diff --git a/configure b/configure
index 5809fb9303..1a5790f584 100755
--- a/configure
+++ b/configure
@@ -3367,6 +3367,8 @@ case $target_os in
         elif enabled arm; then
             LIBTARGET=arm-wince
         fi
+        check_ldflags -Wl,--nxcompat
+        check_ldflags -Wl,--dynamicbase
         shlibdir_default="$bindir_default"
         SLIBPREF=""
         SLIBSUF=".dll"
diff --git a/libavcodec/mss2.c b/libavcodec/mss2.c
index fcdbbd2562..54b9fb5f80 100644
--- a/libavcodec/mss2.c
+++ b/libavcodec/mss2.c
@@ -388,7 +388,7 @@ static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size,
 
     s->loop_filter = avctx->skip_loop_filter < AVDISCARD_ALL;
 
-    if (ff_vc1_parse_frame_header(v, &s->gb) == -1) {
+    if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {
         av_log(v->s.avctx, AV_LOG_ERROR, "header error\n");
         return AVERROR_INVALIDDATA;
     }
diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c
index f039d722e7..818e8d3c0d 100644
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@@ -873,7 +873,7 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
         fcm = PROGRESSIVE;
     }
     if (!v->first_pic_header_flag && v->field_mode != field_mode)
-        return -1;
+        return AVERROR_INVALIDDATA;
     v->field_mode = field_mode;
     v->fcm = fcm;
 
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index 3fbbeaefb0..4cdf470969 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -85,7 +85,6 @@ static void init_block_index(VC1Context *v)
     }
 }
 
-
 /** @} */ //Bitplane group
 
 static void vc1_put_signed_blocks_clamped(VC1Context *v)
@@ -348,7 +347,6 @@ static void vc1_mc_1mv(VC1Context *v, int dir)
     H264ChromaContext *h264chroma = &v->h264chroma;
     uint8_t *srcY, *srcU, *srcV;
     int dxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;
-    int off, off_uv;
     int v_edge_pos = s->v_edge_pos >> v->field_mode;
     int i;
     uint8_t (*luty)[256], (*lutuv)[256];
@@ -514,21 +512,19 @@ static void vc1_mc_1mv(VC1Context *v, int dir)
         srcY += s->mspel * (1 + s->linesize);
     }
 
-        off    = 0;
-        off_uv = 0;
     if (s->mspel) {
         dxy = ((my & 3) << 2) | (mx & 3);
-        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off    , srcY    , s->linesize, v->rnd);
-        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8, srcY + 8, s->linesize, v->rnd);
+        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0]    , srcY    , s->linesize, v->rnd);
+        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8, srcY + 8, s->linesize, v->rnd);
         srcY += s->linesize * 8;
-        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize    , srcY    , s->linesize, v->rnd);
-        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);
+        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8 * s->linesize    , srcY    , s->linesize, v->rnd);
+        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);
     } else { // hpel mc - always used for luma
         dxy = (my & 2) | ((mx & 2) >> 1);
         if (!v->rnd)
-            s->hdsp.put_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);
+            s->hdsp.put_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);
         else
-            s->hdsp.put_no_rnd_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);
+            s->hdsp.put_no_rnd_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);
     }
 
     if (s->flags & CODEC_FLAG_GRAY) return;
@@ -536,11 +532,11 @@ static void vc1_mc_1mv(VC1Context *v, int dir)
     uvmx = (uvmx & 3) << 1;
     uvmy = (uvmy & 3) << 1;
     if (!v->rnd) {
-        h264chroma->put_h264_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);
-        h264chroma->put_h264_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);
+        h264chroma->put_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
+        h264chroma->put_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);
     } else {
-        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);
-        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);
+        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
+        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);
     }
 }
 
@@ -809,7 +805,7 @@ static void vc1_mc_4mv_chroma(VC1Context *v, int dir)
     int k, tx = 0, ty = 0;
     int mvx[4], mvy[4], intra[4], mv_f[4];
     int valid_count;
-    int chroma_ref_type = v->cur_field_type, off = 0;
+    int chroma_ref_type = v->cur_field_type;
     int v_edge_pos = s->v_edge_pos >> v->field_mode;
     uint8_t (*lutuv)[256];
     int use_ic;
@@ -904,7 +900,6 @@ static void vc1_mc_4mv_chroma(VC1Context *v, int dir)
             srcU += s->current_picture_ptr->f.linesize[1];
             srcV += s->current_picture_ptr->f.linesize[2];
         }
-        off = 0;
     }
 
     if (v->rangeredfrm || use_ic
@@ -959,11 +954,11 @@ static void vc1_mc_4mv_chroma(VC1Context *v, int dir)
     uvmx = (uvmx & 3) << 1;
     uvmy = (uvmy & 3) << 1;
     if (!v->rnd) {
-        h264chroma->put_h264_chroma_pixels_tab[0](s->dest[1] + off, srcU, s->uvlinesize, 8, uvmx, uvmy);
-        h264chroma->put_h264_chroma_pixels_tab[0](s->dest[2] + off, srcV, s->uvlinesize, 8, uvmx, uvmy);
+        h264chroma->put_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
+        h264chroma->put_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);
     } else {
-        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off, srcU, s->uvlinesize, 8, uvmx, uvmy);
-        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off, srcV, s->uvlinesize, 8, uvmx, uvmy);
+        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
+        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);
     }
 }
 
@@ -2023,8 +2018,8 @@ static void vc1_interp_mc(VC1Context *v)
         srcY += s->mspel * (1 + s->linesize);
     }
 
-        off    = 0;
-        off_uv = 0;
+    off    = 0;
+    off_uv = 0;
 
     if (s->mspel) {
         dxy = ((my & 3) << 2) | (mx & 3);