Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com>
---
 libavformat/mux.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavformat/mux.c b/libavformat/mux.c
index fff8094341..0cf9ebfc19 100644
--- a/libavformat/mux.c
+++ b/libavformat/mux.c
@@ -464,9 +464,9 @@ int avformat_write_header(AVFormatContext *s, AVDictionary 
**options)
         if ((ret = avformat_init_output(s, options)) < 0)
             return ret;
 
-    if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)
-        avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_HEADER);
     if (ffofmt(s->oformat)->write_header) {
+        if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)
+            avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_HEADER);
         ret = ffofmt(s->oformat)->write_header(s);
         if (ret >= 0 && s->pb && s->pb->error < 0)
             ret = s->pb->error;
-- 
2.34.1

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