diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index b202dcb09287ca4b8778eaa4175a29274d4e9028..4e190690f9fd9f856af93a313ecd8ec2a4db75ef 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -64,6 +64,7 @@ void avcodec_register_all(void)
     register_avcodec(&h263p_encoder);
     register_avcodec(&flv_encoder);
     register_avcodec(&rv10_encoder);
+    register_avcodec(&rv20_encoder);
     register_avcodec(&mpeg4_encoder);
     register_avcodec(&msmpeg4v1_encoder);
     register_avcodec(&msmpeg4v2_encoder);
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 9eeaee812db05ebf06999ff85d08e81d08d2dc81..c733d80dbbc17c88ad6ae89d90e8ffb66f63ecc9 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -1120,6 +1120,16 @@ int MPV_encode_init(AVCodecContext *avctx)
         avctx->delay=0;
         s->low_delay=1;
         break;
+    case CODEC_ID_RV20:
+        s->out_format = FMT_H263;
+        avctx->delay=0;
+        s->low_delay=1;
+        s->modified_quant=1;
+        s->h263_aic=1;
+        s->h263_plus=1;
+        s->loop_filter=1;
+        s->unrestricted_mv= s->obmc || s->loop_filter || s->umvplus;
+        break;
     case CODEC_ID_MPEG4:
         s->out_format = FMT_H263;
         s->h263_pred = 1;
@@ -4150,6 +4160,7 @@ static void encode_mb(MpegEncContext *s, int motion_x, int motion_y)
     case CODEC_ID_H263P:
     case CODEC_ID_FLV1:
     case CODEC_ID_RV10:
+    case CODEC_ID_RV20:
         h263_encode_mb(s, s->block, motion_x, motion_y); break;
 #endif
     case CODEC_ID_MJPEG:
@@ -4175,6 +4186,8 @@ void ff_mpeg_flush(AVCodecContext *avctx){
     }
     s->current_picture_ptr = s->last_picture_ptr = s->next_picture_ptr = NULL;
     
+    s->mb_x= s->mb_y= 0;
+    
     s->parse_context.state= -1;
     s->parse_context.frame_start_found= 0;
     s->parse_context.overread= 0;
@@ -5255,6 +5268,8 @@ static void encode_picture(MpegEncContext *s, int picture_number)
             mpeg4_encode_picture_header(s, picture_number);
         else if (s->codec_id == CODEC_ID_RV10) 
             rv10_encode_picture_header(s, picture_number);
+        else if (s->codec_id == CODEC_ID_RV20) 
+            rv20_encode_picture_header(s, picture_number);
         else if (s->codec_id == CODEC_ID_FLV1)
             ff_flv_encode_picture_header(s, picture_number);
         else
@@ -6379,6 +6394,16 @@ AVCodec rv10_encoder = {
     MPV_encode_end,
 };
 
+AVCodec rv20_encoder = {
+    "rv20",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_RV20,
+    sizeof(MpegEncContext),
+    MPV_encode_init,
+    MPV_encode_picture,
+    MPV_encode_end,
+};
+
 AVCodec mpeg4_encoder = {
     "mpeg4",
     CODEC_TYPE_VIDEO,
diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index fc44781cc9edff2181a4aae4c37f7bf14466f5b1..0aeb07a198313a4cc6945009378852376785c60b 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -932,6 +932,7 @@ int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size);
 /* rv10.c */
 void rv10_encode_picture_header(MpegEncContext *s, int picture_number);
 int rv_decode_dc(MpegEncContext *s, int n);
+void rv20_encode_picture_header(MpegEncContext *s, int picture_number);
 
 
 /* msmpeg4.c */
diff --git a/libavcodec/rv10.c b/libavcodec/rv10.c
index c544438dded9d8e8211c2aa5c60ad631fc5482d2..6b332e4a19dccc69581be5c767344b4a5571d436 100644
--- a/libavcodec/rv10.c
+++ b/libavcodec/rv10.c
@@ -258,6 +258,35 @@ void rv10_encode_picture_header(MpegEncContext *s, int picture_number)
     put_bits(&s->pb, 3, 0);	/* ignored */
 }
 
+void rv20_encode_picture_header(MpegEncContext *s, int picture_number){
+    put_bits(&s->pb, 2, s->pict_type); //I 0 vs. 1 ?
+    put_bits(&s->pb, 1, 0);	/* unknown bit */
+    put_bits(&s->pb, 5, s->qscale);
+        
+    put_bits(&s->pb, 8, picture_number&0xFF); //FIXME wrong, but correct is not known
+    s->mb_x= s->mb_y= 0;
+    ff_h263_encode_mba(s);
+    
+    put_bits(&s->pb, 1, s->no_rounding);
+    
+    assert(s->f_code == 1);
+    assert(s->unrestricted_mv == 1);
+//    assert(s->h263_aic== (s->pict_type == I_TYPE));
+    assert(s->alt_inter_vlc == 0);
+    assert(s->umvplus == 0);
+    assert(s->modified_quant==1);
+    assert(s->loop_filter==1);
+
+    s->h263_aic= s->pict_type == I_TYPE;
+    if(s->h263_aic){
+        s->y_dc_scale_table= 
+        s->c_dc_scale_table= ff_aic_dc_scale_table;
+    }else{
+        s->y_dc_scale_table=
+        s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
+    }
+}
+
 static int get_num(GetBitContext *gb)
 {
     int n, n1;
diff --git a/libavformat/rm.c b/libavformat/rm.c
index d0be6400f18a0b35b5a313e6504c7bd4683d24ea..f08a65821978403c73c418f101dd45d3f527427e 100644
--- a/libavformat/rm.c
+++ b/libavformat/rm.c
@@ -230,7 +230,10 @@ static void rv10_write_header(AVFormatContext *ctx,
         } else {
             /* video codec info */
             put_be32(s,34); /* size */
-            put_tag(s,"VIDORV10");
+            if(stream->enc->codec_id == CODEC_ID_RV10)
+                put_tag(s,"VIDORV10");
+            else
+                put_tag(s,"VIDORV20");
             put_be16(s, stream->enc->width);
             put_be16(s, stream->enc->height);
             put_be16(s, (int) stream->frame_rate); /* frames per seconds ? */
@@ -241,7 +244,10 @@ static void rv10_write_header(AVFormatContext *ctx,
             /* Seems to be the codec version: only use basic H263. The next
                versions seems to add a diffential DC coding as in
                MPEG... nothing new under the sun */
-            put_be32(s,0x10000000); 
+            if(stream->enc->codec_id == CODEC_ID_RV10)
+                put_be32(s,0x10000000); 
+            else
+                put_be32(s,0x20103001); 
             //put_be32(s,0x10003000); 
         }
     }