diff --git a/libavformat/mux.c b/libavformat/mux.c
index 9b4b0b1249..34c9328c33 100644
--- a/libavformat/mux.c
+++ b/libavformat/mux.c
@@ -836,3 +836,25 @@ int av_get_output_timestamp(struct AVFormatContext *s, int stream,
     s->oformat->get_output_timestamp(s, stream, dts, wall);
     return 0;
 }
+
+int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
+                     AVFormatContext *src)
+{
+    AVPacket local_pkt;
+
+    local_pkt = *pkt;
+    local_pkt.stream_index = dst_stream;
+    if (pkt->pts != AV_NOPTS_VALUE)
+        local_pkt.pts = av_rescale_q(pkt->pts,
+                                     src->streams[pkt->stream_index]->time_base,
+                                     dst->streams[dst_stream]->time_base);
+    if (pkt->dts != AV_NOPTS_VALUE)
+        local_pkt.dts = av_rescale_q(pkt->dts,
+                                     src->streams[pkt->stream_index]->time_base,
+                                     dst->streams[dst_stream]->time_base);
+    if (pkt->duration)
+        local_pkt.duration = av_rescale_q(pkt->duration,
+                                          src->streams[pkt->stream_index]->time_base,
+                                          dst->streams[dst_stream]->time_base);
+    return av_write_frame(dst, &local_pkt);
+}
diff --git a/libavformat/utils.c b/libavformat/utils.c
index c955cf4bc3..a6b6f5368c 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -3884,28 +3884,6 @@ int ff_url_join(char *str, int size, const char *proto,
     return strlen(str);
 }
 
-int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
-                     AVFormatContext *src)
-{
-    AVPacket local_pkt;
-
-    local_pkt = *pkt;
-    local_pkt.stream_index = dst_stream;
-    if (pkt->pts != AV_NOPTS_VALUE)
-        local_pkt.pts = av_rescale_q(pkt->pts,
-                                     src->streams[pkt->stream_index]->time_base,
-                                     dst->streams[dst_stream]->time_base);
-    if (pkt->dts != AV_NOPTS_VALUE)
-        local_pkt.dts = av_rescale_q(pkt->dts,
-                                     src->streams[pkt->stream_index]->time_base,
-                                     dst->streams[dst_stream]->time_base);
-    if (pkt->duration)
-        local_pkt.duration = av_rescale_q(pkt->duration,
-                                          src->streams[pkt->stream_index]->time_base,
-                                          dst->streams[dst_stream]->time_base);
-    return av_write_frame(dst, &local_pkt);
-}
-
 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
                         void *context)
 {