamps we have planned,
      * at least if provided by time-based upstream */
@@ -3029,6 +3024,9 @@ gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
     ret = gst_base_parse_handle_buffer (parse, tmpbuf, &skip, &flush);
     tmpbuf = NULL;
 
+    /* probably already implicitly unmapped due to adapter operation,
+     * but for good measure ... */
+    gst_adapter_unmap (parse->priv->adapter);
     if (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED) {
       goto done;
     }