diff --git a/MP4/box_tkhd.cpp b/MP4/box_tkhd.cpp
index 7795d370..bae1bc5f 100644
--- a/MP4/box_tkhd.cpp
+++ b/MP4/box_tkhd.cpp
@@ -12,7 +12,6 @@ Box * Box_tkhd::GetBox() {
   return Container;
 }
 
-/*
 void Box_mdhd::SetCreationTime( uint32_t TimeStamp ) {
   uint32_t CreationTime;
   if(!TimeStamp) {
@@ -38,8 +37,23 @@ void Box_mdhd::SetDurationTime( uint32_t TimeUnits ) {
 }
 
 void Box_mdhd::SetReserved() {
+  Container->SetPayload((uint32_t)4,Box::uint16_to_uint8(0x40000000),68);
+  Container->SetPayload((uint32_t)4,Box::uint16_to_uint8(0),64);
+  Container->SetPayload((uint32_t)4,Box::uint16_to_uint8(0),60);
+  Container->SetPayload((uint32_t)4,Box::uint16_to_uint8(0),56);
+  Container->SetPayload((uint32_t)4,Box::uint16_to_uint8(0x10000),52);
+  Container->SetPayload((uint32_t)4,Box::uint16_to_uint8(0),48);
+  Container->SetPayload((uint32_t)4,Box::uint16_to_uint8(0),44);
+  Container->SetPayload((uint32_t)4,Box::uint16_to_uint8(0),40);
+  Container->SetPayload((uint32_t)4,Box::uint16_to_uint8(0x10000),36);
+  Container->SetPayload((uint32_t)4,Box::uint16_to_uint8(0),34);
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(0),28);
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(0),24);
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(0),20);
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(0),12);
 }
 
+/*
 void Box_mdhd::SetDefaults() {
 }
 */