diff --git a/python/src/SoundStream.cpp b/python/src/SoundStream.cpp
index bc75ecb6..e89c9fed 100644
--- a/python/src/SoundStream.cpp
+++ b/python/src/SoundStream.cpp
@@ -29,28 +29,39 @@
 
 bool CustomSoundStream::OnStart()
 {
+	PyGILState_STATE gstate;
 	bool result = false;
+	gstate = PyGILState_Ensure();
 	if (PyObject_HasAttrString(SoundStream, "OnStart"))
 	{
 		PyObject *OnStart = PyObject_GetAttrString(SoundStream, "OnStart");
-		PyObject *Result = PyObject_CallFunction(OnStart, NULL);
-		result = PyBool_AsBool(Result);
-		Py_DECREF(OnStart);
-		Py_DECREF(Result);
+		if (OnStart != NULL)
+		{
+			PyObject *Result = PyObject_CallFunction(OnStart, NULL);
+			if (Result != NULL)
+			{
+				result = PyBool_AsBool(Result);
+				Py_CLEAR(Result);
+			}
+			Py_CLEAR(OnStart);
+		}
 	}
 	if (PyErr_Occurred())
 	{
 		PyErr_Print();
-		return false;
+		result = false;
 	}
+	PyGILState_Release(gstate);
     return result;
 }
 
 bool CustomSoundStream::OnGetData(Chunk& Data)
 {
+	PyGILState_STATE gstate;
 	bool result = false;
-	Py_CLEAR(PyData);
-	PyObject *Function = PyObject_GetAttrString(SoundStream, "OnGetData");
+	PyObject *Function, *PyData;
+	gstate = PyGILState_Ensure();
+	Function = PyObject_GetAttrString(SoundStream, "OnGetData");
 	if (Function != NULL)
 	{
 		PyData = PyObject_CallFunction(Function, NULL);
@@ -62,15 +73,16 @@ bool CustomSoundStream::OnGetData(Chunk& Data)
 				if (Data.NbSamples > 0)
 					result = true;
 			}
+			Py_CLEAR(PyData);
 		}
-		Py_DECREF(Function);
+		Py_CLEAR(Function);
 	}
 	if (PyErr_Occurred())
 	{
 		PyErr_Print();
-		Py_CLEAR(PyData);
-		return false;
+		result = false;
 	}
+	PyGILState_Release(gstate);
     return result;
 }
 
@@ -94,7 +106,6 @@ PySfSoundStream_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	if (self != NULL)
 	{
 		self->obj = new CustomSoundStream();
-		self->obj->PyData = NULL;
 		self->obj->SoundStream = (PyObject *)self;
 	}
 	return (PyObject *)self;
diff --git a/python/src/SoundStream.hpp b/python/src/SoundStream.hpp
index 6569bb03..d9e0a377 100644
--- a/python/src/SoundStream.hpp
+++ b/python/src/SoundStream.hpp
@@ -33,7 +33,6 @@ class CustomSoundStream : public sf::SoundStream
 {
 public :
 	PyObject *SoundStream;
-	PyObject *PyData;
     virtual bool OnStart();
     virtual bool OnGetData(Chunk& Data);
 	void Init(unsigned int ChannelsCount, unsigned int SampleRate);
diff --git a/python/src/VideoMode.cpp b/python/src/VideoMode.cpp
index 5b630546..b989cd43 100644
--- a/python/src/VideoMode.cpp
+++ b/python/src/VideoMode.cpp
@@ -54,25 +54,16 @@ PySfVideoMode_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	if (self != NULL)
 	{
 		self->BitsPerPixel = 32;
-		if (!PyArg_ParseTupleAndKeywords(args, kwds, "II|I:VideoMode.__init__", (char **)kwlist, &self->Width, &self->Height, &self->BitsPerPixel))
+		if (!PyArg_ParseTupleAndKeywords(args, kwds, "II|I:VideoMode.__new__", (char **)kwlist, &self->Width, &self->Height, &self->BitsPerPixel))
 			return NULL;
 		self->obj = new sf::VideoMode(self->Width, self->Height, self->BitsPerPixel);
 	}
 	return (PyObject *)self;
 }
 
-void
-PySfVideoModeUpdate(PySfVideoMode *self)
-{
-	self->obj->Width = self->Width;
-	self->obj->Height = self->Height;
-	self->obj->BitsPerPixel = self->BitsPerPixel;
-}
-
 static PyObject *
 PySfVideoMode_IsValid(PySfVideoMode* self)
 {
-	PySfVideoModeUpdate(self);
 	return PyBool_FromLong(self->obj->IsValid());
 }
 
@@ -122,16 +113,37 @@ static PyMethodDef PySfVideoMode_methods[] = {
 	{NULL}  /* Sentinel */
 };
 
-int PySfVideoMode_Compare(PyObject *o1, PyObject *o2)
+PyObject *
+PySfVideoMode_richcompare(PyObject *o1, PyObject *o2, int op)
 {
-	PySfVideoModeUpdate((PySfVideoMode *)o1);
-	PySfVideoModeUpdate((PySfVideoMode *)o2);
-	if (*(((PySfVideoMode *)o1)->obj) == *(((PySfVideoMode *)o2)->obj))
-		return 0;
-	else
-		return 1;
+	if (*(((PySfVideoMode *)o1)->obj) == *(((PySfVideoMode *)o2)->obj))
+	{
+		if (op==Py_EQ)
+			Py_RETURN_TRUE;
+		if (op==Py_NE)
+			Py_RETURN_FALSE;
+	}
+	else
+	{
+		if (op==Py_EQ)
+			Py_RETURN_FALSE;
+		if (op==Py_NE)
+			Py_RETURN_TRUE;
+	}
+	PyErr_SetString(PyExc_TypeError, "VideoMode comparison : only == and != make sens.");
+	return NULL;
+}
+
+int
+PySfVideoMode_setattro(PyObject* self, PyObject *attr_name, PyObject *v)
+{
+	int result = PyObject_GenericSetAttr(self, attr_name, v);
+	PySfVideoMode *Mode = (PySfVideoMode *)self;
+	Mode->obj->Width = Mode->Width;
+	Mode->obj->Height = Mode->Height;
+	Mode->obj->BitsPerPixel = Mode->BitsPerPixel;
+	return result;
 }
-
 
 PyTypeObject PySfVideoModeType = {
 	head_init
@@ -142,7 +154,7 @@ PyTypeObject PySfVideoModeType = {
 	0,						/*tp_print*/
 	0,						/*tp_getattr*/
 	0,						/*tp_setattr*/
-	PySfVideoMode_Compare,	/*tp_compare*/
+	0,						/*tp_compare*/
 	0,						/*tp_repr*/
 	0,						/*tp_as_number*/
 	0,						/*tp_as_sequence*/
@@ -159,7 +171,7 @@ Default constructor : VideoMode()\n\
 Construct the video mode with its attributes : VideoMode(ModeWidth, ModeHeight, ModeBpp = 32)\n	ModeWidth  : Width in pixels\n	ModeHeight : Height in pixels\n	ModeBpp    : Pixel depths in bits per pixel (32 by default)", /* tp_doc */
 	0,						/* tp_traverse */
 	0,						/* tp_clear */
-	0,						/* tp_richcompare */
+	PySfVideoMode_richcompare, /* tp_richcompare */
 	0,						/* tp_weaklistoffset */
 	0,						/* tp_iter */
 	0,						/* tp_iternext */
diff --git a/python/src/VideoMode.hpp b/python/src/VideoMode.hpp
index 59e3e274..3db195e8 100644
--- a/python/src/VideoMode.hpp
+++ b/python/src/VideoMode.hpp
@@ -37,9 +37,6 @@ typedef struct {
 	sf::VideoMode *obj;
 } PySfVideoMode;
 
-void
-PySfVideoModeUpdate(PySfVideoMode *self);
-
 PySfVideoMode *
 GetNewPySfVideoMode();
 
diff --git a/python/src/Window.cpp b/python/src/Window.cpp
index bed8e702..7f32370e 100644
--- a/python/src/Window.cpp
+++ b/python/src/Window.cpp
@@ -131,8 +131,7 @@ PySfWindow_Create(PySfWindow* self, PyObject *args, PyObject *kwds)
 	if (!PyArg_ParseTupleAndKeywords(args, kwds, "O!s|IO!:Window.Create", (char **)kwlist, &PySfVideoModeType, &VideoModeTmp, &Title, &WindowStyle, &PySfWindowSettingsType, &Params))
 		return NULL; 
 
-	VideoMode = ((PySfVideoMode *)VideoModeTmp)->obj;
-	PySfVideoModeUpdate((PySfVideoMode *)VideoModeTmp);
+	VideoMode = ((PySfVideoMode *)VideoModeTmp)->obj;
 
 	if (Params)
 	{
diff --git a/python/src/main.cpp b/python/src/main.cpp
index 517b7bda..91944ffa 100644
--- a/python/src/main.cpp
+++ b/python/src/main.cpp
@@ -294,6 +294,8 @@ initsf(void)
 	PySfSoundStream_InitConst();
 	PySfString_InitConst();
 
+	PyEval_InitThreads();
+
 #ifdef IS_PY3K
 	return m;
 #endif