--- a/configure.in
+++ b/configure.in
@@ -5715,19 +5715,17 @@ MOZ_ARG_ENABLE_BOOL(gstreamer,
 [  --enable-gstreamer           Enable GStreamer support],
 MOZ_GSTREAMER=1,
 MOZ_GSTREAMER=)
 
 if test "$MOZ_GSTREAMER"; then
     # API version, eg 0.10, 1.0 etc
     GST_API_VERSION=0.10
     # core/base release number
-    # depend on >= 0.10.33 as that's when the playbin2 source-setup signal was
-    # introduced
-    GST_VERSION=0.10.33
+    GST_VERSION=0.10.25
     PKG_CHECK_MODULES(GSTREAMER,
                       gstreamer-$GST_API_VERSION >= $GST_VERSION
                       gstreamer-app-$GST_API_VERSION
                       gstreamer-plugins-base-$GST_API_VERSION)
     if test -n "$GSTREAMER_LIBS"; then
        _SAVE_LDFLAGS=$LDFLAGS
        LDFLAGS="$LDFLAGS $GSTREAMER_LIBS -lgstvideo-$GST_API_VERSION"
        AC_TRY_LINK(,[return 0;],_HAVE_LIBGSTVIDEO=1,_HAVE_LIBGSTVIDEO=)

--- a/content/media/gstreamer/GStreamerReader.cpp
+++ b/content/media/gstreamer/GStreamerReader.cpp
@@ -83,16 +83,18 @@ GStreamerReader::GStreamerReader(Abstrac
 
 GStreamerReader::~GStreamerReader()
 {
   MOZ_COUNT_DTOR(GStreamerReader);
   ResetDecode();
 
   if (mPlayBin) {
     gst_app_src_end_of_stream(mSource);
+    if (mSource)
+      gst_object_unref(mSource);
     gst_element_set_state(mPlayBin, GST_STATE_NULL);
     gst_object_unref(mPlayBin);
     mPlayBin = NULL;
     mVideoSink = NULL;
     mVideoAppSink = NULL;
     mAudioSink = NULL;
     mAudioAppSink = NULL;
     gst_object_unref(mBus);
@@ -155,28 +157,31 @@ nsresult GStreamerReader::Init(MediaDeco
       G_CALLBACK(&GStreamerReader::EventProbeCb), this);
   gst_object_unref(sinkpad);
 
   g_object_set(mPlayBin, "uri", "appsrc://",
       "video-sink", mVideoSink,
       "audio-sink", mAudioSink,
       NULL);
 
-  g_object_connect(mPlayBin, "signal::source-setup",
-      GStreamerReader::PlayBinSourceSetupCb, this, NULL);
+  g_signal_connect(G_OBJECT(mPlayBin), "notify::source",
+    G_CALLBACK(GStreamerReader::PlayBinSourceSetupCb), this);
 
   return NS_OK;
 }
 
 void GStreamerReader::PlayBinSourceSetupCb(GstElement *aPlayBin,
-                                             GstElement *aSource,
+                                             GParamSpec *pspec,
                                              gpointer aUserData)
 {
+  GstElement *source;
   GStreamerReader *reader = reinterpret_cast<GStreamerReader*>(aUserData);
-  reader->PlayBinSourceSetup(GST_APP_SRC(aSource));
+
+  g_object_get(aPlayBin, "source", &source, NULL);
+  reader->PlayBinSourceSetup(GST_APP_SRC(source));
 }
 
 void GStreamerReader::PlayBinSourceSetup(GstAppSrc *aSource)
 {
   mSource = GST_APP_SRC(aSource);
   gst_app_src_set_callbacks(mSource, &mSrcCallbacks, (gpointer) this, NULL);
   MediaResource* resource = mDecoder->GetResource();
   int64_t len = resource->GetLength();

--- a/content/media/gstreamer/GStreamerReader.h
+++ b/content/media/gstreamer/GStreamerReader.h
@@ -52,17 +52,17 @@ private:
   int64_t QueryDuration();
 
   /* Gst callbacks */
 
   /* Called on the source-setup signal emitted by playbin. Used to
    * configure appsrc .
    */
   static void PlayBinSourceSetupCb(GstElement *aPlayBin,
-                                   GstElement *aSource,
+                                   GParamSpec *pspec,
                                    gpointer aUserData);
   void PlayBinSourceSetup(GstAppSrc *aSource);
 
   /* Called from appsrc when we need to read more data from the resource */
   static void NeedDataCb(GstAppSrc *aSrc, guint aLength, gpointer aUserData);
   void NeedData(GstAppSrc *aSrc, guint aLength);
 
   /* Called when appsrc has enough data and we can stop reading */