diff --git a/MP4/box_stco.cpp b/MP4/box_stco.cpp
new file mode 100644
index 00000000..bd4c4b17
--- /dev/null
+++ b/MP4/box_stco.cpp
@@ -0,0 +1,37 @@
+#include "box_stco.h"
+
+Box_stco::Box_stco( ) {
+  Container = new Box( 0x7374636F );
+  SetReserved();
+}
+
+Box_stco::~Box_stco() {
+  delete Container;
+}
+
+Box * Box_stco::GetBox() {
+  return Container;
+}
+
+void Box_stco::SetReserved( ) {
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(0));
+}
+
+void Box_stco::AddOffset( uint32_t DataOffset, uint32_t Offset ) {
+  if(Offset >= Offsets.size()) {
+    Offsets.resize(Offset+1);
+  }
+  Offsets[Offset] = DataOffset;
+}
+
+
+void Box_stco::WriteOffsets( ) {
+  Container->ResetPayload();
+  SetReserved( );
+  if(!Offsets.empty()) {
+    for(int32_t i = Offsets.size() -1; i >= 0; i--) {
+      Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(Offsets[i]),(i*4)+8);
+    }
+  }
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(Offsets.size()),4);
+}
diff --git a/MP4/box_stco.h b/MP4/box_stco.h
new file mode 100644
index 00000000..3c9ffa42
--- /dev/null
+++ b/MP4/box_stco.h
@@ -0,0 +1,18 @@
+#include "box.h"
+#include <string>
+#include <vector>
+
+class Box_stco {
+  public:
+    Box_stco( );
+    ~Box_stco();
+    Box * GetBox();
+    void SetReserved( );
+    void AddOffset( uint32_t DataOffset, uint32_t Offset = 0 );
+  private:
+    Box * Container;
+
+    void WriteOffsets( );
+    std::vector<uint32_t> Offsets;
+};//Box_ftyp Class
+