From d8171750cdaab29068bc2affd5864b68cc4c0499 Mon Sep 17 00:00:00 2001
From: Isaac <isaac@localhost>
Date: Fri, 6 Apr 2018 23:02:15 +0200
Subject: [PATCH] only call avformat_close_input if mformatContext still has a
 value.  On falure it should have been freed and NULL'd

---
 src/zm_ffmpeg_camera.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/zm_ffmpeg_camera.cpp b/src/zm_ffmpeg_camera.cpp
index 0d5e70480..bd033fee6 100644
--- a/src/zm_ffmpeg_camera.cpp
+++ b/src/zm_ffmpeg_camera.cpp
@@ -362,9 +362,11 @@ int FfmpegCamera::OpenFfmpeg() {
 #if !LIBAVFORMAT_VERSION_CHECK(53, 17, 0, 25, 0)
     av_close_input_file( mFormatContext );
 #else
-    avformat_close_input( &mFormatContext );
+    if ( mFormatContext ) {
+      avformat_close_input( &mFormatContext );
+      mFormatContext = NULL;
+    }
 #endif
-    mFormatContext = NULL;
     av_dict_free(&opts);
 
     return -1;