diff --git a/include/grabber/amlogic/AmlogicWrapper.h b/include/grabber/amlogic/AmlogicWrapper.h
index 3f763f5c..5e355dff 100644
--- a/include/grabber/amlogic/AmlogicWrapper.h
+++ b/include/grabber/amlogic/AmlogicWrapper.h
@@ -18,12 +18,11 @@ public:
 	///
 	/// Constructs the Amlogic frame grabber
 	///
-	/// @param[in] grabWidth  The width of the grabbed image [pixels]
-	/// @param[in] grabHeight  The height of the grabbed images [pixels]
-	/// @param[in] pixelDecimation   Decimation factor for image [pixels]
+	/// @param[in] updateRate_Hz     The image grab rate [Hz]
+	/// @param[in] pixelDecimation   Decimation factor for image [pixels]///
 	///
-	AmlogicWrapper(int pixelDecimation=GrabberWrapper::DEFAULT_PIXELDECIMATION,
-					int updateRate_Hz=GrabberWrapper::DEFAULT_RATE_HZ);
+	AmlogicWrapper(int updateRate_Hz=GrabberWrapper::DEFAULT_RATE_HZ,
+				   int pixelDecimation=GrabberWrapper::DEFAULT_PIXELDECIMATION);
 
 	///
 	/// Constructs the Amlogic frame grabber from configuration settings
diff --git a/libsrc/grabber/amlogic/AmlogicWrapper.cpp b/libsrc/grabber/amlogic/AmlogicWrapper.cpp
index d568e999..6c3b302c 100644
--- a/libsrc/grabber/amlogic/AmlogicWrapper.cpp
+++ b/libsrc/grabber/amlogic/AmlogicWrapper.cpp
@@ -1,14 +1,15 @@
 #include <grabber/amlogic/AmlogicWrapper.h>
 
-AmlogicWrapper::AmlogicWrapper(int pixelDecimation,	int updateRate_Hz)
+AmlogicWrapper::AmlogicWrapper(int updateRate_Hz, int pixelDecimation)
 	: GrabberWrapper(GRABBERTYPE, &_grabber, updateRate_Hz)
-	  , _grabber()
+	, _grabber()
 {
 	_grabber.setPixelDecimation(pixelDecimation);
 }
 
 AmlogicWrapper::AmlogicWrapper(const QJsonDocument& grabberConfig)
-	: GrabberWrapper(GRABBERTYPE, &_grabber)
+	: AmlogicWrapper(GrabberWrapper::DEFAULT_RATE_HZ,
+					 GrabberWrapper::DEFAULT_PIXELDECIMATION)
 {
 	this->handleSettingsUpdate(settings::SYSTEMCAPTURE, grabberConfig);
 }
diff --git a/libsrc/grabber/directx/DirectXWrapper.cpp b/libsrc/grabber/directx/DirectXWrapper.cpp
index c0ba4ecc..1d5d905e 100644
--- a/libsrc/grabber/directx/DirectXWrapper.cpp
+++ b/libsrc/grabber/directx/DirectXWrapper.cpp
@@ -6,14 +6,17 @@ DirectXWrapper::DirectXWrapper( int updateRate_Hz,
 								int cropLeft, int cropRight, int cropTop, int cropBottom
 								)
 	: GrabberWrapper(GRABBERTYPE, &_grabber, updateRate_Hz)
-	  , _grabber(display, cropLeft, cropRight, cropTop, cropBottom)
+	, _grabber(display, cropLeft, cropRight, cropTop, cropBottom)
 
 {
 	_grabber.setPixelDecimation(pixelDecimation);
 }
 
 DirectXWrapper::DirectXWrapper(const QJsonDocument& grabberConfig)
-	: GrabberWrapper(GRABBERTYPE, &_grabber)
+	: DirectXWrapper(GrabberWrapper::DEFAULT_RATE_HZ,
+					 0,
+					 GrabberWrapper::DEFAULT_PIXELDECIMATION,
+					 0,0,0,0)
 {
 	this->handleSettingsUpdate(settings::SYSTEMCAPTURE, grabberConfig);
 }
diff --git a/libsrc/grabber/dispmanx/DispmanxWrapper.cpp b/libsrc/grabber/dispmanx/DispmanxWrapper.cpp
index 32824762..0194a4f1 100644
--- a/libsrc/grabber/dispmanx/DispmanxWrapper.cpp
+++ b/libsrc/grabber/dispmanx/DispmanxWrapper.cpp
@@ -12,7 +12,8 @@ DispmanxWrapper::DispmanxWrapper( int updateRate_Hz,
 }
 
 DispmanxWrapper::DispmanxWrapper(const QJsonDocument& grabberConfig)
-	: GrabberWrapper(GRABBERTYPE, &_grabber)
+	: DispmanxWrapper(GrabberWrapper::DEFAULT_RATE_HZ,
+					  GrabberWrapper::DEFAULT_PIXELDECIMATION)
 {
 	this->handleSettingsUpdate(settings::SYSTEMCAPTURE, grabberConfig);
 }
diff --git a/libsrc/grabber/framebuffer/FramebufferWrapper.cpp b/libsrc/grabber/framebuffer/FramebufferWrapper.cpp
index 2588afed..1797e513 100644
--- a/libsrc/grabber/framebuffer/FramebufferWrapper.cpp
+++ b/libsrc/grabber/framebuffer/FramebufferWrapper.cpp
@@ -4,13 +4,15 @@ FramebufferWrapper::FramebufferWrapper( int updateRate_Hz,
 										int deviceIdx,
 										int pixelDecimation)
 	: GrabberWrapper(GRABBERTYPE, &_grabber, updateRate_Hz)
-	  , _grabber(deviceIdx)
+	, _grabber(deviceIdx)
 {
 	_grabber.setPixelDecimation(pixelDecimation);
 }
 
 FramebufferWrapper::FramebufferWrapper(const QJsonDocument& grabberConfig)
-	: GrabberWrapper(GRABBERTYPE, &_grabber)
+	: FramebufferWrapper(GrabberWrapper::DEFAULT_RATE_HZ,
+						 0,
+						 GrabberWrapper::DEFAULT_PIXELDECIMATION)
 {
 	this->handleSettingsUpdate(settings::SYSTEMCAPTURE, grabberConfig);
 }
diff --git a/libsrc/grabber/osx/OsxWrapper.cpp b/libsrc/grabber/osx/OsxWrapper.cpp
index 86058d4f..d9bb51b8 100644
--- a/libsrc/grabber/osx/OsxWrapper.cpp
+++ b/libsrc/grabber/osx/OsxWrapper.cpp
@@ -5,13 +5,15 @@ OsxWrapper::OsxWrapper( int updateRate_Hz,
 						int pixelDecimation
 						)
 	: GrabberWrapper(GRABBERTYPE, &_grabber, updateRate_Hz)
-	  , _grabber(display)
+	, _grabber(display)
 {
 	_grabber.setPixelDecimation(pixelDecimation);
 }
 
 OsxWrapper::OsxWrapper(const QJsonDocument& grabberConfig)
-	: GrabberWrapper(GRABBERTYPE, &_grabber)
+	: OsxWrapper(GrabberWrapper::DEFAULT_RATE_HZ,
+				 kCGDirectMainDisplay,
+				 GrabberWrapper::DEFAULT_PIXELDECIMATION)
 {
 	this->handleSettingsUpdate(settings::SYSTEMCAPTURE, grabberConfig);
 }
diff --git a/libsrc/grabber/qt/QtWrapper.cpp b/libsrc/grabber/qt/QtWrapper.cpp
index d4560676..1cb8287d 100644
--- a/libsrc/grabber/qt/QtWrapper.cpp
+++ b/libsrc/grabber/qt/QtWrapper.cpp
@@ -6,13 +6,16 @@ QtWrapper::QtWrapper( int updateRate_Hz,
 					  int cropLeft, int cropRight, int cropTop, int cropBottom
 					  )
 	: GrabberWrapper(GRABBERTYPE, &_grabber, updateRate_Hz)
-	  , _grabber(display, cropLeft, cropRight, cropTop, cropBottom)
+	, _grabber(display, cropLeft, cropRight, cropTop, cropBottom)
 {
 	_grabber.setPixelDecimation(pixelDecimation);
 }
 
 QtWrapper::QtWrapper(const QJsonDocument& grabberConfig)
-	: GrabberWrapper(GRABBERTYPE, &_grabber)
+	: QtWrapper(GrabberWrapper::DEFAULT_RATE_HZ,
+				0,
+				GrabberWrapper::DEFAULT_PIXELDECIMATION,
+				0,0,0,0)
 {
 	this->handleSettingsUpdate(settings::SYSTEMCAPTURE, grabberConfig);
 }
diff --git a/libsrc/grabber/x11/X11Wrapper.cpp b/libsrc/grabber/x11/X11Wrapper.cpp
index d8df3cee..df2c5c51 100644
--- a/libsrc/grabber/x11/X11Wrapper.cpp
+++ b/libsrc/grabber/x11/X11Wrapper.cpp
@@ -4,14 +4,16 @@ X11Wrapper::X11Wrapper( int updateRate_Hz,
 						int pixelDecimation,
 						int cropLeft, int cropRight, int cropTop, int cropBottom)
 	: GrabberWrapper(GRABBERTYPE, &_grabber, updateRate_Hz)
-	  , _grabber(cropLeft, cropRight, cropTop, cropBottom)
-	  , _init(false)
+	, _grabber(cropLeft, cropRight, cropTop, cropBottom)
+	, _init(false)
 {
 	_grabber.setPixelDecimation(pixelDecimation);
 }
 
 X11Wrapper::X11Wrapper(const QJsonDocument& grabberConfig)
-	: GrabberWrapper(GRABBERTYPE, &_grabber)
+	: X11Wrapper(GrabberWrapper::DEFAULT_RATE_HZ,
+				 GrabberWrapper::DEFAULT_PIXELDECIMATION,
+				 0,0,0,0)
 {
 	this->handleSettingsUpdate(settings::SYSTEMCAPTURE, grabberConfig);
 }
diff --git a/libsrc/grabber/xcb/XcbWrapper.cpp b/libsrc/grabber/xcb/XcbWrapper.cpp
index aa3db000..c9d4abd4 100644
--- a/libsrc/grabber/xcb/XcbWrapper.cpp
+++ b/libsrc/grabber/xcb/XcbWrapper.cpp
@@ -11,7 +11,9 @@ XcbWrapper::XcbWrapper( int updateRate_Hz,
 }
 
 XcbWrapper::XcbWrapper(const QJsonDocument& grabberConfig)
-	: GrabberWrapper(GRABBERTYPE, &_grabber)
+	: XcbWrapper(GrabberWrapper::DEFAULT_RATE_HZ,
+				 GrabberWrapper::DEFAULT_PIXELDECIMATION,
+				 0,0,0,0)
 {
 	this->handleSettingsUpdate(settings::SYSTEMCAPTURE, grabberConfig);
 }