[opencv] 10/71: fixed -Wunused-result warning

[Nobuhiro Iwamatsu]

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iwamatsu pushed a commit to annotated tag 2.4.13.1
in repository opencv.

commit e0d64df76351f97c1dea5babb09954afbaea63a7
Author: Ilya Lavrenov <ilya.lavrenov at itseez.com>
Date:   Thu Jun 16 12:53:59 2016 +0300

    fixed -Wunused-result warning
---
 modules/highgui/src/cap_ffmpeg_impl.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/highgui/src/cap_ffmpeg_impl.hpp b/modules/highgui/src/cap_ffmpeg_impl.hpp
index dc3e10d..da05bde 100644
--- a/modules/highgui/src/cap_ffmpeg_impl.hpp
+++ b/modules/highgui/src/cap_ffmpeg_impl.hpp
@@ -2287,7 +2287,8 @@ bool OutputMediaStream_FFMPEG::open(const char* fileName, int width, int height,
     #if LIBAVFORMAT_BUILD < CALC_FFMPEG_VERSION(53, 2, 0)
         av_write_header(oc_);
     #else
-        avformat_write_header(oc_, NULL);
+        if (avformat_write_header(oc_, NULL) != 0)
+            return false;
     #endif
 
     return true;

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