diff --git a/ffserver.c b/ffserver.c
index bc056dd9f0..c4a9ddf10f 100644
--- a/ffserver.c
+++ b/ffserver.c
@@ -869,7 +869,7 @@ static void close_connection(HTTPContext *c)
     if (!c->last_packet_sent && c->state == HTTPSTATE_SEND_DATA_TRAILER) {
         if (ctx->oformat) {
             /* prepare header */
-            if (url_open_dyn_buf(&ctx->pb) >= 0) {
+            if (avio_open_dyn_buf(&ctx->pb) >= 0) {
                 av_write_trailer(ctx);
                 av_freep(&c->pb_buffer);
                 url_close_dyn_buf(ctx->pb, &c->pb_buffer);
@@ -1873,7 +1873,7 @@ static void compute_status(HTTPContext *c)
     int i, len;
     AVIOContext *pb;
 
-    if (url_open_dyn_buf(&pb) < 0) {
+    if (avio_open_dyn_buf(&pb) < 0) {
         /* XXX: return an error ? */
         c->buffer_ptr = c->buffer;
         c->buffer_end = c->buffer;
@@ -2256,7 +2256,7 @@ static int http_prepare_data(HTTPContext *c)
         c->got_key_frame = 0;
 
         /* prepare header and save header data in a stream */
-        if (url_open_dyn_buf(&c->fmt_ctx.pb) < 0) {
+        if (avio_open_dyn_buf(&c->fmt_ctx.pb) < 0) {
             /* XXX: potential leak */
             return -1;
         }
@@ -2391,7 +2391,7 @@ static int http_prepare_data(HTTPContext *c)
                             max_packet_size = url_get_max_packet_size(c->rtp_handles[c->packet_stream_index]);
                         ret = url_open_dyn_packet_buf(&ctx->pb, max_packet_size);
                     } else {
-                        ret = url_open_dyn_buf(&ctx->pb);
+                        ret = avio_open_dyn_buf(&ctx->pb);
                     }
                     if (ret < 0) {
                         /* XXX: potential leak */
@@ -2432,7 +2432,7 @@ static int http_prepare_data(HTTPContext *c)
             return -1;
         ctx = &c->fmt_ctx;
         /* prepare header */
-        if (url_open_dyn_buf(&ctx->pb) < 0) {
+        if (avio_open_dyn_buf(&ctx->pb) < 0) {
             /* XXX: potential leak */
             return -1;
         }
@@ -2503,7 +2503,7 @@ static int http_send_data(HTTPContext *c)
                     /* if already sending something, then wait. */
                     if (rtsp_c->state != RTSPSTATE_WAIT_REQUEST)
                         break;
-                    if (url_open_dyn_buf(&pb) < 0)
+                    if (avio_open_dyn_buf(&pb) < 0)
                         goto fail1;
                     interleaved_index = c->packet_stream_index * 2;
                     /* RTCP packets are sent at odd indexes */
@@ -2850,7 +2850,7 @@ static int rtsp_parse_request(HTTPContext *c)
     av_strlcpy(c->url, url, sizeof(c->url));
     av_strlcpy(c->protocol, protocol, sizeof(c->protocol));
 
-    if (url_open_dyn_buf(&c->pb) < 0) {
+    if (avio_open_dyn_buf(&c->pb) < 0) {
         /* XXX: cannot do more */
         c->pb = NULL; /* safety */
         return -1;
diff --git a/libavformat/asfenc.c b/libavformat/asfenc.c
index c029c0e163..40ccc19a32 100644
--- a/libavformat/asfenc.c
+++ b/libavformat/asfenc.c
@@ -234,7 +234,7 @@ static void put_str16(AVIOContext *s, const char *tag)
     int len;
     uint8_t *pb;
     AVIOContext *dyn_buf;
-    if (url_open_dyn_buf(&dyn_buf) < 0)
+    if (avio_open_dyn_buf(&dyn_buf) < 0)
         return;
 
     avio_put_str16le(dyn_buf, tag);
@@ -366,7 +366,7 @@ static int asf_write_header1(AVFormatContext *s, int64_t file_size, int64_t data
         uint8_t *buf;
         AVIOContext *dyn_buf;
 
-        if (url_open_dyn_buf(&dyn_buf) < 0)
+        if (avio_open_dyn_buf(&dyn_buf) < 0)
             return AVERROR(ENOMEM);
 
         hpos = put_header(pb, &ff_asf_comment_header);
@@ -497,7 +497,7 @@ static int asf_write_header1(AVFormatContext *s, int64_t file_size, int64_t data
         else
             desc = p ? p->name : enc->codec_name;
 
-        if ( url_open_dyn_buf(&dyn_buf) < 0)
+        if ( avio_open_dyn_buf(&dyn_buf) < 0)
             return AVERROR(ENOMEM);
 
         avio_put_str16le(dyn_buf, desc);
diff --git a/libavformat/avc.c b/libavformat/avc.c
index 3b990015fe..274b490cf5 100644
--- a/libavformat/avc.c
+++ b/libavformat/avc.c
@@ -89,7 +89,7 @@ int ff_avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size)
 int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
 {
     AVIOContext *pb;
-    int ret = url_open_dyn_buf(&pb);
+    int ret = avio_open_dyn_buf(&pb);
     if(ret < 0)
         return ret;
 
diff --git a/libavformat/avio.h b/libavformat/avio.h
index 80446b4808..9e21057b85 100644
--- a/libavformat/avio.h
+++ b/libavformat/avio.h
@@ -447,6 +447,7 @@ attribute_deprecated int url_fprintf(AVIOContext *s, const char *fmt, ...) __att
 attribute_deprecated int url_fprintf(AVIOContext *s, const char *fmt, ...);
 #endif
 attribute_deprecated void put_flush_packet(AVIOContext *s);
+attribute_deprecated int url_open_dyn_buf(AVIOContext **s);
 /**
  * @}
  */
@@ -680,7 +681,7 @@ attribute_deprecated int url_close_buf(AVIOContext *s);
  * @param s new IO context
  * @return zero if no error.
  */
-int url_open_dyn_buf(AVIOContext **s);
+int avio_open_dyn_buf(AVIOContext **s);
 
 /**
  * Open a write only packetized memory stream with a maximum packet
@@ -696,7 +697,7 @@ int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
 /**
  * Return the written size and a pointer to the buffer. The buffer
  * must be freed with av_free(). If the buffer is opened with
- * url_open_dyn_buf, then padding of FF_INPUT_BUFFER_PADDING_SIZE is
+ * avio_open_dyn_buf, then padding of FF_INPUT_BUFFER_PADDING_SIZE is
  * added; if opened with url_open_dyn_packet_buf, no padding is added.
  *
  * @param s IO context
diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index dd997d73e2..53fce9e724 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -419,6 +419,10 @@ unsigned long get_checksum(AVIOContext *s)
 {
     return ffio_get_checksum(s);
 }
+int url_open_dyn_buf(AVIOContext **s)
+{
+    return avio_open_dyn_buf(s);
+}
 #endif
 
 int avio_put_str(AVIOContext *s, const char *str)
@@ -1023,7 +1027,7 @@ int64_t ffio_read_seek(AVIOContext *s, int stream_index,
     return ret;
 }
 
-/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
+/* avio_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
  * back to the server even if CONFIG_MUXERS is false. */
 #if CONFIG_MUXERS || CONFIG_NETWORK
 /* buffer handling */
@@ -1147,7 +1151,7 @@ static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
     return ret;
 }
 
-int url_open_dyn_buf(AVIOContext **s)
+int avio_open_dyn_buf(AVIOContext **s)
 {
     return url_open_dyn_buf_internal(s, 0);
 }
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index a06891d8b8..f32ab92171 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -455,7 +455,7 @@ static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecCo
     uint8_t *codecpriv;
     int ret, codecpriv_size;
 
-    ret = url_open_dyn_buf(&dyn_cp);
+    ret = avio_open_dyn_buf(&dyn_cp);
     if(ret < 0)
         return ret;
 
@@ -1026,7 +1026,7 @@ static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
 
     if (!s->pb->seekable) {
         if (!mkv->dyn_bc)
-            url_open_dyn_buf(&mkv->dyn_bc);
+            avio_open_dyn_buf(&mkv->dyn_bc);
         pb = mkv->dyn_bc;
     }
 
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 0c5de80d3c..6b7da183d8 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -1660,7 +1660,7 @@ static int mov_write_udta_tag(AVIOContext *pb, MOVMuxContext *mov,
             return 0;
         }
 
-    ret = url_open_dyn_buf(&pb_buf);
+    ret = avio_open_dyn_buf(&pb_buf);
     if(ret < 0)
         return ret;
 
diff --git a/libavformat/movenchint.c b/libavformat/movenchint.c
index 3db8d65f46..567197ee45 100644
--- a/libavformat/movenchint.c
+++ b/libavformat/movenchint.c
@@ -417,7 +417,7 @@ int ff_mov_add_hinted_packet(AVFormatContext *s, AVPacket *pkt,
         goto done;
 
     /* Open a buffer for writing the hint */
-    if ((ret = url_open_dyn_buf(&hintbuf)) < 0)
+    if ((ret = avio_open_dyn_buf(&hintbuf)) < 0)
         goto done;
     av_init_packet(&hint_pkt);
     count = write_hint_packets(hintbuf, buf, size, trk, &hint_pkt.dts);
diff --git a/libavformat/mp3enc.c b/libavformat/mp3enc.c
index 8514ad1b51..2cbd5e224a 100644
--- a/libavformat/mp3enc.c
+++ b/libavformat/mp3enc.c
@@ -96,7 +96,7 @@ static int id3v2_put_ttag(AVFormatContext *s, const char *str1, const char *str2
     uint8_t *pb;
     int (*put)(AVIOContext*, const char*);
     AVIOContext *dyn_buf;
-    if (url_open_dyn_buf(&dyn_buf) < 0)
+    if (avio_open_dyn_buf(&dyn_buf) < 0)
         return AVERROR(ENOMEM);
 
     /* check if the strings are ASCII-only and use UTF16 only if
diff --git a/libavformat/nutenc.c b/libavformat/nutenc.c
index a72e510d81..5463749a50 100644
--- a/libavformat/nutenc.c
+++ b/libavformat/nutenc.c
@@ -436,7 +436,7 @@ static int write_globalinfo(NUTContext *nut, AVIOContext *bc){
     AVIOContext *dyn_bc;
     uint8_t *dyn_buf=NULL;
     int count=0, dyn_size;
-    int ret = url_open_dyn_buf(&dyn_bc);
+    int ret = avio_open_dyn_buf(&dyn_bc);
     if(ret < 0)
         return ret;
 
@@ -462,7 +462,7 @@ static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){
     AVIOContext *dyn_bc;
     uint8_t *dyn_buf=NULL;
     int count=0, dyn_size, i;
-    int ret = url_open_dyn_buf(&dyn_bc);
+    int ret = avio_open_dyn_buf(&dyn_bc);
     if(ret < 0)
         return ret;
 
@@ -495,7 +495,7 @@ static int write_chapter(NUTContext *nut, AVIOContext *bc, int id)
     AVChapter *ch    = nut->avf->chapters[id];
     int ret, dyn_size, count = 0;
 
-    ret = url_open_dyn_buf(&dyn_bc);
+    ret = avio_open_dyn_buf(&dyn_bc);
     if (ret < 0)
         return ret;
 
@@ -522,14 +522,14 @@ static int write_headers(AVFormatContext *avctx, AVIOContext *bc){
 
     ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);
 
-    ret = url_open_dyn_buf(&dyn_bc);
+    ret = avio_open_dyn_buf(&dyn_bc);
     if(ret < 0)
         return ret;
     write_mainheader(nut, dyn_bc);
     put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
 
     for (i=0; i < nut->avf->nb_streams; i++){
-        ret = url_open_dyn_buf(&dyn_bc);
+        ret = avio_open_dyn_buf(&dyn_bc);
         if(ret < 0)
             return ret;
         if ((ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i)) < 0)
@@ -537,14 +537,14 @@ static int write_headers(AVFormatContext *avctx, AVIOContext *bc){
         put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
     }
 
-    ret = url_open_dyn_buf(&dyn_bc);
+    ret = avio_open_dyn_buf(&dyn_bc);
     if(ret < 0)
         return ret;
     write_globalinfo(nut, dyn_bc);
     put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
 
     for (i = 0; i < nut->avf->nb_streams; i++) {
-        ret = url_open_dyn_buf(&dyn_bc);
+        ret = avio_open_dyn_buf(&dyn_bc);
         if(ret < 0)
             return ret;
         ret = write_streaminfo(nut, dyn_bc, i);
@@ -560,7 +560,7 @@ static int write_headers(AVFormatContext *avctx, AVIOContext *bc){
     }
 
     for (i = 0; i < nut->avf->nb_chapters; i++) {
-        ret = url_open_dyn_buf(&dyn_bc);
+        ret = avio_open_dyn_buf(&dyn_bc);
         if (ret < 0)
             return ret;
         ret = write_chapter(nut, dyn_bc, i);
@@ -728,7 +728,7 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt){
                          NULL);
 
         nut->last_syncpoint_pos= avio_tell(bc);
-        ret = url_open_dyn_buf(&dyn_bc);
+        ret = avio_open_dyn_buf(&dyn_bc);
         if(ret < 0)
             return ret;
         put_tt(nut, nus->time_base, dyn_bc, pkt->dts);
diff --git a/libavformat/oggenc.c b/libavformat/oggenc.c
index e0dc5332ae..8a0fffb138 100644
--- a/libavformat/oggenc.c
+++ b/libavformat/oggenc.c
@@ -82,7 +82,7 @@ static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
     int ret, size;
     uint8_t *buf;
 
-    ret = url_open_dyn_buf(&pb);
+    ret = avio_open_dyn_buf(&pb);
     if (ret < 0)
         return ret;
     ffio_init_checksum(pb, ff_crc04C11DB7_update, 0);
diff --git a/libavformat/rtpdec.c b/libavformat/rtpdec.c
index 0e4665b7ea..3d03b815c2 100644
--- a/libavformat/rtpdec.c
+++ b/libavformat/rtpdec.c
@@ -264,7 +264,7 @@ int rtp_check_and_send_back_rr(RTPDemuxContext *s, int count)
         return -1;
     s->last_octet_count = s->octet_count;
 
-    if (url_open_dyn_buf(&pb) < 0)
+    if (avio_open_dyn_buf(&pb) < 0)
         return -1;
 
     // Receiver Report
@@ -339,7 +339,7 @@ void rtp_send_punch_packets(URLContext* rtp_handle)
     int len;
 
     /* Send a small RTP packet */
-    if (url_open_dyn_buf(&pb) < 0)
+    if (avio_open_dyn_buf(&pb) < 0)
         return;
 
     avio_w8(pb, (RTP_VERSION << 6));
@@ -355,7 +355,7 @@ void rtp_send_punch_packets(URLContext* rtp_handle)
     av_free(buf);
 
     /* Send a minimal RTCP RR */
-    if (url_open_dyn_buf(&pb) < 0)
+    if (avio_open_dyn_buf(&pb) < 0)
         return;
 
     avio_w8(pb, (RTP_VERSION << 6));
diff --git a/libavformat/rtpdec_asf.c b/libavformat/rtpdec_asf.c
index 69fec8d683..ae9d53c2a3 100644
--- a/libavformat/rtpdec_asf.c
+++ b/libavformat/rtpdec_asf.c
@@ -208,7 +208,7 @@ static int asfrtp_parse_packet(AVFormatContext *s, PayloadContext *asf,
                     av_free(p);
                 }
                 if (!len_off && !asf->pktbuf &&
-                    (res = url_open_dyn_buf(&asf->pktbuf)) < 0)
+                    (res = avio_open_dyn_buf(&asf->pktbuf)) < 0)
                     return res;
                 if (!asf->pktbuf)
                     return AVERROR(EIO);
diff --git a/libavformat/rtpdec_latm.c b/libavformat/rtpdec_latm.c
index 14a547a114..e3f1604a54 100644
--- a/libavformat/rtpdec_latm.c
+++ b/libavformat/rtpdec_latm.c
@@ -65,7 +65,7 @@ static int latm_parse_packet(AVFormatContext *ctx, PayloadContext *data,
             av_freep(&data->buf);
 
             data->timestamp = *timestamp;
-            if ((ret = url_open_dyn_buf(&data->dyn_buf)) < 0)
+            if ((ret = avio_open_dyn_buf(&data->dyn_buf)) < 0)
                 return ret;
         }
         avio_write(data->dyn_buf, buf, len);
diff --git a/libavformat/rtpdec_svq3.c b/libavformat/rtpdec_svq3.c
index 7a2fc9c686..e93e31c0e2 100644
--- a/libavformat/rtpdec_svq3.c
+++ b/libavformat/rtpdec_svq3.c
@@ -86,7 +86,7 @@ static int svq3_parse_packet (AVFormatContext *s, PayloadContext *sv,
             url_close_dyn_buf(sv->pktbuf, &tmp);
             av_free(tmp);
         }
-        if ((res = url_open_dyn_buf(&sv->pktbuf)) < 0)
+        if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0)
             return res;
         sv->timestamp   = *timestamp;
     }
diff --git a/libavformat/rtpdec_vp8.c b/libavformat/rtpdec_vp8.c
index b0c59b9a85..f0ebb3173a 100644
--- a/libavformat/rtpdec_vp8.c
+++ b/libavformat/rtpdec_vp8.c
@@ -85,7 +85,7 @@ static int vp8_handle_packet(AVFormatContext *ctx,
             // that for the next av_get_packet call
             ret = end_packet ? 1 : 0;
         }
-        if ((res = url_open_dyn_buf(&vp8->data)) < 0)
+        if ((res = avio_open_dyn_buf(&vp8->data)) < 0)
             return res;
         vp8->is_keyframe = *buf & 1;
         vp8->timestamp   = ts;
diff --git a/libavformat/rtpdec_xiph.c b/libavformat/rtpdec_xiph.c
index e42ee61fe3..9eb1ec2352 100644
--- a/libavformat/rtpdec_xiph.c
+++ b/libavformat/rtpdec_xiph.c
@@ -176,7 +176,7 @@ static int xiph_handle_packet(AVFormatContext * ctx,
         // end packet has been lost somewhere, so drop buffered data
         free_fragment_if_needed(data);
 
-        if((res = url_open_dyn_buf(&data->fragment)) < 0)
+        if((res = avio_open_dyn_buf(&data->fragment)) < 0)
             return res;
 
         avio_write(data->fragment, buf, pkt_len);