diff --git a/MP4/box_stsc.cpp b/MP4/box_stsc.cpp
new file mode 100644
index 00000000..f6abf930
--- /dev/null
+++ b/MP4/box_stsc.cpp
@@ -0,0 +1,42 @@
+#include "box_stsc.h"
+
+Box_stsc::Box_stsc( ) {
+  Container = new Box( 0x73747363 );
+  SetReserved();
+}
+
+Box_stsc::~Box_stsc() {
+  delete Container;
+}
+
+Box * Box_stsc::GetBox() {
+  return Container;
+}
+
+void Box_stsc::SetReserved( ) {
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(0));
+}
+
+void Box_stsc::AddEntry( uint32_t FirstChunk, uint32_t SamplesPerChunk, uint32_t SampleDescIndex, uint32_t Offset = 0 ) {
+  if(Offset >= Entries.size()) {
+    Entries.resize(Offset+1);
+  }
+  Entries[Offset].FirstChunk = FirstChunk;
+  Entries[Offset].SamplesPerChunk = SamplesPerChunk;
+  Entries[Offset].SampleDescIndex = SampleDescIndex;
+  WriteEntries( );
+}
+
+
+void Box_stsc::WriteEntries( ) {
+  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(Entries[i].SampleDescIndex),(i*12)+16);
+      Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(Entries[i].SamplesPerChunk),(i*12)+12);
+      Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(Entries[i].FirstChunk),(i*12)+8);
+    }
+  }
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(Offsets.size()),4);
+}
diff --git a/MP4/box_stsc.h b/MP4/box_stsc.h
new file mode 100644
index 00000000..53e7ba9e
--- /dev/null
+++ b/MP4/box_stsc.h
@@ -0,0 +1,24 @@
+#include "box.h"
+#include <string>
+#include <vector>
+
+struct stsc_record {
+  uint32_t FirstChunk;
+  uint32_t SamplesPerChunk;
+  uint32_t SampleDescIndex;
+};//stsc_record
+
+class Box_stsc {
+  public:
+    Box_stsc( );
+    ~Box_stsc();
+    Box * GetBox();
+    void SetReserved( );
+    void AddEntry( uint32_t FirstChunk, uint32_t SamplesPerChunk, uint32_t SampleDescIndex, uint32_t Offset = 0 );
+  private:
+    Box * Container;
+
+    void WriteEntries( );
+    std::vector<stsc_record> Entries;
+};//Box_ftyp Class
+
diff --git a/MP4/box_stts.cpp b/MP4/box_stts.cpp
new file mode 100644
index 00000000..da9269c4
--- /dev/null
+++ b/MP4/box_stts.cpp
@@ -0,0 +1,40 @@
+#include "box_stts.h"
+
+Box_stts::Box_stts( ) {
+  Container = new Box( 0x73747473 );
+  SetReserved();
+}
+
+Box_stts::~Box_stsc() {
+  delete Container;
+}
+
+Box * Box_stts::GetBox() {
+  return Container;
+}
+
+void Box_stts::SetReserved( ) {
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(0));
+}
+
+void Box_stts::AddEntry( uint32_t SampleCount, uint32_t SamplesDelta, uint32_t Offset = 0 ) {
+  if(Offset >= Entries.size()) {
+    Entries.resize(Offset+1);
+  }
+  Entries[Offset].SampleCount = SampleCount;
+  Entries[Offset].SampleDelta = SampleDelta;
+  WriteEntries( );
+}
+
+
+void Box_stts::WriteEntries( ) {
+  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(Entries[i].SampleDelta),(i*8)+12);
+      Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(Entries[i].SampleCount),(i*8)+8);
+    }
+  }
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(Offsets.size()),4);
+}
diff --git a/MP4/box_stts.h b/MP4/box_stts.h
new file mode 100644
index 00000000..c368a78e
--- /dev/null
+++ b/MP4/box_stts.h
@@ -0,0 +1,23 @@
+#include "box.h"
+#include <string>
+#include <vector>
+
+struct stts_record {
+  uint32_t SampleCount;
+  uint32_t SampleDelta;
+};//stsc_record
+
+class Box_stts {
+  public:
+    Box_stsc( );
+    ~Box_stsc();
+    Box * GetBox();
+    void SetReserved( );
+    void AddEntry( uint32_t SampleCount, uint32_t SampleDelta, uint32_t Offset = 0 );
+  private:
+    Box * Container;
+
+    void WriteEntries( );
+    std::vector<stts_record> Entries;
+};//Box_ftyp Class
+