From c62d1780fff8a1997dd1707bbc557efc8fe41e3c Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sun, 13 Dec 2015 02:28:13 +0100
Subject: [PATCH] avformat/hlsenc: Check the return code of
 avformat_write_header()

Fixes: segfault
Fixes: Ticket5067

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/hlsenc.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
index 3181cc7e36..adcf7dfcdd 100644
--- a/libavformat/hlsenc.c
+++ b/libavformat/hlsenc.c
@@ -571,8 +571,11 @@ static int hls_start(AVFormatContext *s)
         av_opt_set(oc->priv_data, "pat_period", period, 0);
     }
 
-    if (c->vtt_basename)
-        avformat_write_header(vtt_oc,NULL);
+    if (c->vtt_basename) {
+        err = avformat_write_header(vtt_oc,NULL);
+        if (err < 0)
+            return err;
+    }
 
     return 0;
 fail: