diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 41bd49eff5..499cff7cff 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -17,6 +17,7 @@ enum CodecID {
     CODEC_ID_MSMPEG4V1,
     CODEC_ID_MSMPEG4V2,
     CODEC_ID_MSMPEG4V3,
+    CODEC_ID_WMV1,
     CODEC_ID_H263P,
     CODEC_ID_H263I,
 
@@ -212,6 +213,7 @@ extern AVCodec mpeg4_decoder;
 extern AVCodec msmpeg4v1_decoder;
 extern AVCodec msmpeg4v2_decoder;
 extern AVCodec msmpeg4v3_decoder;
+extern AVCodec wmv1_decoder;
 extern AVCodec mpeg_decoder;
 extern AVCodec h263i_decoder;
 extern AVCodec rv10_decoder;
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index 50440d18a8..5a3d331865 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -62,6 +62,11 @@ static int h263_decode_init(AVCodecContext *avctx)
         s->h263_pred = 1;
         s->msmpeg4_version=3;
         break;
+    case CODEC_ID_WMV1:
+        s->h263_msmpeg4 = 1;
+        s->h263_pred = 1;
+        s->msmpeg4_version=4;
+        break;
     case CODEC_ID_H263I:
         s->h263_intel = 1;
         break;
@@ -234,7 +239,7 @@ static int h263_decode_frame(AVCodecContext *avctx,
         }
     }
     
-    if (s->h263_msmpeg4 && s->pict_type==I_TYPE)
+    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
         if(msmpeg4_decode_ext_header(s, buf_size) < 0) return -1;
 
     MPV_frame_end(s);
@@ -322,6 +327,18 @@ AVCodec msmpeg4v3_decoder = {
     CODEC_CAP_DRAW_HORIZ_BAND,
 };
 
+AVCodec wmv1_decoder = {
+    "wmv1",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_WMV1,
+    sizeof(MpegEncContext),
+    h263_decode_init,
+    NULL,
+    h263_decode_end,
+    h263_decode_frame,
+    CODEC_CAP_DRAW_HORIZ_BAND,
+};
+
 AVCodec h263i_decoder = {
     "h263i",
     CODEC_TYPE_VIDEO,
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 521e06f902..f35483e3a1 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -1652,7 +1652,7 @@ static void encode_picture(MpegEncContext *s, int picture_number)
     }
     emms_c();
 
-    if (s->h263_msmpeg4 && s->pict_type == I_TYPE)
+    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type == I_TYPE)
         msmpeg4_encode_ext_header(s);
 
     //if (s->gob_number)
diff --git a/libavcodec/msmpeg4.c b/libavcodec/msmpeg4.c
index 66fc5255e4..188e2302f6 100644
--- a/libavcodec/msmpeg4.c
+++ b/libavcodec/msmpeg4.c
@@ -802,8 +802,18 @@ static int decode012(GetBitContext *gb)
 
 int msmpeg4_decode_picture_header(MpegEncContext * s)
 {
-    int code;
+    int code, code2;
 
+#if 0
+{
+int i;
+for(i=0; i<s->gb.size*8; i++)
+    printf("%d", get_bits1(&s->gb));
+//    get_bits1(&s->gb);
+printf("END\n");
+return -1;
+}
+#endif
     s->pict_type = get_bits(&s->gb, 2) + 1;
     if (s->pict_type != I_TYPE &&
         s->pict_type != P_TYPE)
@@ -817,16 +827,34 @@ int msmpeg4_decode_picture_header(MpegEncContext * s)
         if (code < 0x17)
             return -1;
         s->slice_height = s->mb_height / (code - 0x16);
-        if(s->msmpeg4_version==2){
+
+        switch(s->msmpeg4_version){
+        case 2:
             s->rl_chroma_table_index = 2;
             s->rl_table_index = 2;
 
             s->dc_table_index = 0; //not used
-        }else{
+            break;
+        case 3:
             s->rl_chroma_table_index = decode012(&s->gb);
             s->rl_table_index = decode012(&s->gb);
 
             s->dc_table_index = get_bits1(&s->gb);
+            break;
+        case 4:
+            msmpeg4_decode_ext_header(s, 999 /* bufer size (useless here) */);
+            printf("%X\n", show_bits(&s->gb, 24));
+            code= get_bits(&s->gb, 2);
+            if(code==1){
+                code2= get_bits(&s->gb, 3);
+                if(code2==7) skip_bits(&s->gb, 1);
+            }
+            printf("%X\n", show_bits(&s->gb, 24));
+            s->rl_chroma_table_index = 2;
+            s->rl_table_index = 2;
+
+            s->dc_table_index = 0;
+            break;
         }
         s->no_rounding = 1;
 /*	printf(" %d %d %d %d     \n", 
@@ -864,6 +892,7 @@ int msmpeg4_decode_picture_header(MpegEncContext * s)
 	    s->no_rounding = 0;
 	}
 //	printf("%d", s->no_rounding);
+//return -1;
     }
     
 #if 0
@@ -1250,6 +1279,7 @@ static int msmpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
         i += run;
         if (i >= 64)
             return -1;
+//printf("RL:%d %d %d ", run, level, last);
 	j = scan_table[i];
         block[j] = level;
         i++;
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index c0f640591a..9a4abaa9ba 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -429,6 +429,7 @@ void avcodec_register_all(void)
     register_avcodec(&msmpeg4v1_decoder);
     register_avcodec(&msmpeg4v2_decoder);
     register_avcodec(&msmpeg4v3_decoder);
+    register_avcodec(&wmv1_decoder);
     register_avcodec(&mpeg_decoder);
     register_avcodec(&h263i_decoder);
     register_avcodec(&rv10_decoder);