From d270fa498c49a6a1a2454e7f984247d735ee179b Mon Sep 17 00:00:00 2001
From: Jan Schmidt <jan@centricular.com>
Date: Fri, 2 Jul 2021 01:41:05 +1000
Subject: [PATCH] matroskamux: Always write a tags element into seekhead

If there are only stream tags, we still want to write the
tags entry into the seekhead, so that tags can be found
quickly in the player.

Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/issues/905

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/1020>
---
 gst/matroska/matroska-mux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gst/matroska/matroska-mux.c b/gst/matroska/matroska-mux.c
index 48f24fd3a9..1d003b488c 100644
--- a/gst/matroska/matroska-mux.c
+++ b/gst/matroska/matroska-mux.c
@@ -3593,7 +3593,7 @@ gst_matroska_mux_finish (GstMatroskaMux * mux)
     gst_ebml_write_seek (ebml, my_pos);
   }
 
-  if (tags != NULL || toc_has_tags) {
+  if (mux->tags_pos != 0 || toc_has_tags) {
     gst_ebml_replace_uint (ebml, mux->seekhead_pos + 144,
         mux->tags_pos - mux->segment_master);
   } else {
-- 
2.34.1