Fixed video writer filename check for plugins

mshabunin · mshabunin · commit 693877212d34 · 2019-07-09T14:08:29.000+03:00
diff --git a/modules/videoio/src/backend_plugin.cpp b/modules/videoio/src/backend_plugin.cpp
@@ -480,7 +480,8 @@ class PluginWriter : public cv::IVideoWriter
         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);

Original file line number	Diff line number	Diff line change
`@@ -480,7 +480,8 @@ class PluginWriter : public cv::IVideoWriter`
`480`	`480`	`if (plugin_api->Writer_open)`
`481`	`481`	`{`
`482`	`482`	`CV_Assert(plugin_api->Writer_release);`
`483`		`- if (CV_ERROR_OK == plugin_api->Writer_open(filename.empty() ? 0 : filename.c_str(), fourcc, fps, sz.width, sz.height, isColor, &writer))`
	`483`	`+ CV_Assert(!filename.empty());`
	`484`	`+ if (CV_ERROR_OK == plugin_api->Writer_open(filename.c_str(), fourcc, fps, sz.width, sz.height, isColor, &writer))`
`484`	`485`	`{`
`485`	`486`	`CV_Assert(writer);`
`486`	`487`	`return makePtr<PluginWriter>(plugin_api, writer);`