diff --git a/MP4/box_avcC.cpp b/MP4/box_avcC.cpp
index 293bf168..0bcb15eb 100644
--- a/MP4/box_avcC.cpp
+++ b/MP4/box_avcC.cpp
@@ -55,7 +55,7 @@ void Box_avcC::SetReserved( ) {
 }
 
 void Box_avcC::SetDefaults( ) {
-  SetResolution ( );
-  SetFrameCount ( );
   SetDepth ( );
+  SetFrameCount ( );
+  SetResolution ( );
 }
diff --git a/MP4/box_avcC.h b/MP4/box_avcC.h
index fc7dd27e..51d7dbd7 100644
--- a/MP4/box_avcC.h
+++ b/MP4/box_avcC.h
@@ -6,15 +6,16 @@ class Box_avcC {
     Box_avcC( );
     ~Box_avcC();
     Box * GetBox();
-    void SetReserved( );
-    void SetDataReferenceIndex( uint16_t DataReferenceIndex );
-    void SetDimensions ( uint16_t Width, uint16_t Height );
+    void SetDataReferenceIndex( uint16_t DataReferenceIndex = 0 );
+    void SetDimensions ( uint16_t Width = 0, uint16_t Height = 0);
     void SetResolution ( uint32_t Horizontal = 0x00480000, uint32_t Vertical = 0x00480000 );
     void SetFrameCount ( uint16_t FrameCount = 1 );
-    void SetCompressorName ( std::string CompressorName );
+    void SetCompressorName ( std::string CompressorName = "");
     void SetDepth ( uint16_t Depth = 0x0018 );
-    void SetDefaults( );
   private:
     Box * Container;
+
+    void SetReserved( );
+    void SetDefaults( );
 };//Box_ftyp Class
 
diff --git a/MP4/box_ftyp.cpp b/MP4/box_ftyp.cpp
index 1de5f1b6..67262dc5 100644
--- a/MP4/box_ftyp.cpp
+++ b/MP4/box_ftyp.cpp
@@ -1,9 +1,7 @@
 #include "box_ftyp.h"
 
-Box_ftyp::Box_ftyp( uint32_t MajorBrand, uint32_t MinorBrand ) {
+Box_ftyp::Box_ftyp( ) {
   Container = new Box( 0x66747970 );
-  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(MajorBrand));
-  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(MinorBrand),4);
 }
 
 Box_ftyp::~Box_ftyp() {
@@ -21,3 +19,8 @@ void Box_ftyp::SetMajorBrand( uint32_t MajorBrand ) {
 void Box_ftyp::SetMinorBrand( uint32_t MinorBrand ) {
   Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(MinorBrand),4);
 }
+
+void Box_ftyp::SetDefaults( ) {
+  SetMinorBrand( );
+  SetMajorBrand( );
+}
diff --git a/MP4/box_ftyp.h b/MP4/box_ftyp.h
index f5b0c746..2a7ac9cd 100644
--- a/MP4/box_ftyp.h
+++ b/MP4/box_ftyp.h
@@ -2,12 +2,13 @@
 
 class Box_ftyp {
   public:
-    Box_ftyp( uint32_t MajorBrand = 0x66347620, uint32_t MinorBrand = 0x1);
+    Box_ftyp( );
     ~Box_ftyp();
     Box * GetBox();
-    void SetMajorBrand( uint32_t MajorBrand );
-    void SetMinorBrand( uint32_t MinorBrand );
+    void SetMajorBrand( uint32_t MajorBrand = 0x66347620 );
+    void SetMinorBrand( uint32_t MinorBrand = 0x1 );
   private:
+    void SetDefaults( );
     Box * Container;
 };//Box_ftyp Class
 
diff --git a/MP4/box_hdlr.cpp b/MP4/box_hdlr.cpp
index 41b70604..48fa1de2 100644
--- a/MP4/box_hdlr.cpp
+++ b/MP4/box_hdlr.cpp
@@ -37,3 +37,8 @@ void Box_hdlr::SetName ( std::string Name ) {
   SetHandlerType(0);
   Container->SetPayload((uint32_t)strlen(tmp)+1,(uint8_t*)tmp,24);
 }
+
+void Box_hdlr::SetDefaults( ) {
+  SetName( );
+  SetHandlerType( );
+}
diff --git a/MP4/box_hdlr.h b/MP4/box_hdlr.h
index 45fd2e0d..c12cfa12 100644
--- a/MP4/box_hdlr.h
+++ b/MP4/box_hdlr.h
@@ -6,11 +6,12 @@ class Box_hdlr {
     Box_hdlr( );
     ~Box_hdlr();
     Box * GetBox();
-    void SetHandlerType( uint32_t HandlerType );
-    void SetName ( std::string Name );
+    void SetHandlerType( uint32_t HandlerType = 0 );
+    void SetName ( std::string Name = "" );
   private:
     Box * Container;
     void SetReserved( );
+    void SetDefaults( );
     uint32_t CurrentHandlerType;
 };//Box_ftyp Class
 
diff --git a/MP4/box_stco.h b/MP4/box_stco.h
index 3c9ffa42..a75b566b 100644
--- a/MP4/box_stco.h
+++ b/MP4/box_stco.h
@@ -7,12 +7,12 @@ class Box_stco {
     Box_stco( );
     ~Box_stco();
     Box * GetBox();
-    void SetReserved( );
     void AddOffset( uint32_t DataOffset, uint32_t Offset = 0 );
   private:
     Box * Container;
 
     void WriteOffsets( );
+    void SetReserved( );
     std::vector<uint32_t> Offsets;
 };//Box_ftyp Class
 
diff --git a/MP4/box_stsc.h b/MP4/box_stsc.h
index 53e7ba9e..6e1c77f2 100644
--- a/MP4/box_stsc.h
+++ b/MP4/box_stsc.h
@@ -14,7 +14,7 @@ class Box_stsc {
     ~Box_stsc();
     Box * GetBox();
     void SetReserved( );
-    void AddEntry( uint32_t FirstChunk, uint32_t SamplesPerChunk, uint32_t SampleDescIndex, uint32_t Offset = 0 );
+    void AddEntry( uint32_t FirstChunk = 0, uint32_t SamplesPerChunk = 0, uint32_t SampleDescIndex = 0, uint32_t Offset = 0 );
   private:
     Box * Container;