diff --git a/ffserver.c b/ffserver.c
index 0ee61e2e50..3ad40e9bfb 100644
--- a/ffserver.c
+++ b/ffserver.c
@@ -33,6 +33,8 @@
 #include "libavformat/os_support.h"
 #include "libavformat/rtpdec.h"
 #include "libavformat/rtsp.h"
+// XXX for ffio_open_dyn_packet_buffer, to be removed
+#include "libavformat/avio_internal.h"
 #include "libavutil/avstring.h"
 #include "libavutil/lfg.h"
 #include "libavutil/random_seed.h"
@@ -2389,7 +2391,7 @@ static int http_prepare_data(HTTPContext *c)
                             max_packet_size = RTSP_TCP_MAX_PACKET_SIZE;
                         else
                             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);
+                        ret = ffio_open_dyn_packet_buf(&ctx->pb, max_packet_size);
                     } else {
                         ret = avio_open_dyn_buf(&ctx->pb);
                     }
@@ -3444,7 +3446,7 @@ static int rtp_new_av_stream(HTTPContext *c,
              c->stream->filename, stream_index, c->protocol);
 
     /* normally, no packets should be output here, but the packet size may be checked */
-    if (url_open_dyn_packet_buf(&ctx->pb, max_packet_size) < 0) {
+    if (ffio_open_dyn_packet_buf(&ctx->pb, max_packet_size) < 0) {
         /* XXX: close stream */
         goto fail;
     }
diff --git a/libavformat/avio.h b/libavformat/avio.h
index 5bc85827d1..69896d1404 100644
--- a/libavformat/avio.h
+++ b/libavformat/avio.h
@@ -448,6 +448,7 @@ 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);
+attribute_deprecated int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
 attribute_deprecated int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer);
 /**
  * @}
@@ -684,22 +685,10 @@ attribute_deprecated int url_close_buf(AVIOContext *s);
  */
 int avio_open_dyn_buf(AVIOContext **s);
 
-/**
- * Open a write only packetized memory stream with a maximum packet
- * size of 'max_packet_size'.  The stream is stored in a memory buffer
- * with a big endian 4 byte header giving the packet size in bytes.
- *
- * @param s new IO context
- * @param max_packet_size maximum packet size (must be > 0)
- * @return zero if no error.
- */
-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
- * 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.
+ * must be freed with av_free().
+ * Padding of FF_INPUT_BUFFER_PADDING_SIZE is added to the buffer.
  *
  * @param s IO context
  * @param pbuffer pointer to a byte buffer
diff --git a/libavformat/avio_internal.h b/libavformat/avio_internal.h
index 916de8fcc7..29553ed614 100644
--- a/libavformat/avio_internal.h
+++ b/libavformat/avio_internal.h
@@ -81,4 +81,15 @@ unsigned long ffio_get_checksum(AVIOContext *s);
 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
                                     unsigned int len);
 
+/**
+ * Open a write only packetized memory stream with a maximum packet
+ * size of 'max_packet_size'.  The stream is stored in a memory buffer
+ * with a big endian 4 byte header giving the packet size in bytes.
+ *
+ * @param s new IO context
+ * @param max_packet_size maximum packet size (must be > 0)
+ * @return zero if no error.
+ */
+int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
+
 #endif // AVFORMAT_AVIO_INTERNAL_H
diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index cb5f2790f7..73045e6599 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -423,6 +423,10 @@ int url_open_dyn_buf(AVIOContext **s)
 {
     return avio_open_dyn_buf(s);
 }
+int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
+{
+    return ffio_open_dyn_packet_buf(s, max_packet_size);
+}
 int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
 {
     return avio_close_dyn_buf(s, pbuffer);
@@ -1160,7 +1164,7 @@ int avio_open_dyn_buf(AVIOContext **s)
     return url_open_dyn_buf_internal(s, 0);
 }
 
-int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
+int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
 {
     if (max_packet_size <= 0)
         return -1;
diff --git a/libavformat/movenchint.c b/libavformat/movenchint.c
index eb93ef8d7e..615714627c 100644
--- a/libavformat/movenchint.c
+++ b/libavformat/movenchint.c
@@ -23,6 +23,7 @@
 #include "libavutil/intreadwrite.h"
 #include "internal.h"
 #include "rtpenc_chain.h"
+#include "avio_internal.h"
 
 int ff_mov_init_hinting(AVFormatContext *s, int index, int src_index)
 {
@@ -409,7 +410,7 @@ int ff_mov_add_hinted_packet(AVFormatContext *s, AVPacket *pkt,
     /* Fetch the output from the RTP muxer, open a new output buffer
      * for next time. */
     size = avio_close_dyn_buf(rtp_ctx->pb, &buf);
-    if ((ret = url_open_dyn_packet_buf(&rtp_ctx->pb,
+    if ((ret = ffio_open_dyn_packet_buf(&rtp_ctx->pb,
                                        RTP_MAX_PACKET_SIZE)) < 0)
         goto done;
 
diff --git a/libavformat/rtpdec.c b/libavformat/rtpdec.c
index bbd5f338ed..281f51c443 100644
--- a/libavformat/rtpdec.c
+++ b/libavformat/rtpdec.c
@@ -41,7 +41,7 @@
          buffer to 'rtp_write_packet' contains all the packets for ONE
          frame. Each packet should have a four byte header containing
          the length in big endian format (same trick as
-         'url_open_dyn_packet_buf')
+         'ffio_open_dyn_packet_buf')
 */
 
 static RTPDynamicProtocolHandler ff_realmedia_mp3_dynamic_handler = {
diff --git a/libavformat/rtpenc_chain.c b/libavformat/rtpenc_chain.c
index 77633ed53e..a923b2deb6 100644
--- a/libavformat/rtpenc_chain.c
+++ b/libavformat/rtpenc_chain.c
@@ -21,6 +21,7 @@
 
 #include "avformat.h"
 #include "rtpenc_chain.h"
+#include "avio_internal.h"
 
 AVFormatContext *ff_rtp_chain_mux_open(AVFormatContext *s, AVStream *st,
                                        URLContext *handle, int packet_size)
@@ -55,7 +56,7 @@ AVFormatContext *ff_rtp_chain_mux_open(AVFormatContext *s, AVStream *st,
     if (handle) {
         url_fdopen(&rtpctx->pb, handle);
     } else
-        url_open_dyn_packet_buf(&rtpctx->pb, packet_size);
+        ffio_open_dyn_packet_buf(&rtpctx->pb, packet_size);
     ret = av_write_header(rtpctx);
 
     if (ret) {
diff --git a/libavformat/rtspenc.c b/libavformat/rtspenc.c
index e3631c4290..7f52b1fdb1 100644
--- a/libavformat/rtspenc.c
+++ b/libavformat/rtspenc.c
@@ -29,6 +29,7 @@
 #include "os_support.h"
 #include "rtsp.h"
 #include "internal.h"
+#include "avio_internal.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/avstring.h"
 
@@ -142,7 +143,7 @@ static int tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st)
         int id;
         /* The interleaving header is exactly 4 bytes, which happens to be
          * the same size as the packet length header from
-         * url_open_dyn_packet_buf. So by writing the interleaving header
+         * ffio_open_dyn_packet_buf. So by writing the interleaving header
          * over these bytes, we get a consecutive interleaved packet
          * that can be written in one call. */
         interleaved_packet = interleave_header = ptr;
@@ -162,7 +163,7 @@ static int tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st)
         size -= packet_len;
     }
     av_free(buf);
-    url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
+    ffio_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
     return 0;
 }