diff --git a/format_context.go b/format_context.go
index 63304db..598da91 100644
--- a/format_context.go
+++ b/format_context.go
@@ -106,6 +106,14 @@ func (fc *FormatContext) Metadata() *Dictionary {
 	return newDictionaryFromC(fc.c.metadata)
 }
 
+func (fc *FormatContext) SetMetadata(d *Dictionary) {
+	if d == nil {
+		fc.c.metadata = nil
+	} else {
+		fc.c.metadata = d.c
+	}
+}
+
 func (fc *FormatContext) NbStreams() int {
 	return int(fc.c.nb_streams)
 }
diff --git a/format_context_test.go b/format_context_test.go
index 156964a..79ba427 100644
--- a/format_context_test.go
+++ b/format_context_test.go
@@ -58,6 +58,16 @@ func TestFormatContext(t *testing.T) {
 	require.NotNil(t, s3)
 	require.Equal(t, 1, s3.Index())
 
+	d := NewDictionary()
+	d.Set("k", "v", 0)
+	fc3.SetMetadata(d)
+	e := fc3.Metadata().Get("k", nil, 0)
+	require.NotNil(t, e)
+	require.Equal(t, "v", e.Value())
+
+	fc3.SetMetadata(nil)
+	require.Nil(t, fc3.Metadata())
+
 	fc4 := AllocFormatContext()
 	require.NotNil(t, fc4)
 	defer fc4.Free()