---
 libavformat/mux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mux.c b/libavformat/mux.c
index 9aee224..2a28fd6 100644
--- a/libavformat/mux.c
+++ b/libavformat/mux.c
@@ -624,7 +624,7 @@ int av_write_trailer(AVFormatContext *s)
     if (s->oformat->write_trailer)
         ret = s->oformat->write_trailer(s);
 
-    if (!(s->oformat->flags & AVFMT_NOFILE))
+    if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)
         avio_flush(s->pb);
 
 fail:
-- 
1.9.3 (Apple Git-50)

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