diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
index 561e3ff736..d130f03ea6 100644
--- a/libavformat/hlsenc.c
+++ b/libavformat/hlsenc.c
@@ -459,7 +459,6 @@ static int flush_dynbuf(VariantStream *vs, int *range_length)
 
     // flush
     av_write_frame(ctx, NULL);
-    avio_flush(ctx->pb);
 
     // write out to file
     *range_length = avio_close_dyn_buf(ctx->pb, &vs->temp_buffer);
@@ -2548,7 +2547,6 @@ static int hls_write_trailer(struct AVFormatContext *s)
             if (!vs->init_range_length) {
                 uint8_t *buffer = NULL;
                 av_write_frame(oc, NULL); /* Flush any buffered data */
-                avio_flush(oc->pb);
 
                 range_length = avio_close_dyn_buf(oc->pb, &buffer);
                 avio_write(vs->out, buffer, range_length);
diff --git a/libavformat/oggenc.c b/libavformat/oggenc.c
index d3ae07351d..04f7813083 100644
--- a/libavformat/oggenc.c
+++ b/libavformat/oggenc.c
@@ -133,7 +133,6 @@ static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
     avio_write(pb, page->data, page->size);
 
     ogg_update_checksum(s, pb, crc_offset);
-    avio_flush(pb);
 
     size = avio_close_dyn_buf(pb, &buf);
     if (size < 0)
diff --git a/libavformat/rtpdec.c b/libavformat/rtpdec.c
index e75a34cb93..3d5b200099 100644
--- a/libavformat/rtpdec.c
+++ b/libavformat/rtpdec.c
@@ -415,7 +415,6 @@ void ff_rtp_send_punch_packets(URLContext *rtp_handle)
     avio_wb32(pb, 0); /* Timestamp */
     avio_wb32(pb, 0); /* SSRC */
 
-    avio_flush(pb);
     len = avio_close_dyn_buf(pb, &buf);
     if ((len > 0) && buf)
         ffurl_write(rtp_handle, buf, len);
@@ -430,7 +429,6 @@ void ff_rtp_send_punch_packets(URLContext *rtp_handle)
     avio_wb16(pb, 1); /* length in words - 1 */
     avio_wb32(pb, 0); /* our own SSRC */
 
-    avio_flush(pb);
     len = avio_close_dyn_buf(pb, &buf);
     if ((len > 0) && buf)
         ffurl_write(rtp_handle, buf, len);