diff --git a/CMakeLists.txt b/CMakeLists.txt
index ea744ae..8aaa4ed 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -45,11 +45,12 @@ SET( CMAKE_CXX_FLAGS "" )
 ######################################################################################
 # Variables
 ######################################################################################
-ADD_OPTION(USE_WERROR        "Warnings as errors"       OFF )
-ADD_OPTION(USE_QT4           "Build with QT4"           OFF )
-ADD_OPTION(USE_OPENCV        "Add OpenCV support"       OFF )
-ADD_OPTION(USE_PIXFC         "Add PIXFC support"        OFF )
-ADD_OPTION(USE_FFMPEG        "Add FFMPEG support"       OFF )
+ADD_OPTION(PLAYUVER_WERROR              "Warnings as errors"       OFF )
+ADD_OPTION(PLAYUVER_THREADED_MODULES    "Warnings as errors"       ON  )
+ADD_OPTION(USE_QT4                      "Build with QT4"           OFF )
+ADD_OPTION(USE_OPENCV                   "Add OpenCV support"       OFF )
+ADD_OPTION(USE_PIXFC                    "Add PIXFC support"        OFF )
+ADD_OPTION(USE_FFMPEG                   "Add FFMPEG support"       OFF )
 
 ######################################################################################
 # Dependencies
@@ -103,7 +104,7 @@ SET( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall" )
 SET( CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -g" )
 SET( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3" )
 
-IF( USE_WERROR )
+IF( PLAYUVER_WERROR )
   SET( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror" )
 ENDIF()
 
diff --git a/config.h.in b/config.h.in
index b7bf1c6..13bc617 100644
--- a/config.h.in
+++ b/config.h.in
@@ -36,6 +36,8 @@
   #define QT_VERSION_PLAYUVER 4
 #endif
 
+#cmakedefine PLAYUVER_THREADED_MODULES
+
 /* OpenCV */
 #cmakedefine USE_OPENCV
 
diff --git a/source/app/ModulesHandle.cpp b/source/app/ModulesHandle.cpp
index ce1f8af..f8c8a70 100644
--- a/source/app/ModulesHandle.cpp
+++ b/source/app/ModulesHandle.cpp
@@ -74,7 +74,6 @@ SubWindowHandle* ModulesHandle::processModuleHandlingOpt()
     else
     {
       destroyModuleIf( pcCurrModuleIf );
-      return NULL;
     }
   }
   else
@@ -154,6 +153,8 @@ SubWindowHandle* ModulesHandle::enableModuleIf( PlaYUVerModuleIf *pcCurrModuleIf
   {
     pcCurrModuleIf->m_pcSubWindow[i]->enableModule( pcCurrModuleIf );
   }
+  applyModuleIf( pcCurrModuleIf, false );
+
   return interfaceChild;
 }
 
@@ -186,32 +187,18 @@ Void ModulesHandle::destroyAllModulesIf()
 
 Bool ModulesHandle::applyModuleIf( PlaYUVerModuleIf *pcCurrModuleIf, Bool isPlaying )
 {
-  PlaYUVerFrame* processedFrame = NULL;
   Bool bRet = false;
   if( !isPlaying || ( isPlaying && pcCurrModuleIf->m_cModuleDef.m_bApplyWhilePlaying ) )
   {
-    switch( pcCurrModuleIf->m_cModuleDef.m_uiNumberOfFrames )
-    {
-    case MODULE_REQUIRES_ONE_FRAME:
-      processedFrame = pcCurrModuleIf->process( pcCurrModuleIf->m_pcSubWindow[0]->getCurrFrame() );
-      break;
-    case MODULE_REQUIRES_TWO_FRAMES:
-      processedFrame = pcCurrModuleIf->process( pcCurrModuleIf->m_pcSubWindow[0]->getCurrFrame(), pcCurrModuleIf->m_pcSubWindow[1]->getCurrFrame() );
-      break;
-    case MODULE_REQUIRES_THREE_FRAMES:
-      processedFrame = pcCurrModuleIf->process( pcCurrModuleIf->m_pcSubWindow[0]->getCurrFrame(), pcCurrModuleIf->m_pcSubWindow[1]->getCurrFrame(),
-          pcCurrModuleIf->m_pcSubWindow[2]->getCurrFrame() );
-      break;
-    }
+#ifdef PLAYUVER_THREADED_MODULES
+    pcCurrModuleIf->start();
+#else
+    pcCurrModuleIf->run();
+#endif
     if( pcCurrModuleIf->m_pcDisplaySubWindow )
     {
-      pcCurrModuleIf->m_pcDisplaySubWindow->setCurrFrame( processedFrame );
       bRet = true;
     }
-    else
-    {
-      pcCurrModuleIf->m_pcSubWindow[0]->setCurrFrame( processedFrame );
-    }
   }
   else
   {
@@ -220,6 +207,21 @@ Bool ModulesHandle::applyModuleIf( PlaYUVerModuleIf *pcCurrModuleIf, Bool isPlay
   return bRet;
 }
 
+Bool ModulesHandle::showModuleIf( PlaYUVerModuleIf *pcCurrModuleIf, PlaYUVerFrame* processedFrame )
+{
+  Bool bRet = false;
+  if( pcCurrModuleIf->m_pcDisplaySubWindow )
+  {
+    pcCurrModuleIf->m_pcDisplaySubWindow->setCurrFrame( processedFrame );
+    bRet = true;
+  }
+  else
+  {
+    pcCurrModuleIf->m_pcSubWindow[0]->setCurrFrame( processedFrame );
+  }
+  return bRet;
+}
+
 Void ModulesHandle::swapModulesWindowsIf( PlaYUVerModuleIf *pcCurrModuleIf )
 {
   if( pcCurrModuleIf->m_cModuleDef.m_uiNumberOfFrames == MODULE_REQUIRES_TWO_FRAMES )
@@ -230,6 +232,19 @@ Void ModulesHandle::swapModulesWindowsIf( PlaYUVerModuleIf *pcCurrModuleIf )
   }
 }
 
+Void ModulesHandle::customEvent( QEvent *event )
+{
+  if( !event )
+  {
+    return;
+  }
+  PlaYUVerModuleIf::EventData *eventData = ( PlaYUVerModuleIf::EventData* )event;
+  if( eventData->m_bSuccess )
+  {
+    showModuleIf( eventData->m_pcModule, eventData->m_pcProcessedFrame );
+  }
+}
+
 QMenu* ModulesHandle::createMenus( QMenuBar *MainAppMenuBar )
 {
   PlaYUVerModuleIf* pcCurrModuleIf;
@@ -246,6 +261,7 @@ QMenu* ModulesHandle::createMenus( QMenuBar *MainAppMenuBar )
   for( Int i = 0; i < m_pcPlaYUVerModules.size(); i++ )
   {
     pcCurrModuleIf = m_pcPlaYUVerModules.at( i );
+    pcCurrModuleIf->setParent( this );
 
     currSubMenu = NULL;
     if( pcCurrModuleIf->m_cModuleDef.m_pchModuleCategory )
diff --git a/source/app/ModulesHandle.h b/source/app/ModulesHandle.h
index d22e032..d363f58 100644
--- a/source/app/ModulesHandle.h
+++ b/source/app/ModulesHandle.h
@@ -58,6 +58,7 @@ public:
   static Void destroyModuleIf( PlaYUVerModuleIf* pcCurrModuleIf );
   static Bool applyModuleIf( PlaYUVerModuleIf* pcCurrModuleIf, Bool isPlaying = false );
   static Void swapModulesWindowsIf( PlaYUVerModuleIf *pcCurrModuleIf );
+  static Bool showModuleIf( PlaYUVerModuleIf *pcCurrModuleIf, PlaYUVerFrame* processedFrame );
 
 private:
   QWidget *m_pcParent;
@@ -89,6 +90,7 @@ private:
 
   Void appendModule( PlaYUVerModuleIf* pcCurrModuleIf );
   SubWindowHandle* enableModuleIf( PlaYUVerModuleIf* pcCurrModuleIf );
+  Void customEvent( QEvent *event );
 
 private Q_SLOTS:
   void selectModule( int index );
diff --git a/source/app/PlaYUVerModuleIf.cpp b/source/app/PlaYUVerModuleIf.cpp
new file mode 100644
index 0000000..8d81381
--- /dev/null
+++ b/source/app/PlaYUVerModuleIf.cpp
@@ -0,0 +1,70 @@
+/*    This file is a part of plaYUVer project
+ *    Copyright (C) 2014  by Luis Lucas      (luisfrlucas@gmail.com)
+ *                           Joao Carreira   (jfmcarreira@gmail.com)
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License along
+ *   with this program; if not, write to the Free Software Foundation, Inc.,
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/**
+ * \file     PlaYUVerModuleIf.cpp
+ * \brief    PlaYUVer modules interface
+ */
+
+#include "PlaYUVerModuleIf.h"
+#include "SubWindowHandle.h"
+
+namespace plaYUVer
+{
+
+PlaYUVerModuleIf::PlaYUVerModuleIf() :
+        m_pcAction( NULL ),
+        m_pcDisplaySubWindow( NULL )
+{
+  for( Int i = 0; i < MAX_NUMBER_FRAMES; i++ )
+  {
+    m_pcSubWindow[i] = NULL;
+  }
+}
+
+void PlaYUVerModuleIf::run()
+{
+  PlaYUVerFrame* pcProcessedFrame;
+  switch( m_cModuleDef.m_uiNumberOfFrames )
+  {
+  case MODULE_REQUIRES_ONE_FRAME:
+    pcProcessedFrame = process( m_pcSubWindow[0]->getCurrFrame() );
+    break;
+  case MODULE_REQUIRES_TWO_FRAMES:
+    pcProcessedFrame = process( m_pcSubWindow[0]->getCurrFrame(), m_pcSubWindow[1]->getCurrFrame() );
+    break;
+  case MODULE_REQUIRES_THREE_FRAMES:
+    pcProcessedFrame = process( m_pcSubWindow[0]->getCurrFrame(), m_pcSubWindow[1]->getCurrFrame(), m_pcSubWindow[2]->getCurrFrame() );
+    break;
+  }
+  postProgress( true, pcProcessedFrame );
+}
+
+Void PlaYUVerModuleIf::postProgress( Bool success, PlaYUVerFrame* pcProcessedFrame )
+{
+  EventData *eventData = new EventData();
+  eventData->m_bSuccess = success;
+  eventData->m_pcProcessedFrame = pcProcessedFrame;
+  eventData->m_pcModule = this;
+  if( parent() )
+  QCoreApplication::postEvent( parent(), eventData );
+}
+
+}  // NAMESPACE
+
diff --git a/source/app/PlaYUVerModuleIf.h b/source/app/PlaYUVerModuleIf.h
index 28ceb52..55327ca 100644
--- a/source/app/PlaYUVerModuleIf.h
+++ b/source/app/PlaYUVerModuleIf.h
@@ -31,13 +31,12 @@
 #include <cstdio>
 #include "PlaYUVerFrame.h"
 
-class QImage;
 class QAction;
 
 namespace plaYUVer
 {
 
-enum __PlaYUVerModuleTypes
+enum // Module type
 {
   FRAME_LEVEL_MODULE,
   VIDEO_LEVEL_MODULE,
@@ -46,17 +45,15 @@ enum __PlaYUVerModuleTypes
 #define APPLY_WHILE_PLAYING true
 #define MAX_NUMBER_FRAMES 3
 
-enum __PlaYUVerModuleNumberOfFrames
+enum // Number of frames
 {
-  // Number of frames
   MODULE_REQUIRES_ONE_FRAME = 1,
   MODULE_REQUIRES_TWO_FRAMES = 2,
   MODULE_REQUIRES_THREE_FRAMES = 3,
 };
 
-enum __PlaYUVerModuleRequirements
+enum // Requirements
 {
-  // Requirements
   MODULE_REQUIRES_NOTHING = 0,
   MODULE_REQUIRES_NEW_WINDOW = 2,
   MODULE_REQUIRES_SIDEBAR = 4,
@@ -72,7 +69,7 @@ enum __PlaYUVerModuleRequirements
       }                                         \
     }
 
-typedef struct __PlaYUVerModuleDefinition
+typedef struct
 {
   Int m_iModuleType;
   const Char* m_pchModuleCategory;
@@ -86,36 +83,57 @@ typedef struct __PlaYUVerModuleDefinition
 class SubWindowHandle;
 
 class PlaYUVerModuleIf
+#ifdef PLAYUVER_THREADED_MODULES
+    : QThread
+#else
+    : QObject
+#endif
 {
   friend class ModulesHandle;
+
 private:
   QAction* m_pcAction;
   SubWindowHandle* m_pcSubWindow[MAX_NUMBER_FRAMES];
   SubWindowHandle* m_pcDisplaySubWindow;
   PlaYUVerModuleDefinition m_cModuleDef;
+
+  Void postProgress( Bool success, PlaYUVerFrame* pcProcessedFrame );
 public:
-  PlaYUVerModuleIf() :
-          m_pcAction( NULL ),
-          m_pcDisplaySubWindow( NULL )
+  class EventData: public QEvent
   {
-    for( Int i = 0; i < MAX_NUMBER_FRAMES; i++ )
+  public:
+    EventData() :
+            QEvent( QEvent::User )
     {
-      m_pcSubWindow[i] = NULL;
+      m_bSuccess = false;
+      m_pcProcessedFrame = NULL;
+      m_pcModule = NULL;
     }
-  }
-  virtual ~PlaYUVerModuleIf() { }
+    Bool m_bSuccess;
+    PlaYUVerFrame* m_pcProcessedFrame;
+    PlaYUVerModuleIf* m_pcModule;
+  };
 
-  virtual Void create()                 { }
-  virtual Void create( PlaYUVerFrame* ) { }
+  PlaYUVerModuleIf();
+  virtual ~PlaYUVerModuleIf() {}
 
-  virtual Void              process()                                                 {               }
-  virtual PlaYUVerFrame*    process( PlaYUVerFrame* )                                 { return NULL;  }
-  virtual PlaYUVerFrame*    process( PlaYUVerFrame*, PlaYUVerFrame* )                 { return NULL;  }
-  virtual PlaYUVerFrame*    process( PlaYUVerFrame*, PlaYUVerFrame*, PlaYUVerFrame* ) { return NULL;  }
 
-  virtual Void destroy(){ }
+  virtual Void create() {}
+  virtual Void create( PlaYUVerFrame* ) {}
 
-  Void setModuleDefinition( PlaYUVerModuleDefinition def )  { m_cModuleDef = def; }
+  virtual Void            process() {}
+  virtual PlaYUVerFrame*  process( PlaYUVerFrame* ) { return NULL; }
+  virtual PlaYUVerFrame*  process( PlaYUVerFrame*, PlaYUVerFrame* ) { return NULL; }
+  virtual PlaYUVerFrame*  process( PlaYUVerFrame*, PlaYUVerFrame*, PlaYUVerFrame* ) { return NULL; }
+
+  virtual Void destroy() { }
+
+  //PlaYUVerFrame* getProcessedFrame() { return m_pcProcessedFrame; }
+
+  Void setModuleDefinition( PlaYUVerModuleDefinition def ) { m_cModuleDef = def; }
+
+protected:
+    virtual void run();
 };
 
 }  // NAMESPACE
diff --git a/source/app/SubWindowHandle.cpp b/source/app/SubWindowHandle.cpp
index 032d015..2198288 100644
--- a/source/app/SubWindowHandle.cpp
+++ b/source/app/SubWindowHandle.cpp
@@ -36,6 +36,7 @@ SubWindowHandle::SubWindowHandle( QWidget * parent ) :
 
   setAttribute( Qt::WA_DeleteOnClose );
   setBackgroundRole( QPalette::Light );
+  setVisible( false );
 
   // Create a new scroll area inside the sub-window
   m_cScrollArea = new QScrollArea( this );
@@ -121,7 +122,7 @@ Void SubWindowHandle::enableModule( PlaYUVerModuleIf* select_module )
     disableModule();
   }
   m_pcCurrentModule = select_module;
-  refreshFrame();
+ // refreshFrame();
 }
 
 Void SubWindowHandle::disableModule()
@@ -148,6 +149,13 @@ Void SubWindowHandle::setCurrFrame( PlaYUVerFrame* pcCurrFrame )
 {
   m_pcCurrFrame = pcCurrFrame;
   m_cViewArea->setImage( m_pcCurrFrame );
+  if( !isVisible() )
+  {
+    show();
+    resize( sizeHint() );
+    zoomToFit();
+
+  }
 }
 
 Void SubWindowHandle::refreshFrame()
@@ -390,7 +398,8 @@ QSize SubWindowHandle::sizeHint() const
   if( m_pcCurrFrame )
     isize = QSize( m_pcCurrFrame->getWidth() + 50, m_pcCurrFrame->getHeight() + 50 );
   else
-    isize = QSize( m_pCurrStream->getWidth() + 50, m_pCurrStream->getHeight() + 50 );
+    if( m_pCurrStream )
+      isize = QSize( m_pCurrStream->getWidth() + 50, m_pCurrStream->getHeight() + 50 );
 
   // If the SubWindowHandle needs more space that the avaiable, we'll give
   // to the subwindow a reasonable size preserving the image aspect ratio.
diff --git a/source/app/plaYUVerApp.cpp b/source/app/plaYUVerApp.cpp
index d6c7e29..939fb38 100644
--- a/source/app/plaYUVerApp.cpp
+++ b/source/app/plaYUVerApp.cpp
@@ -245,8 +245,7 @@ Void plaYUVerApp::ModuleHandling( QAction *curr_action )
   if( interfaceChild )
   {
     mdiArea->addSubWindow( interfaceChild );
-    interfaceChild->show();
-    interfaceChild->zoomToFit();
+
     interfaceChild->getViewArea()->setTool( m_appTool );
   }
   if( activeSubWindow() )