diff --git a/libavformat/internal.h b/libavformat/internal.h
index 51deb1c49f..16f84374f7 100644
--- a/libavformat/internal.h
+++ b/libavformat/internal.h
@@ -781,15 +781,6 @@ enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
  */
 int ff_generate_avci_extradata(AVStream *st);
 
-/**
- * Copy encoding parameters from source to destination stream
- *
- * @param dst pointer to destination AVStream
- * @param src pointer to source AVStream
- * @return >=0 on success, AVERROR code on error
- */
-int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src);
-
 /**
  * Copy side data from source to destination stream
  *
diff --git a/libavformat/mux.h b/libavformat/mux.h
index 1bfcaf795f..c01da82194 100644
--- a/libavformat/mux.h
+++ b/libavformat/mux.h
@@ -113,6 +113,15 @@ int ff_format_shift_data(AVFormatContext *s, int64_t read_start, int shift_size)
  */
 int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
 
+/**
+ * Copy encoding parameters from source to destination stream
+ *
+ * @param dst pointer to destination AVStream
+ * @param src pointer to source AVStream
+ * @return >=0 on success, AVERROR code on error
+ */
+int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src);
+
 /**
  * Parse creation_time in AVFormatContext metadata if exists and warn if the
  * parsing fails.
diff --git a/libavformat/mux_utils.c b/libavformat/mux_utils.c
index 2fa2ab5b0f..eb8ea3d560 100644
--- a/libavformat/mux_utils.c
+++ b/libavformat/mux_utils.c
@@ -121,6 +121,34 @@ int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **op
     return 0;
 }
 
+int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src)
+{
+    int ret;
+
+    dst->id                  = src->id;
+    dst->time_base           = src->time_base;
+    dst->nb_frames           = src->nb_frames;
+    dst->disposition         = src->disposition;
+    dst->sample_aspect_ratio = src->sample_aspect_ratio;
+    dst->avg_frame_rate      = src->avg_frame_rate;
+    dst->r_frame_rate        = src->r_frame_rate;
+
+    av_dict_free(&dst->metadata);
+    ret = av_dict_copy(&dst->metadata, src->metadata, 0);
+    if (ret < 0)
+        return ret;
+
+    ret = avcodec_parameters_copy(dst->codecpar, src->codecpar);
+    if (ret < 0)
+        return ret;
+
+    ret = ff_stream_side_data_copy(dst, src);
+    if (ret < 0)
+        return ret;
+
+    return 0;
+}
+
 int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds)
 {
     AVDictionaryEntry *entry;
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 44ceeecac6..5bda45d124 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -553,34 +553,6 @@ int av_read_pause(AVFormatContext *s)
     return AVERROR(ENOSYS);
 }
 
-int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src)
-{
-    int ret;
-
-    dst->id                  = src->id;
-    dst->time_base           = src->time_base;
-    dst->nb_frames           = src->nb_frames;
-    dst->disposition         = src->disposition;
-    dst->sample_aspect_ratio = src->sample_aspect_ratio;
-    dst->avg_frame_rate      = src->avg_frame_rate;
-    dst->r_frame_rate        = src->r_frame_rate;
-
-    av_dict_free(&dst->metadata);
-    ret = av_dict_copy(&dst->metadata, src->metadata, 0);
-    if (ret < 0)
-        return ret;
-
-    ret = avcodec_parameters_copy(dst->codecpar, src->codecpar);
-    if (ret < 0)
-        return ret;
-
-    ret = ff_stream_side_data_copy(dst, src);
-    if (ret < 0)
-        return ret;
-
-    return 0;
-}
-
 int ff_stream_side_data_copy(AVStream *dst, const AVStream *src)
 {
     /* Free existing side data*/
diff --git a/libavformat/webm_chunk.c b/libavformat/webm_chunk.c
index 9348e6680a..d69db3a004 100644
--- a/libavformat/webm_chunk.c
+++ b/libavformat/webm_chunk.c
@@ -28,6 +28,7 @@
 #include "avio.h"
 #include "avio_internal.h"
 #include "internal.h"
+#include "mux.h"
 
 #include "libavutil/log.h"
 #include "libavutil/opt.h"