From 7e3d7677aeacd3e15727c0796f8943d2301960de Mon Sep 17 00:00:00 2001
From: Alexander Stohr <alexander.stohr@gmx.de>
Date: Wed, 22 Jul 2015 11:11:58 +0200
Subject: [PATCH] not only print file-not-found as a warning but also print the
 name of the problematic file and the uri used for the open attempt

---
 modules/videoio/src/cap_ffmpeg_impl.hpp | 1 +
 modules/videoio/src/cap_gstreamer.cpp   | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/modules/videoio/src/cap_ffmpeg_impl.hpp b/modules/videoio/src/cap_ffmpeg_impl.hpp
index f95c5e849..2615f3a49 100644
--- a/modules/videoio/src/cap_ffmpeg_impl.hpp
+++ b/modules/videoio/src/cap_ffmpeg_impl.hpp
@@ -586,6 +586,7 @@ bool CvCapture_FFMPEG::open( const char* _filename )
     if (err < 0)
     {
         CV_WARN("Error opening file");
+        CV_WARN(_filename);
         goto exit_func;
     }
     err =
diff --git a/modules/videoio/src/cap_gstreamer.cpp b/modules/videoio/src/cap_gstreamer.cpp
index 62a18b5a7..4740126c0 100644
--- a/modules/videoio/src/cap_gstreamer.cpp
+++ b/modules/videoio/src/cap_gstreamer.cpp
@@ -601,6 +601,8 @@ bool CvCapture_GStreamer::open( int type, const char* filename )
             else
             {
                 CV_WARN("GStreamer: Error opening file\n");
+                CV_WARN(filename);
+                CV_WARN(uri);
                 close();
                 return false;
             }