--- a/gst-libs/gst/riff/riff-media.c
+++ b/gst-libs/gst/riff/riff-media.c
@@ -497,6 +497,10 @@
       caps = gst_caps_new_simple ("video/mpeg",
           "mpegversion", G_TYPE_INT, 4,
           "systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
+      {gchar *fstr = g_strdup_printf ("%" GST_FOURCC_FORMAT,
+          GST_FOURCC_ARGS (codec_fcc));
+      gst_caps_set_simple (caps, "fourcc", G_TYPE_STRING, fstr, NULL);
+      g_free (fstr);}
       if (codec_name)
         *codec_name = g_strdup ("MPEG-4");
       break;