diff --git a/apps/openmw/mwgui/hud.cpp b/apps/openmw/mwgui/hud.cpp
index a78b1a6d1..8ef5e59d0 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 671845552..378e76e46 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 aac4704fa..0288f366c 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 3d65a56ee..90ced66d3 100644
--- a/apps/openmw/mwgui/windowmanagerimp.cpp
+++ b/apps/openmw/mwgui/windowmanagerimp.cpp
@@ -323,6 +323,7 @@ namespace MWGui
         delete mSoulgemDialog;
         delete mCursorManager;
         delete mRecharge;
+        delete mCompanionWindow;
 
         cleanupGarbage();
 
diff --git a/apps/openmw/mwmechanics/actors.cpp b/apps/openmw/mwmechanics/actors.cpp
index 62242ee8c..5b51c0600 100644
--- a/apps/openmw/mwmechanics/actors.cpp
+++ b/apps/openmw/mwmechanics/actors.cpp
@@ -537,6 +537,16 @@ namespace MWMechanics
 
     Actors::Actors() {}
 
+    Actors::~Actors()
+    {
+      PtrControllerMap::iterator it(mActors.begin());
+      for (; it != mActors.end(); ++it)
+      {
+        delete it->second;
+        it->second = NULL;
+      }
+    }
+
     void Actors::addActor (const MWWorld::Ptr& ptr)
     {
         // erase previous death events since we are currently only tracking them while in an active cell
diff --git a/apps/openmw/mwmechanics/actors.hpp b/apps/openmw/mwmechanics/actors.hpp
index b03b68e89..83aff63e3 100644
--- a/apps/openmw/mwmechanics/actors.hpp
+++ b/apps/openmw/mwmechanics/actors.hpp
@@ -48,6 +48,7 @@ namespace MWMechanics
         public:
 
             Actors();
+            ~Actors();
 
             /// Update magic effects for an actor. Usually done automatically once per frame, but if we're currently
             /// paused we may want to do it manually (after equipping permanent enchantment)
diff --git a/apps/openmw/mwmechanics/objects.cpp b/apps/openmw/mwmechanics/objects.cpp
index 694987855..41d6b4ffa 100644
--- a/apps/openmw/mwmechanics/objects.cpp
+++ b/apps/openmw/mwmechanics/objects.cpp
@@ -14,6 +14,16 @@ Objects::Objects()
 {
 }
 
+Objects::~Objects()
+{
+  PtrControllerMap::iterator it(mObjects.begin());
+  for (; it != mObjects.end();++it)
+  {
+    delete it->second;
+    it->second = NULL;
+  }
+}
+
 void Objects::addObject(const MWWorld::Ptr& ptr)
 {
     removeObject(ptr);
diff --git a/apps/openmw/mwmechanics/objects.hpp b/apps/openmw/mwmechanics/objects.hpp
index 5cdcdaa0a..32432c130 100644
--- a/apps/openmw/mwmechanics/objects.hpp
+++ b/apps/openmw/mwmechanics/objects.hpp
@@ -21,6 +21,7 @@ namespace MWMechanics
 
     public:
         Objects();
+        ~Objects();
 
         void addObject (const MWWorld::Ptr& ptr);
         ///< Register an animated object
diff --git a/apps/openmw/mwrender/camera.cpp b/apps/openmw/mwrender/camera.cpp
index 8f54be3f8..bf71505bc 100644
--- a/apps/openmw/mwrender/camera.cpp
+++ b/apps/openmw/mwrender/camera.cpp
@@ -19,25 +19,27 @@ namespace MWRender
     Camera::Camera (Ogre::Camera *camera)
     : mCamera(camera),
       mCameraNode(NULL),
+      mAnimation(NULL),
       mFirstPersonView(true),
       mPreviewMode(false),
       mFreeLook(true),
-      mHeight(128.f),
-      mCameraDistance(300.f),
-      mDistanceAdjusted(false),
-      mAnimation(NULL),
       mNearest(30.f),
       mFurthest(800.f),
       mIsNearest(false),
       mIsFurthest(false),
+      mHeight(128.f),
+      mCameraDistance(300.f),
+      mDistanceAdjusted(false),
       mVanityToggleQueued(false),
       mViewModeToggleQueued(false)
     {
         mVanity.enabled = false;
         mVanity.allowed = true;
 
+        mPreviewCam.pitch = 0.f;
         mPreviewCam.yaw = 0.f;
         mPreviewCam.offset = 400.f;
+        mMainCam.pitch = 0.f;
         mMainCam.yaw = 0.f;
         mMainCam.offset = 400.f;
     }
diff --git a/apps/openmw/mwrender/videoplayer.cpp b/apps/openmw/mwrender/videoplayer.cpp
index 88bc6d8ac..adf20dc63 100644
--- a/apps/openmw/mwrender/videoplayer.cpp
+++ b/apps/openmw/mwrender/videoplayer.cpp
@@ -949,9 +949,25 @@ void VideoState::init(const std::string& resourceName)
         this->format_ctx->pb = ioCtx;
 
     // Open video file
-    /// \todo leak here, ffmpeg or valgrind bug ?
+    ///
+    /// format_ctx->pb->buffer must be freed by hand,
+    /// if not, valgrind will show memleak, see:
+    ///
+    /// 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 +1025,21 @@ void VideoState::deinit()
 
     if(this->format_ctx)
     {
-        AVIOContext *ioContext = this->format_ctx->pb;
+        ///
+        /// format_ctx->pb->buffer must be freed by hand,
+        /// if not, valgrind will show memleak, see:
+        ///
+        /// 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);
     }
 }
 
diff --git a/apps/openmw/mwrender/water.cpp b/apps/openmw/mwrender/water.cpp
index 082551f37..0a4db30e9 100644
--- a/apps/openmw/mwrender/water.cpp
+++ b/apps/openmw/mwrender/water.cpp
@@ -292,6 +292,7 @@ Water::~Water()
 
     delete mReflection;
     delete mRefraction;
+    delete mSimulation;
 }
 
 void Water::changeCell(const ESM::Cell* cell)
diff --git a/apps/openmw/mwscript/docs/vmformat.txt b/apps/openmw/mwscript/docs/vmformat.txt
index 9e024f872..cf533451c 100644
--- a/apps/openmw/mwscript/docs/vmformat.txt
+++ b/apps/openmw/mwscript/docs/vmformat.txt
@@ -127,7 +127,6 @@ op 0x200007e-0x2000084: Enable Controls
 op 0x2000085-0x200008b: Disable Controls
 op 0x200008c: Unlock
 op 0x200008d: Unlock, explicit reference
-op 0x200008e: COE
 op 0x200008e-0x20000a8: GetSkill
 op 0x20000a9-0x20000c3: GetSkill, explicit reference
 op 0x20000c4-0x20000de: SetSkill
@@ -358,5 +357,6 @@ op 0x2000222: GetLineOfSight
 op 0x2000223: GetLineOfSightExplicit
 op 0x2000224: ToggleAI
 op 0x2000225: ToggleAIExplicit
+op 0x2000226: COE
 
-opcodes 0x2000226-0x3ffffff unused
+opcodes 0x2000227-0x3ffffff unused
diff --git a/apps/openmw/mwsound/ffmpeg_decoder.cpp b/apps/openmw/mwsound/ffmpeg_decoder.cpp
index d5c382a41..c83697442 100644
--- a/apps/openmw/mwsound/ffmpeg_decoder.cpp
+++ b/apps/openmw/mwsound/ffmpeg_decoder.cpp
@@ -158,6 +158,16 @@ void FFmpeg_Decoder::open(const std::string &fname)
     mFormatCtx->pb = avio_alloc_context(NULL, 0, 0, this, readPacket, writePacket, seek);
     if(!mFormatCtx->pb || avformat_open_input(&mFormatCtx, fname.c_str(), NULL, NULL) != 0)
     {
+        if (mFormatCtx->pb != NULL)
+        {
+          if (mFormatCtx->pb->buffer != NULL)
+          {
+            av_free(mFormatCtx->pb->buffer);
+            mFormatCtx->pb->buffer = NULL;
+          }
+          av_free(mFormatCtx->pb);
+          mFormatCtx->pb = NULL;
+        }
         avformat_free_context(mFormatCtx);
         mFormatCtx = NULL;
         fail("Failed to allocate input stream");
@@ -195,6 +205,14 @@ void FFmpeg_Decoder::open(const std::string &fname)
     }
     catch(std::exception &e)
     {
+        if (mFormatCtx->pb->buffer != NULL)
+        {
+          av_free(mFormatCtx->pb->buffer);
+          mFormatCtx->pb->buffer = NULL;
+        }
+        av_free(mFormatCtx->pb);
+        mFormatCtx->pb = NULL;
+
         avformat_close_input(&mFormatCtx);
         throw;
     }
@@ -211,9 +229,22 @@ void FFmpeg_Decoder::close()
 
     if(mFormatCtx)
     {
-        AVIOContext* context = mFormatCtx->pb;
+        if (mFormatCtx->pb != NULL)
+        {
+          // mFormatCtx->pb->buffer must be freed by hand,
+          // if not, valgrind will show memleak, see:
+          //
+          // https://trac.ffmpeg.org/ticket/1357
+          //
+          if (mFormatCtx->pb->buffer != NULL)
+          {
+            av_free(mFormatCtx->pb->buffer);
+            mFormatCtx->pb->buffer = NULL;
+          }
+          av_free(mFormatCtx->pb);
+          mFormatCtx->pb = NULL;
+        }
         avformat_close_input(&mFormatCtx);
-        av_free(context);
     }
 
     mDataStream.setNull();
diff --git a/components/compiler/opcodes.hpp b/components/compiler/opcodes.hpp
index a885a373d..b7d44a851 100644
--- a/components/compiler/opcodes.hpp
+++ b/components/compiler/opcodes.hpp
@@ -25,7 +25,7 @@ namespace Compiler
         const int opcodeAiFollowExplicit = 0x20023;
         const int opcodeAiFollowCell = 0x20024;
         const int opcodeAiFollowCellExplicit = 0x20025;
-        const int opcodeSetHello = 0x200015e;
+        const int opcodeSetHello = 0x200015c;
         const int opcodeSetHelloExplicit = 0x200015d;
         const int opcodeSetFight = 0x200015e;
         const int opcodeSetFightExplicit = 0x200015f;
@@ -69,7 +69,7 @@ namespace Compiler
     {
         const int opcodeCellChanged = 0x2000000;
         const int opcodeCOC = 0x2000026;
-        const int opcodeCOE = 0x200008e;
+        const int opcodeCOE = 0x2000226;
         const int opcodeGetInterior = 0x2000131;
         const int opcodeGetPCCell = 0x2000136;
         const int opcodeGetWaterLevel = 0x2000141;
diff --git a/components/interpreter/interpreter.cpp b/components/interpreter/interpreter.cpp
index 10937e6bc..ea1e9fc91 100644
--- a/components/interpreter/interpreter.cpp
+++ b/components/interpreter/interpreter.cpp
@@ -166,31 +166,37 @@ namespace Interpreter
 
     void Interpreter::installSegment0 (int code, Opcode1 *opcode)
     {
+        assert(mSegment0.find(code) == mSegment0.end());
         mSegment0.insert (std::make_pair (code, opcode));
     }
 
     void Interpreter::installSegment1 (int code, Opcode2 *opcode)
     {
+        assert(mSegment1.find(code) == mSegment1.end());
         mSegment1.insert (std::make_pair (code, opcode));
     }
 
     void Interpreter::installSegment2 (int code, Opcode1 *opcode)
     {
+        assert(mSegment2.find(code) == mSegment2.end());
         mSegment2.insert (std::make_pair (code, opcode));
     }
 
     void Interpreter::installSegment3 (int code, Opcode1 *opcode)
     {
+        assert(mSegment3.find(code) == mSegment3.end());
         mSegment3.insert (std::make_pair (code, opcode));
     }
 
     void Interpreter::installSegment4 (int code, Opcode2 *opcode)
     {
+        assert(mSegment4.find(code) == mSegment4.end());
         mSegment4.insert (std::make_pair (code, opcode));
     }
 
     void Interpreter::installSegment5 (int code, Opcode0 *opcode)
     {
+        assert(mSegment5.find(code) == mSegment5.end());
         mSegment5.insert (std::make_pair (code, opcode));
     }
 
diff --git a/components/terrain/quadtreenode.cpp b/components/terrain/quadtreenode.cpp
index e16ae55dd..02225cb02 100644
--- a/components/terrain/quadtreenode.cpp
+++ b/components/terrain/quadtreenode.cpp
@@ -140,17 +140,19 @@ namespace
 }
 
 QuadTreeNode::QuadTreeNode(World* terrain, ChildDirection dir, float size, const Ogre::Vector2 &center, QuadTreeNode* parent)
-    : mSize(size)
-    , mCenter(center)
-    , mParent(parent)
-    , mDirection(dir)
+    : mMaterialGenerator(NULL)
+    , mIsActive(false)
     , mIsDummy(false)
-    , mSceneNode(NULL)
-    , mTerrain(terrain)
-    , mChunk(NULL)
-    , mMaterialGenerator(NULL)
+    , mSize(size)
+    , mLodLevel(Log2(mSize))
     , mBounds(Ogre::AxisAlignedBox::BOX_NULL)
     , mWorldBounds(Ogre::AxisAlignedBox::BOX_NULL)
+    , mDirection(dir)
+    , mCenter(center)
+    , mSceneNode(NULL)
+    , mParent(parent)
+    , mTerrain(terrain)
+    , mChunk(NULL)
 {
     mBounds.setNull();
     for (int i=0; i<4; ++i)
@@ -168,8 +170,6 @@ QuadTreeNode::QuadTreeNode(World* terrain, ChildDirection dir, float size, const
     pos = mCenter - pos;
     mSceneNode->setPosition(Ogre::Vector3(pos.x*8192, pos.y*8192, 0));
 
-    mLodLevel = Log2(mSize);
-
     mMaterialGenerator = new MaterialGenerator(mTerrain->getShadersEnabled());
 }
 
diff --git a/libs/openengine/ogre/renderer.hpp b/libs/openengine/ogre/renderer.hpp
index f45f09b01..767e7cf99 100644
--- a/libs/openengine/ogre/renderer.hpp
+++ b/libs/openengine/ogre/renderer.hpp
@@ -74,8 +74,9 @@ namespace OEngine
             , mScene(NULL)
             , mCamera(NULL)
             , mView(NULL)
-            , mWindowListener(NULL)
+            , mOgreInit(NULL)
             , mFader(NULL)
+            , mWindowListener(NULL)
             {
             }