From 2a9521661ed92de44f6206486d45dd91e5e43710 Mon Sep 17 00:00:00 2001
From: Maksim Shabunin <maksim.shabunin@gmail.com>
Date: Tue, 9 Jul 2019 14:08:29 +0300
Subject: [PATCH] Fixed video writer filename check for plugins

---
 modules/videoio/src/backend_plugin.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/videoio/src/backend_plugin.cpp b/modules/videoio/src/backend_plugin.cpp
index 17f7a1de4e..71f79c16db 100644
--- a/modules/videoio/src/backend_plugin.cpp
+++ b/modules/videoio/src/backend_plugin.cpp
@@ -480,7 +480,8 @@ public:
         if (plugin_api->Writer_open)
         {
             CV_Assert(plugin_api->Writer_release);
-            if (CV_ERROR_OK == plugin_api->Writer_open(filename.empty() ? 0 : filename.c_str(), fourcc, fps, sz.width, sz.height, isColor, &writer))
+            CV_Assert(!filename.empty());
+            if (CV_ERROR_OK == plugin_api->Writer_open(filename.c_str(), fourcc, fps, sz.width, sz.height, isColor, &writer))
             {
                 CV_Assert(writer);
                 return makePtr<PluginWriter>(plugin_api, writer);