diff --git a/configure b/configure
index 8651e2272e..8c1190f0ae 100755
--- a/configure
+++ b/configure
@@ -2660,6 +2660,8 @@ msvc_flags(){
             -fno-common)          ;;
             -fno-signed-zeros)    ;;
             -fPIC)                ;;
+            -mthumb)              ;;
+            -march=*)             ;;
             -lz)                  echo zlib.lib ;;
             -lavifil32)           echo vfw32.lib ;;
             -lavicap32)           echo vfw32.lib user32.lib ;;
diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index b5ef9663a3..c6861519de 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -2121,7 +2121,7 @@ static int decode_chunks(AVCodecContext *avctx,
     const uint8_t *buf_ptr = buf;
     const uint8_t *buf_end = buf + buf_size;
     int ret, input_size;
-    int last_code = 0;
+    int last_code = 0, skip_frame = 0;
     int picture_start_code_seen = 0;
 
     for (;;) {
@@ -2129,7 +2129,7 @@ static int decode_chunks(AVCodecContext *avctx,
         uint32_t start_code = -1;
         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
         if (start_code > 0x1ff) {
-            if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
+            if (!skip_frame) {
                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
                     int i;
                     av_assert0(avctx->thread_count > 1);
@@ -2316,20 +2316,27 @@ static int decode_chunks(AVCodecContext *avctx,
                 if (s2->last_picture_ptr == NULL) {
                 /* Skip B-frames if we do not have reference frames and gop is not closed */
                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
-                        if (!s2->closed_gop)
+                        if (!s2->closed_gop) {
+                            skip_frame = 1;
                             break;
+                        }
                     }
                 }
                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
                     s->sync=1;
                 if (s2->next_picture_ptr == NULL) {
                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
-                    if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
+                    if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
+                        skip_frame = 1;
+                        break;
+                    }
                 }
                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
-                     avctx->skip_frame >= AVDISCARD_ALL)
+                     avctx->skip_frame >= AVDISCARD_ALL) {
+                    skip_frame = 1;
                     break;
+                }
 
                 if (!s->mpeg_enc_ctx_allocated)
                     break;
@@ -2347,6 +2354,7 @@ static int decode_chunks(AVCodecContext *avctx,
                 }
 
                 if (s2->first_slice) {
+                    skip_frame = 0;
                     s2->first_slice = 0;
                     if (mpeg_field_start(s2, buf, buf_size) < 0)
                         return -1;