diff --git a/libavformat/dashenc.c b/libavformat/dashenc.c
index 8b6be7133e..98036d3fec 100644
--- a/libavformat/dashenc.c
+++ b/libavformat/dashenc.c
@@ -155,8 +155,7 @@ static void set_codec_str(AVFormatContext *s, AVCodecContext *codec,
             if (avio_open_dyn_buf(&pb) < 0)
                 return;
             if (ff_isom_write_avcc(pb, extradata, extradata_size) < 0) {
-                avio_close_dyn_buf(pb, &tmpbuf);
-                av_free(tmpbuf);
+                ffio_free_dyn_buf(&pb);
                 return;
             }
             extradata_size = avio_close_dyn_buf(pb, &extradata);
diff --git a/libavformat/id3v2.c b/libavformat/id3v2.c
index dae4aeb7c9..a8273e282c 100644
--- a/libavformat/id3v2.c
+++ b/libavformat/id3v2.c
@@ -265,8 +265,8 @@ static int decode_str(AVFormatContext *s, AVIOContext *pb, int encoding,
     case ID3v2_ENCODING_UTF16BOM:
         if ((left -= 2) < 0) {
             av_log(s, AV_LOG_ERROR, "Cannot read BOM value, input too short\n");
-            avio_close_dyn_buf(dynbuf, dst);
-            av_freep(dst);
+            ffio_free_dyn_buf(&dynbuf);
+            *dst = NULL;
             return AVERROR_INVALIDDATA;
         }
         switch (avio_rb16(pb)) {
@@ -276,8 +276,8 @@ static int decode_str(AVFormatContext *s, AVIOContext *pb, int encoding,
             break;
         default:
             av_log(s, AV_LOG_ERROR, "Incorrect BOM value\n");
-            avio_close_dyn_buf(dynbuf, dst);
-            av_freep(dst);
+            ffio_free_dyn_buf(&dynbuf);
+            *dst = NULL;
             *maxread = left;
             return AVERROR_INVALIDDATA;
         }
diff --git a/libavformat/movenchint.c b/libavformat/movenchint.c
index 006aa09f62..9e667edce4 100644
--- a/libavformat/movenchint.c
+++ b/libavformat/movenchint.c
@@ -459,7 +459,6 @@ done:
 void ff_mov_close_hinting(MOVTrack *track)
 {
     AVFormatContext *rtp_ctx = track->rtp_ctx;
-    uint8_t *ptr;
 
     av_freep(&track->enc);
     sample_queue_free(&track->sample_queue);
@@ -467,8 +466,7 @@ void ff_mov_close_hinting(MOVTrack *track)
         return;
     if (rtp_ctx->pb) {
         av_write_trailer(rtp_ctx);
-        avio_close_dyn_buf(rtp_ctx->pb, &ptr);
-        av_free(ptr);
+        ffio_free_dyn_buf(&rtp_ctx->pb);
     }
     avformat_free_context(rtp_ctx);
 }
diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c
index a56ca0eaa5..11dcf9ce49 100644
--- a/libavformat/mpegtsenc.c
+++ b/libavformat/mpegtsenc.c
@@ -30,6 +30,7 @@
 #include "libavcodec/internal.h"
 
 #include "avformat.h"
+#include "avio_internal.h"
 #include "internal.h"
 #include "mpegts.h"
 
@@ -1327,9 +1328,7 @@ static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
 
             ret = av_write_frame(ts_st->amux, &pkt2);
             if (ret < 0) {
-                avio_close_dyn_buf(ts_st->amux->pb, &data);
-                ts_st->amux->pb = NULL;
-                av_free(data);
+                ffio_free_dyn_buf(&ts_st->amux->pb);
                 return ret;
             }
             size            = avio_close_dyn_buf(ts_st->amux->pb, &data);
diff --git a/libavformat/nutenc.c b/libavformat/nutenc.c
index c335e6455a..b4b6dcd877 100644
--- a/libavformat/nutenc.c
+++ b/libavformat/nutenc.c
@@ -666,11 +666,8 @@ static int write_headers(AVFormatContext *avctx, AVIOContext *bc)
             return ret;
         if (ret > 0)
             put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
-        else {
-            uint8_t *buf;
-            avio_close_dyn_buf(dyn_bc, &buf);
-            av_free(buf);
-        }
+        else
+            ffio_free_dyn_buf(&dyn_bc);
     }
 
     for (i = 0; i < nut->avf->nb_chapters; i++) {
@@ -679,9 +676,7 @@ static int write_headers(AVFormatContext *avctx, AVIOContext *bc)
             return ret;
         ret = write_chapter(nut, dyn_bc, i);
         if (ret < 0) {
-            uint8_t *buf;
-            avio_close_dyn_buf(dyn_bc, &buf);
-            av_freep(&buf);
+            ffio_free_dyn_buf(&dyn_bc);
             return ret;
         }
         put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
diff --git a/libavformat/rtpenc_chain.c b/libavformat/rtpenc_chain.c
index 302c14c11a..74f306eb96 100644
--- a/libavformat/rtpenc_chain.c
+++ b/libavformat/rtpenc_chain.c
@@ -91,9 +91,7 @@ int ff_rtp_chain_mux_open(AVFormatContext **out, AVFormatContext *s,
         if (handle && rtpctx->pb) {
             avio_closep(&rtpctx->pb);
         } else if (rtpctx->pb) {
-            uint8_t *ptr;
-            avio_close_dyn_buf(rtpctx->pb, &ptr);
-            av_free(ptr);
+            ffio_free_dyn_buf(&rtpctx->pb);
         }
         avformat_free_context(rtpctx);
         return ret;
diff --git a/libavformat/rtpenc_mpegts.c b/libavformat/rtpenc_mpegts.c
index e0339bd58d..5b94e73d82 100644
--- a/libavformat/rtpenc_mpegts.c
+++ b/libavformat/rtpenc_mpegts.c
@@ -21,6 +21,7 @@
 
 #include "libavutil/mathematics.h"
 #include "avformat.h"
+#include "avio_internal.h"
 
 struct MuxChain {
     AVFormatContext *mpegts_ctx;
@@ -33,11 +34,7 @@ static int rtp_mpegts_write_close(AVFormatContext *s)
 
     if (chain->mpegts_ctx) {
         av_write_trailer(chain->mpegts_ctx);
-        if (chain->mpegts_ctx->pb) {
-            uint8_t *buf;
-            avio_close_dyn_buf(chain->mpegts_ctx->pb, &buf);
-            av_free(buf);
-        }
+        ffio_free_dyn_buf(&chain->mpegts_ctx->pb);
         avformat_free_context(chain->mpegts_ctx);
     }
     if (chain->rtp_ctx) {
@@ -101,11 +98,7 @@ static int rtp_mpegts_write_header(AVFormatContext *s)
 
 fail:
     if (mpegts_ctx) {
-        if (mpegts_ctx->pb) {
-            uint8_t *buf;
-            avio_close_dyn_buf(mpegts_ctx->pb, &buf);
-            av_free(buf);
-        }
+        ffio_free_dyn_buf(&chain->mpegts_ctx->pb);
         avformat_free_context(mpegts_ctx);
     }
     if (rtp_ctx)
diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index 890b77d866..529e34b297 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -710,11 +710,9 @@ void ff_rtsp_undo_setup(AVFormatContext *s, int send_packets)
                 AVFormatContext *rtpctx = rtsp_st->transport_priv;
                 av_write_trailer(rtpctx);
                 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
-                    uint8_t *ptr;
                     if (CONFIG_RTSP_MUXER && rtpctx->pb && send_packets)
                         ff_rtsp_tcp_write_packet(s, rtsp_st);
-                    avio_close_dyn_buf(rtpctx->pb, &ptr);
-                    av_free(ptr);
+                    ffio_free_dyn_buf(&rtpctx->pb);
                 } else {
                     avio_closep(&rtpctx->pb);
                 }