diff --git a/MP4/Makefile b/MP4/Makefile
index 37626f38..d7a716ef 100644
--- a/MP4/Makefile
+++ b/MP4/Makefile
@@ -1,4 +1,4 @@
-SRC = box_avcC.cpp box.cpp box_dinf.cpp box_dref.cpp box_esds.cpp box_ftyp.cpp box_hdlr.cpp box_hmhd.cpp box_mdhd.cpp box_mdia.cpp box_minf.cpp box_moov.cpp box_mvhd.cpp box_nmhd.cpp box_smhd.cpp box_stbl.cpp box_stco.cpp box_stsc.cpp box_stsd.cpp box_stts.cpp box_tkhd.cpp box_trak.cpp box_url.cpp box_vmhd.cpp main.cpp interface.cpp box_mdat.cpp box_rtmp.cpp box_amhp.cpp box_mvex.cpp box_trex.cpp box_afra.cpp box_abst.cpp box_asrt.cpp
+SRC = box_avcC.cpp box.cpp box_dinf.cpp box_dref.cpp box_esds.cpp box_ftyp.cpp box_hdlr.cpp box_hmhd.cpp box_mdhd.cpp box_mdia.cpp box_minf.cpp box_moov.cpp box_mvhd.cpp box_nmhd.cpp box_smhd.cpp box_stbl.cpp box_stco.cpp box_stsc.cpp box_stsd.cpp box_stts.cpp box_tkhd.cpp box_trak.cpp box_url.cpp box_vmhd.cpp main.cpp interface.cpp box_mdat.cpp box_rtmp.cpp box_amhp.cpp box_mvex.cpp box_trex.cpp box_afra.cpp box_abst.cpp box_asrt.cpp box_afrt.cpp
 OBJ = $(SRC:.cpp=.o)
 OUT = Boxtest
 INCLUDES = 
diff --git a/MP4/box_afrt.cpp b/MP4/box_afrt.cpp
new file mode 100644
index 00000000..b42c1195
--- /dev/null
+++ b/MP4/box_afrt.cpp
@@ -0,0 +1,72 @@
+#include "box_afrt.h"
+
+Box_afrt::Box_afrt( ) {
+  Container = new Box( 0x61667274 );
+}
+
+Box_afrt::~Box_afrt() {
+  delete Container;
+}
+
+Box * Box_afrt::GetBox() {
+  return Container;
+}
+
+void Box_afrt::SetUpdate( bool Update ) {
+  isUpdate = Update;
+}
+
+void Box_afrt::AddQualityEntry( std::string Quality, uint32_t Offset ) {
+  if(Offset >= QualitySegmentUrlModifiers.size()) {
+    QualitySegmentUrlModifiers.resize(Offset+1);
+  }
+  QualitySegmentUrlModifiers[Offset] = Quality;
+}
+
+void Box_afrt::AddFragmentRunEntry( uint32_t FirstFragment, uint32_t FirstFragmentTimestamp, uint32_t FragmentsDuration, uint8_t Discontinuity, uint32_t Offset ) {
+  if( Offset >= FragmentRunEntryTable.size() ) {
+    FragmentRunEntryTable.resize(Offset+1);
+  }
+  FragmentRunEntryTable[Offset].FirstFragment = FirstFragment;
+  FragmentRunEntryTable[Offset].FirstFragmentTimestamp = FirstFragmentTimestamp;
+  FragmentRunEntryTable[Offset].FragmentDuration = FragmentsDuration;
+  FragmentRunEntryTable[Offset].DiscontinuityIndicator = Discontinuity;
+}
+
+void Box_afrt::SetDefaults( ) {
+  SetUpdate( );
+  SetTimeScale( );
+}
+
+void Box_afrt::SetTimeScale( uint32_t Scale ) {
+  curTimeScale = Scale;
+}
+
+void Box_afrt::WriteContent( ) {
+  std::string serializedQualities = "";
+  std::string serializedFragmentEntries = "";
+  Container->ResetPayload( );
+
+  for( uint32_t i = 0; i < QualitySegmentUrlModifiers.size(); i++ ) {
+    serializedQualities.append(QualitySegmentUrlModifiers[i].c_str());
+    serializedQualities += '\0';
+  }
+  for( uint32_t i = 0; i < FragmentRunEntryTable.size(); i ++ ) {
+    serializedFragmentEntries.append((char*)Box::uint32_to_uint8(FragmentRunEntryTable[i].FirstFragment));
+    serializedFragmentEntries.append((char*)Box::uint32_to_uint8(0));
+    serializedFragmentEntries.append((char*)Box::uint32_to_uint8(FragmentRunEntryTable[i].FirstFragmentTimestamp));
+    serializedFragmentEntries.append((char*)Box::uint32_to_uint8(FragmentRunEntryTable[i].FragmentDuration));
+    if(FragmentRunEntryTable[i].FragmentDuration == 0) {
+    serializedFragmentEntries.append((char*)Box::uint8_to_uint8(FragmentRunEntryTable[i].DiscontinuityIndicator));
+    }
+  }
+
+  uint32_t OffsetFragmentRunEntryCount = 9 + serializedQualities.size();
+
+  Container->SetPayload((uint32_t)serializedFragmentEntries.size(),(uint8_t*)serializedFragmentEntries.c_str(),OffsetFragmentRunEntryCount+4);
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(FragmentRunEntryTable.size()),OffsetFragmentRunEntryCount);
+  Container->SetPayload((uint32_t)serializedQualities.size(),(uint8_t*)serializedQualities.c_str(),9);
+  Container->SetPayload((uint32_t)1,Box::uint8_to_uint8(QualitySegmentUrlModifiers.size()),8);
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(curTimeScale));
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8((isUpdate ? 1 : 0)));
+}
diff --git a/MP4/box_afrt.h b/MP4/box_afrt.h
new file mode 100644
index 00000000..215e7977
--- /dev/null
+++ b/MP4/box_afrt.h
@@ -0,0 +1,29 @@
+#include "box.h"
+#include <string>
+#include <vector>
+
+struct afrt_fragmentrunentry {
+  uint32_t FirstFragment;
+  uint32_t FirstFragmentTimestamp; //write as uint64_t
+  uint32_t FragmentDuration;
+  uint8_t DiscontinuityIndicator;//if FragmentDuration == 0
+};//afrt_fragmentrunentry
+
+class Box_afrt {
+  public:
+    Box_afrt( );
+    ~Box_afrt();
+    Box * GetBox();
+    void SetUpdate( bool Update = false );
+    void SetTimeScale( uint32_t Scale = 1000 );
+    void AddQualityEntry( std::string Quality = "", uint32_t Offset = 0 );
+    void AddFragmentRunEntry( uint32_t FirstFragment = 0, uint32_t FirstFragmentTimestamp = 0, uint32_t FragmentsDuration = 1, uint8_t Discontinuity = 0, uint32_t Offset = 0 );
+    void WriteContent( );
+  private:
+    void SetDefaults( );
+    bool isUpdate;
+    uint32_t curTimeScale;
+    std::vector<std::string> QualitySegmentUrlModifiers;
+    std::vector<afrt_fragmentrunentry> FragmentRunEntryTable;
+    Box * Container;
+};//Box_ftyp Class
diff --git a/MP4/box_asrt.cpp b/MP4/box_asrt.cpp
index cb777860..73f207ed 100644
--- a/MP4/box_asrt.cpp
+++ b/MP4/box_asrt.cpp
@@ -44,7 +44,7 @@ void Box_asrt::WriteContent( ) {
     serializedQualities += '\0';
   }
 
-  uint32_t OffsetSegmentRunEntryCount = 8 + serializedQualities.size();
+  uint32_t OffsetSegmentRunEntryCount = 5 + serializedQualities.size();
   
   for( uint32_t i = 0; i < SegmentRunEntryTable.size(); i ++ ) {
     Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(SegmentRunEntryTable[i].FragmentsPerSegment),(8*i)+OffsetSegmentRunEntryCount+8);
diff --git a/MP4/box_includes.h b/MP4/box_includes.h
index 9b5f5bef..c466fb67 100644
--- a/MP4/box_includes.h
+++ b/MP4/box_includes.h
@@ -27,5 +27,6 @@
 #include "box_mvex.h"
 #include "box_trex.h"
 #include "box_afra.h"
-#include "box_asrt.h"
 #include "box_abst.h"
+#include "box_asrt.h"
+#include "box_afrt.h"