diff --git a/apps/openmw/mwgui/hud.cpp b/apps/openmw/mwgui/hud.cpp
index a78b1a6d1b..8ef5e59d08 100644
--- a/apps/openmw/mwgui/hud.cpp
+++ b/apps/openmw/mwgui/hud.cpp
@@ -55,6 +55,8 @@ namespace MWGui
         , mWorldMouseOver(false)
         , mEnemyHealthTimer(0)
         , mIsDrowning(false)
+        , mWeaponSpellTimer(0.f)
+        , mDrowningFlashTheta(0.f)
     {
         setCoord(0,0, width, height);
 
diff --git a/apps/openmw/mwgui/messagebox.cpp b/apps/openmw/mwgui/messagebox.cpp
index 6718455523..378e76e467 100644
--- a/apps/openmw/mwgui/messagebox.cpp
+++ b/apps/openmw/mwgui/messagebox.cpp
@@ -16,6 +16,15 @@ namespace MWGui
         mLastButtonPressed = -1;
     }
 
+    MessageBoxManager::~MessageBoxManager ()
+    {
+        std::vector<MessageBox*>::iterator it(mMessageBoxes.begin());
+        for (; it != mMessageBoxes.end(); ++it)
+        {
+            delete *it;
+        }
+    }
+
     void MessageBoxManager::onFrame (float frameDuration)
     {
         std::vector<MessageBox*>::iterator it;
diff --git a/apps/openmw/mwgui/messagebox.hpp b/apps/openmw/mwgui/messagebox.hpp
index aac4704fa9..0288f366ce 100644
--- a/apps/openmw/mwgui/messagebox.hpp
+++ b/apps/openmw/mwgui/messagebox.hpp
@@ -23,6 +23,7 @@ namespace MWGui
     {
         public:
             MessageBoxManager ();
+            ~MessageBoxManager ();
             void onFrame (float frameDuration);
             void createMessageBox (const std::string& message, bool stat = false);
             void removeStaticMessageBox ();
diff --git a/apps/openmw/mwgui/windowmanagerimp.cpp b/apps/openmw/mwgui/windowmanagerimp.cpp
index 8818721f43..627c542f2a 100644
--- a/apps/openmw/mwgui/windowmanagerimp.cpp
+++ b/apps/openmw/mwgui/windowmanagerimp.cpp
@@ -322,6 +322,7 @@ namespace MWGui
         delete mSoulgemDialog;
         delete mCursorManager;
         delete mRecharge;
+        delete mCompanionWindow;
 
         cleanupGarbage();
 
diff --git a/apps/openmw/mwrender/videoplayer.cpp b/apps/openmw/mwrender/videoplayer.cpp
index 88bc6d8ac2..74b52c06bd 100644
--- a/apps/openmw/mwrender/videoplayer.cpp
+++ b/apps/openmw/mwrender/videoplayer.cpp
@@ -950,8 +950,22 @@ void VideoState::init(const std::string& resourceName)
 
     // Open video file
     /// \todo leak here, ffmpeg or valgrind bug ?
+    ///
+    /// https://trac.ffmpeg.org/ticket/1357
+    ///
     if(!this->format_ctx || avformat_open_input(&this->format_ctx, resourceName.c_str(), NULL, NULL))
     {
+        if (this->format_ctx != NULL)
+        {
+          if (this->format_ctx->pb != NULL)
+          {
+              av_free(this->format_ctx->pb->buffer);
+              this->format_ctx->pb->buffer = NULL;
+
+              av_free(this->format_ctx->pb);
+              this->format_ctx->pb = NULL;
+          }
+        }
         // "Note that a user-supplied AVFormatContext will be freed on failure."
         this->format_ctx = NULL;
         av_free(ioCtx);
@@ -1009,9 +1023,20 @@ void VideoState::deinit()
 
     if(this->format_ctx)
     {
-        AVIOContext *ioContext = this->format_ctx->pb;
+        // valgrind shows memleak near format_ctx->pb
+        //
+        // As scrawl pointed, memleak could be related to this ffmpeg ticket:
+        // https://trac.ffmpeg.org/ticket/1357
+        //
+        if (this->format_ctx->pb != NULL)
+        {
+            av_free(this->format_ctx->pb->buffer);
+            this->format_ctx->pb->buffer = NULL;
+
+            av_free(this->format_ctx->pb);
+            this->format_ctx->pb = NULL;;
+        }
         avformat_close_input(&this->format_ctx);
-        av_free(ioContext);
     }
 }