diff --git a/libavformat/flv.h b/libavformat/flv.h
index d0731c80a3..bca17fc643 100644
--- a/libavformat/flv.h
+++ b/libavformat/flv.h
@@ -98,6 +98,8 @@ enum {
     FLV_CODECID_VP6A    = 5,
     FLV_CODECID_SCREEN2 = 6,
     FLV_CODECID_H264    = 7,
+    FLV_CODECID_REALH263= 8,
+    FLV_CODECID_MPEG4   = 9,
 };
 
 enum {
diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index d3e3d77fce..e861941cf0 100644
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -91,6 +91,7 @@ static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_co
     AVCodecContext *vcodec = vstream->codec;
     switch(flv_codecid) {
         case FLV_CODECID_H263  : vcodec->codec_id = CODEC_ID_FLV1   ; break;
+        case FLV_CODECID_REALH263: vcodec->codec_id = CODEC_ID_H263 ; break; // Really mean it this time
         case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
         case FLV_CODECID_SCREEN2: vcodec->codec_id = CODEC_ID_FLASHSV2; break;
         case FLV_CODECID_VP6   : vcodec->codec_id = CODEC_ID_VP6F   ;
@@ -106,6 +107,9 @@ static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_co
         case FLV_CODECID_H264:
             vcodec->codec_id = CODEC_ID_H264;
             return 3; // not 4, reading packet type will consume one byte
+        case FLV_CODECID_MPEG4:
+            vcodec->codec_id = CODEC_ID_MPEG4;
+            return 3;
         default:
             av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
             vcodec->codec_tag = flv_codecid;
@@ -467,10 +471,11 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
     }
 
     if (st->codec->codec_id == CODEC_ID_AAC ||
-        st->codec->codec_id == CODEC_ID_H264) {
+        st->codec->codec_id == CODEC_ID_H264 ||
+        st->codec->codec_id == CODEC_ID_MPEG4) {
         int type = avio_r8(s->pb);
         size--;
-        if (st->codec->codec_id == CODEC_ID_H264) {
+        if (st->codec->codec_id == CODEC_ID_H264 || st->codec->codec_id == CODEC_ID_MPEG4) {
             int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension
             pts = dts + cts;
             if (cts < 0) { // dts are wrong
diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
index 5bf9809358..d790a12288 100644
--- a/libavformat/flvenc.c
+++ b/libavformat/flvenc.c
@@ -33,6 +33,8 @@
 
 static const AVCodecTag flv_video_codec_ids[] = {
     {CODEC_ID_FLV1,    FLV_CODECID_H263  },
+    {CODEC_ID_H263,    FLV_CODECID_REALH263},
+    {CODEC_ID_MPEG4,   FLV_CODECID_MPEG4 },
     {CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
     {CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2},
     {CODEC_ID_VP6F,    FLV_CODECID_VP6   },
@@ -300,7 +302,7 @@ static int flv_write_header(AVFormatContext *s)
 
     for (i = 0; i < s->nb_streams; i++) {
         AVCodecContext *enc = s->streams[i]->codec;
-        if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264) {
+        if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
             int64_t pos;
             avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
                      FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
@@ -342,7 +344,7 @@ static int flv_write_trailer(AVFormatContext *s)
     for (i = 0; i < s->nb_streams; i++) {
         AVCodecContext *enc = s->streams[i]->codec;
         if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
-                enc->codec_id == CODEC_ID_H264) {
+                (enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4)) {
             put_avc_eos_tag(pb, flv->last_video_ts);
         }
     }
@@ -374,7 +376,7 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
     if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
        enc->codec_id == CODEC_ID_AAC)
         flags_size= 2;
-    else if(enc->codec_id == CODEC_ID_H264)
+    else if(enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4)
         flags_size= 5;
     else
         flags_size= 1;
@@ -398,7 +400,7 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
         avio_w8(pb, FLV_TAG_TYPE_AUDIO);
     }
 
-    if (enc->codec_id == CODEC_ID_H264) {
+    if (enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
         /* check if extradata looks like mp4 formated */
         if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
             if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
@@ -428,7 +430,7 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
         avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
     else if (enc->codec_id == CODEC_ID_AAC)
         avio_w8(pb,1); // AAC raw
-    else if (enc->codec_id == CODEC_ID_H264) {
+    else if (enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
         avio_w8(pb,1); // AVC NALU
         avio_wb24(pb,pkt->pts - pkt->dts);
     }