From 21211308d0afec717f987b7d08bfa8fa391514a4 Mon Sep 17 00:00:00 2001
From: Nikita Manovich <nikita.manovich@gmail.com>
Date: Wed, 10 Jul 2013 17:43:47 +0400
Subject: [PATCH] Fixed VideoCapture::open() does not release previous capture
 sources (Bug #3150).

VideoCapture didn't call release method and just ignored the new capture sources.
OpenCV documentation:
  bool VideoCapture::open(const string& filename);
  bool VideoCapture::open(int device);

The methods first call VideoCapture::release() to close the already opened file or camera.
---
 modules/highgui/src/cap.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/modules/highgui/src/cap.cpp b/modules/highgui/src/cap.cpp
index a76cb428eae0..ac3d658dc76e 100644
--- a/modules/highgui/src/cap.cpp
+++ b/modules/highgui/src/cap.cpp
@@ -490,14 +490,14 @@ VideoCapture::~VideoCapture()
 
 bool VideoCapture::open(const String& filename)
 {
-    if (!isOpened())
+    if (isOpened()) release();
     cap = cvCreateFileCapture(filename.c_str());
     return isOpened();
 }
 
 bool VideoCapture::open(int device)
 {
-    if (!isOpened())
+    if (isOpened()) release();
     cap = cvCreateCameraCapture(device);
     return isOpened();
 }