1 files changed, 3 insertions, 0 deletions
diff --git a/libavformat/asfenc.c b/libavformat/asfenc.c
index 8d169f7e2e..82681d24f1 100644
--- a/libavformat/asfenc.c
+++ b/libavformat/asfenc.c
@@ -579,6 +579,9 @@ static int asf_write_header(AVFormatContext *s)
     ffio_init_context(&asf->pb, asf->packet_buf, s->packet_size, 1,
                   NULL, NULL, NULL, NULL);
 
+    if (s->avoid_negative_ts < 0)
+        s->avoid_negative_ts = 1;
+
     return 0;
 }