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Git pushed a commit to branch release/6.1
in repository ffmpeg.

The following commit(s) were added to refs/heads/release/6.1 by this push:
     new d46603a497 avformat/mux: don't let positive write_trailer ret shadow 
pb failure
d46603a497 is described below

commit d46603a49708def4a226640cae99b0f724f04de8
Author:     Timo Rothenpieler <[email protected]>
AuthorDate: Thu Sep 24 14:21:41 2026 +0200
Commit:     ffmpeg-devel <[email protected]>
CommitDate: Tue Sep 29 19:25:29 2026 +0000

    avformat/mux: don't let positive write_trailer ret shadow pb failure
    
    (cherry picked from commit 1de217ad4b98163b7f5a372853b1c943ed6f070d)
---
 libavformat/avformat.h | 2 +-
 libavformat/mux.c      | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 9e7eca007e..3007c1f52e 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -2418,7 +2418,7 @@ int av_write_uncoded_frame_query(AVFormatContext *s, int 
stream_index);
  * May only be called after a successful call to avformat_write_header.
  *
  * @param s media file handle
- * @return 0 if OK, AVERROR_xxx on error
+ * @return >=0 if OK, AVERROR_xxx on error
  */
 int av_write_trailer(AVFormatContext *s);
 
diff --git a/libavformat/mux.c b/libavformat/mux.c
index c7877c5d98..6d92acccd5 100644
--- a/libavformat/mux.c
+++ b/libavformat/mux.c
@@ -1321,8 +1321,8 @@ int av_write_trailer(AVFormatContext *s)
 
     if (s->pb)
        avio_flush(s->pb);
-    if (ret == 0)
-       ret = s->pb ? s->pb->error : 0;
+    if (ret >= 0 && s->pb && s->pb->error < 0)
+       ret = s->pb->error;
     for (unsigned i = 0; i < s->nb_streams; i++) {
         av_freep(&s->streams[i]->priv_data);
         av_freep(&ffstream(s->streams[i])->index_entries);

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