diff --git a/libavformat/mmf.c b/libavformat/mmf.c
index 84c4ef7146..61f1d7adf4 100644
--- a/libavformat/mmf.c
+++ b/libavformat/mmf.c
@@ -83,7 +83,10 @@ static int mmf_write_header(AVFormatContext *s)
     avio_w8(pb, 0); /* code type */
     avio_w8(pb, 0); /* status */
     avio_w8(pb, 0); /* counts */
-    avio_write(pb, "VN:libavcodec,", sizeof("VN:libavcodec,") - 1); /* metadata ("ST:songtitle,VN:version,...") */
+    end_tag_be(pb, pos);
+
+    pos = ff_start_tag(pb, "OPDA");
+    avio_write(pb, "VN:libavcodec,", sizeof("VN:libavcodec,") -1); /* metadata ("ST:songtitle,VN:version,...") */
     end_tag_be(pb, pos);
 
     avio_write(pb, "ATR\x00", 4);