diff --git a/configure.ac b/configure.ac
index bd7ad821fc..d6cc49b1f3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -71,6 +71,8 @@ AG_GST_GETTEXT([gst-plugins-ugly-$GST_MAJORMINOR])
 
 dnl *** check for arguments to configure ***
 
+AG_GST_ARG_DISABLE_FATAL_WARNINGS
+
 AG_GST_ARG_DEBUG
 AG_GST_ARG_PROFILING
 AG_GST_ARG_VALGRIND
@@ -189,14 +191,14 @@ AG_GST_SET_PACKAGE_RELEASE_DATETIME_WITH_NANO([$PACKAGE_VERSION_NANO],
   [$PACKAGE_VERSION_MAJOR.$PACKAGE_VERSION_MINOR.$PACKAGE_VERSION_MICRO])
 
 dnl define an ERROR_CFLAGS Makefile variable
-AG_GST_SET_ERROR_CFLAGS($GST_GIT, [
+AG_GST_SET_ERROR_CFLAGS($FATAL_WARNINGS, [
     -Wmissing-declarations -Wmissing-prototypes -Wredundant-decls
     -Wwrite-strings -Wformat-nonliteral -Wformat-security -Wold-style-definition
     -Winit-self -Wmissing-include-dirs -Waddress
     -Waggregate-return -Wno-multichar -Wnested-externs ])
 
 dnl define an ERROR_CXXFLAGS Makefile variable
-AG_GST_SET_ERROR_CXXFLAGS($GST_GIT, [
+AG_GST_SET_ERROR_CXXFLAGS($FATAL_WARNINGS, [
     -Wmissing-declarations -Wredundant-decls
     -Wwrite-strings -Wformat-nonliteral -Wformat-security
     -Winit-self -Wmissing-include-dirs -Waddress -Waggregate-return
diff --git a/ext/a52dec/gsta52dec.c b/ext/a52dec/gsta52dec.c
index 370d11e625..161cf5c76f 100644
--- a/ext/a52dec/gsta52dec.c
+++ b/ext/a52dec/gsta52dec.c
@@ -308,7 +308,7 @@ gst_a52dec_parse (GstAudioDecoder * bdec, GstAdapter * adapter,
   bit_rate = a52dec->bit_rate;
   sample_rate = a52dec->sample_rate;
   flags = 0;
-  while (av >= 7) {
+  while (size >= 7) {
     length = a52_syncinfo ((guint8 *) data, &flags, &sample_rate, &bit_rate);
 
     if (length == 0) {
diff --git a/ext/amrnb/amrnbdec.c b/ext/amrnb/amrnbdec.c
index a3fe067df2..0b9a09cbe4 100644
--- a/ext/amrnb/amrnbdec.c
+++ b/ext/amrnb/amrnbdec.c
@@ -249,7 +249,7 @@ gst_amrnbdec_parse (GstAudioDecoder * dec, GstAdapter * adapter,
   gst_audio_decoder_get_parse_state (dec, &sync, &eos);
 
   /* need to peek data to get the size */
-  if (gst_adapter_available (adapter) < 1)
+  if (size < 1)
     return GST_FLOW_ERROR;
 
   gst_adapter_copy (adapter, head, 0, 1);
@@ -272,6 +272,9 @@ gst_amrnbdec_parse (GstAudioDecoder * dec, GstAdapter * adapter,
 
   GST_DEBUG_OBJECT (amrnbdec, "mode %d, block %d", mode, block);
 
+  if (block > size)
+    return GST_FLOW_UNEXPECTED;
+
   *offset = 0;
   *length = block;
 
diff --git a/ext/amrwbdec/amrwbdec.c b/ext/amrwbdec/amrwbdec.c
index 6286efcf1a..5a6e73ae96 100644
--- a/ext/amrwbdec/amrwbdec.c
+++ b/ext/amrwbdec/amrwbdec.c
@@ -178,7 +178,7 @@ gst_amrwbdec_parse (GstAudioDecoder * dec, GstAdapter * adapter,
   gst_audio_decoder_get_parse_state (dec, &sync, &eos);
 
   /* need to peek data to get the size */
-  if (gst_adapter_available (adapter) < 1)
+  if (size < 1)
     return GST_FLOW_ERROR;
 
   gst_adapter_copy (adapter, header, 0, 1);
@@ -188,6 +188,8 @@ gst_amrwbdec_parse (GstAudioDecoder * dec, GstAdapter * adapter,
   GST_DEBUG_OBJECT (amrwbdec, "mode %d, block %d", mode, block);
 
   if (block) {
+    if (block > size)
+      return GST_FLOW_UNEXPECTED;
     *offset = 0;
     *length = block;
   } else {
diff --git a/ext/dvdread/dvdreadsrc.c b/ext/dvdread/dvdreadsrc.c
index 87f94beeb7..53e0aa3292 100644
--- a/ext/dvdread/dvdreadsrc.c
+++ b/ext/dvdread/dvdreadsrc.c
@@ -327,11 +327,14 @@ cur_title_get_chapter_bounds (GstDvdReadSrc * src, gint chapter,
   *p_first_cell = pgc->program_map[pgn - 1] - 1;
 
   if (chapter == (src->num_chapters - 1)) {
-    *p_last_cell = pgc->nr_of_cells;
+    *p_last_cell = pgc->nr_of_cells - 1;
   } else {
     pgn_next_ch = src->vts_ptt_srpt->title[src->ttn - 1].ptt[chapter + 1].pgn;
     *p_last_cell = pgc->program_map[pgn_next_ch - 1] - 1;
   }
+
+  GST_DEBUG_OBJECT (src, "Chapter %d bounds: %d %d (within %d cells)",
+      chapter, *p_first_cell, *p_last_cell, pgc->nr_of_cells);
 }
 
 static gboolean
diff --git a/ext/x264/gstx264enc.c b/ext/x264/gstx264enc.c
index 3fcce51a98..12c1523ad9 100644
--- a/ext/x264/gstx264enc.c
+++ b/ext/x264/gstx264enc.c
@@ -431,7 +431,7 @@ gst_x264_enc_build_tunings_string (GstX264Enc * x264enc)
 {
   int i = 1;
 
-  if (x264enc->tunings && x264enc->tunings->len)
+  if (x264enc->tunings)
     g_string_free (x264enc->tunings, TRUE);
 
   if (x264enc->psy_tune) {
@@ -948,7 +948,7 @@ gst_x264_enc_finalize (GObject * object)
 
 #define FREE_STRING(ptr) \
   if (ptr) \
-    ptr = (GString *)g_string_free (ptr, TRUE);
+    g_string_free (ptr, TRUE);
 
   FREE_STRING (encoder->tunings);
   FREE_STRING (encoder->option_string);