From 8b0e1c7fcb6814acbcddb6f9effb4a1799952488 Mon Sep 17 00:00:00 2001
From: Peter Jozsa <peter.jozsa@prezi.com>
Date: Mon, 3 Sep 2018 14:56:38 +0200
Subject: [PATCH] Fix https://github.com/opencv/opencv/issues/12301

---
 modules/videoio/src/cap_msmf.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/modules/videoio/src/cap_msmf.cpp b/modules/videoio/src/cap_msmf.cpp
index 863f46bc89..a540238d23 100644
--- a/modules/videoio/src/cap_msmf.cpp
+++ b/modules/videoio/src/cap_msmf.cpp
@@ -616,7 +616,7 @@ class SourceReaderCB : public IMFSourceReaderCallback
 {
 public:
     SourceReaderCB() :
-        m_nRefCount(1), m_hEvent(CreateEvent(NULL, FALSE, FALSE, NULL)), m_bEOS(FALSE), m_hrStatus(S_OK), m_dwStreamIndex(0)
+        m_nRefCount(0), m_hEvent(CreateEvent(NULL, FALSE, FALSE, NULL)), m_bEOS(FALSE), m_hrStatus(S_OK), m_reader(NULL), m_dwStreamIndex(0)
     {
     }
 
@@ -677,7 +677,7 @@ public:
     BOOL                m_bEOS;
     HRESULT             m_hrStatus;
 
-    _ComPtr<IMFSourceReader> m_reader;
+    IMFSourceReader *m_reader;
     DWORD m_dwStreamIndex;
     _ComPtr<IMFSample>  m_lastSample;
 };
@@ -1140,7 +1140,7 @@ bool CvCapture_MSMF::grabFrame()
         if (!reader->m_reader)
         {
             // Initiate capturing with async callback
-            reader->m_reader = videoFileSource;
+            reader->m_reader = videoFileSource.Get();
             reader->m_dwStreamIndex = dwStreamIndex;
             if (FAILED(hr = videoFileSource->ReadSample(dwStreamIndex, 0, NULL, NULL, NULL, NULL)))
             {