Since the pointer `oc' is NULL, oc->oformat->name will cause a null
pointer dereference.  This patch changes it to seg->oformat->name.

Signed-off-by: Xi Wang <[email protected]>
---
 libavformat/segment.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/segment.c b/libavformat/segment.c
index fd52835..8afb41f 100644
--- a/libavformat/segment.c
+++ b/libavformat/segment.c
@@ -210,7 +210,7 @@ static int seg_write_header(AVFormatContext *s)
     }
     if (seg->oformat->flags & AVFMT_NOFILE) {
         av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
-               oc->oformat->name);
+               seg->oformat->name);
         ret = AVERROR(EINVAL);
         goto fail;
     }
-- 
1.7.10.4

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