diff --git a/src/JT1078.FMp4.Test/Boxs/MediaHeaderBox_Test.cs b/src/JT1078.FMp4.Test/Boxs/MediaHeaderBox_Test.cs
new file mode 100644
index 0000000..1013f8c
--- /dev/null
+++ b/src/JT1078.FMp4.Test/Boxs/MediaHeaderBox_Test.cs
@@ -0,0 +1,39 @@
+using JT1078.FMp4.MessagePack;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xunit;
+using JT1078.Protocol.Extensions;
+
+namespace JT1078.FMp4.Test.Boxs
+{
+    public class MediaHeaderBox_Test
+    {
+        /// <summary>
+        /// 使用doc/video/demo.mp4
+        /// </summary>
+        [Fact]
+        public void Test1()
+        {
+            //00 00 00 20--box size 32
+            //6d 64 68 64--box type mdhd
+            //00--version
+            //00 00 00--flags
+            //d9 3e 0b 8e--creation_time
+            //d9 3e 0b 8e--modification_time
+            //00 00 bb 80--timescale
+            //00 05 28 00--duration
+            //55 c4--(pad(1) + language(15))
+            //00 00--pre_defined
+            MediaHeaderBox movieHeaderBox = new MediaHeaderBox(version:0);
+            movieHeaderBox.CreationTime = 0xd93e0b8e;
+            movieHeaderBox.ModificationTime = 0xd93e0b8e;
+            movieHeaderBox.Timescale = 0x0000bb80;
+            movieHeaderBox.Duration = 0x00052800;
+            FMp4MessagePackWriter writer = new MessagePack.FMp4MessagePackWriter(new byte[0x6c]);
+            movieHeaderBox.ToBuffer(ref writer);
+            var hex = writer.FlushAndGetArray().ToHexString();
+            Assert.Equal("000000206d64686400000000d93e0b8ed93e0b8e0000bb800005280055c40000".ToUpper(), hex);
+        }
+    }
+}
diff --git a/src/JT1078.FMp4.Test/Boxs/MovieHeaderBox_Test.cs b/src/JT1078.FMp4.Test/Boxs/MovieHeaderBox_Test.cs
new file mode 100644
index 0000000..b62b7d2
--- /dev/null
+++ b/src/JT1078.FMp4.Test/Boxs/MovieHeaderBox_Test.cs
@@ -0,0 +1,48 @@
+using JT1078.FMp4.MessagePack;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xunit;
+using JT1078.Protocol.Extensions;
+
+namespace JT1078.FMp4.Test.Boxs
+{
+    public class MovieHeaderBox_Test
+    {
+        /// <summary>
+        /// 使用doc/video/demo.mp4
+        /// </summary>
+        [Fact]
+        public void Test1()
+        {
+            //00 00 00 6c--box size
+            //6d 76 68 64--box type mvhd
+            //00--version
+            //00 00 00--flags
+            //d9 3e 0b 8e--creation time
+            //d9 3e 0b 8e--modification time
+            //00 01 5f 90--time scale
+            //00 09 c7 e4 --duration
+            //00 01 00 00--rate
+            //01 00--volume
+            //00 00 00 00 00 00 00 00 00 00--保留位 10位
+            //00 01 00 00 00 00 00 00 00 00 00 00--matrix 视频变换矩阵36 -12
+            //00 00 00 00 00 01 00 00 00 00 00 00--matrix 视频变换矩阵36 -24
+            //00 00 00 00 00 00 00 00 40 00 00 00--matrix 视频变换矩阵36 -36
+            //00 00 00 00 00 00 00 00--pre - defined 24 - 8
+            //00 00 00 00 00 00 00 00--pre - defined 24 - 16
+            //00 00 00 00 00 00 00 00--pre - defined 24 - 24
+            //00 00 00 03--next track id
+            MovieHeaderBox movieHeaderBox = new MovieHeaderBox(version:0);
+            movieHeaderBox.CreationTime = 0xd93e0b8e;
+            movieHeaderBox.ModificationTime = 0xd93e0b8e;
+            movieHeaderBox.Timescale = 0x00015f90;
+            movieHeaderBox.Duration = 0x0009c7e4;
+            movieHeaderBox.NextTrackID = 3;
+            FMp4MessagePackWriter writer = new MessagePack.FMp4MessagePackWriter(new byte[0x6c]);
+            movieHeaderBox.ToBuffer(ref writer);
+            var hex = writer.FlushAndGetArray().ToHexString();
+            Assert.Equal("00 00 00 6c 6d 76 68 64 00 00 00 00 d9 3e 0b 8e d9 3e 0b 8e 00 01 5f 90 00 09 c7 e4 00 01 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03".Replace(" ","").ToUpper(), hex);
+        }
+    }
+}
diff --git a/src/JT1078.FMp4.Test/Boxs/TrackHeaderBox_Test.cs b/src/JT1078.FMp4.Test/Boxs/TrackHeaderBox_Test.cs
new file mode 100644
index 0000000..6d14d89
--- /dev/null
+++ b/src/JT1078.FMp4.Test/Boxs/TrackHeaderBox_Test.cs
@@ -0,0 +1,49 @@
+using JT1078.FMp4.MessagePack;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xunit;
+using JT1078.Protocol.Extensions;
+
+namespace JT1078.FMp4.Test.Boxs
+{
+    public class TrackHeaderBox_Test
+    {
+        /// <summary>
+        /// 使用doc/video/demo.mp4
+        /// </summary>
+        [Fact]
+        public void Test1()
+        {
+            //00 00 00 5c--box size 92
+            //74 6b 68 64--box type tkhd
+            //00--version
+            //00 00 01--flags
+            //d9 3e 0b 8e--creation_time
+            //d9 3e 0b 8e--modification_time
+            //00 00 00 01--track_ID
+            //00 00 00 00--reserved1 保留位1
+            //00 09 ab 00--duration
+            //00 00 00 00 00 00 00 00-- reserved2 保留位2
+            //00 00--layer
+            //00 00--alternate_group
+            //01 00--volume
+            //00 00-- reserved3 保留位3
+            //00 01 00 00 00 00 00 00 00 00 00 00--matrix 视频变换矩阵36 -12
+            //00 00 00 00 00 01 00 00 00 00 00 00--matrix 视频变换矩阵36 -24
+            //00 00 00 00 00 00 00 00 40 00 00 00--matrix 视频变换矩阵36 -36
+            //00 00 00 00--width
+            //00 00 00 00--height
+            TrackHeaderBox trackHeaderBox = new TrackHeaderBox(version:0,flags:1);
+            trackHeaderBox.CreationTime = 0xd93e0b8e;
+            trackHeaderBox.ModificationTime = 0xd93e0b8e;
+            trackHeaderBox.TrackID = 1;
+            trackHeaderBox.TrackIsAudio = true;
+            trackHeaderBox.Duration = 0x0009ab00;
+            FMp4MessagePackWriter writer = new MessagePack.FMp4MessagePackWriter(new byte[0x6c]);
+            trackHeaderBox.ToBuffer(ref writer);
+            var hex = writer.FlushAndGetArray().ToHexString();
+            Assert.Equal("0000005c746b686400000001d93e0b8ed93e0b8e00000001000000000009ab00000000000000000000000000010000000001000000000000000000000000000000010000000000000000000000000000400000000000000000000000".ToUpper(), hex);
+        }
+    }
+}
diff --git a/src/JT1078.FMp4/Boxs/FileTypeBox.cs b/src/JT1078.FMp4/Boxs/FileTypeBox.cs
index a0cedd9..65a2392 100644
--- a/src/JT1078.FMp4/Boxs/FileTypeBox.cs
+++ b/src/JT1078.FMp4/Boxs/FileTypeBox.cs
@@ -33,7 +33,7 @@ namespace JT1078.FMp4
 
         public void ToBuffer(ref FMp4MessagePackWriter writer)
         {
-            ToBuffer(ref writer,out int sizePosition);
+            Start(ref writer);
             writer.WriteASCII(MajorBrand);
             writer.WriteASCII(MinorVersion);
             if(CompatibleBrands!=null && CompatibleBrands.Count > 0)
@@ -43,7 +43,7 @@ namespace JT1078.FMp4
                     writer.WriteASCII(item);
                 }
             }
-            writer.WriteUInt32Return((uint)(writer.GetCurrentPosition()- sizePosition), sizePosition);
+            End(ref writer);
         }
     }
 }
diff --git a/src/JT1078.FMp4/Boxs/MediaHeaderBox.cs b/src/JT1078.FMp4/Boxs/MediaHeaderBox.cs
index 09147c7..b2d3f5f 100644
--- a/src/JT1078.FMp4/Boxs/MediaHeaderBox.cs
+++ b/src/JT1078.FMp4/Boxs/MediaHeaderBox.cs
@@ -1,24 +1,50 @@
-using System;
+using JT1078.FMp4.Interfaces;
+using JT1078.FMp4.MessagePack;
+using System;
 using System.Collections.Generic;
 using System.Text;
 
 namespace JT1078.FMp4
 {
-    public class MediaHeaderBox : FullBox
+    public class MediaHeaderBox : FullBox, IFMp4MessagePackFormatter
     {
         public MediaHeaderBox(byte version, uint flags=0) : base("mdhd", version, flags)
         {
         }
-        public uint CreationTime { get; set; }
-        public uint ModificationTime { get; set; }
+        public ulong CreationTime { get; set; }
+        public ulong ModificationTime { get; set; }
         public uint Timescale { get; set; }
-        public uint Duration { get; set; } = 1;
+        public ulong Duration { get; set; } = 1;
         //public bool Pad { get; set; }
         /// <summary>
         /// ISO-639-2/T language code
+        /// ref:doc\fmp4\ISO Language Codes.txt
         /// und-undetermined
         /// </summary>
-        public string Language { get; set; }
+        public string Language { get; set; } = "und";
         public ushort PreDefined { get; set; }
+
+        public void ToBuffer(ref FMp4MessagePackWriter writer)
+        {
+            Start(ref writer);
+            WriterToBuffer(ref writer);
+            if (Version == 1)
+            {
+                writer.WriteUInt64(CreationTime);
+                writer.WriteUInt64(ModificationTime);
+                writer.WriteUInt32(Timescale);
+                writer.WriteUInt64(Duration);
+            }
+            else
+            {
+                writer.WriteUInt32((uint)CreationTime);
+                writer.WriteUInt32((uint)ModificationTime);
+                writer.WriteUInt32(Timescale);
+                writer.WriteUInt32((uint)Duration);
+            }
+            writer.WriteIso639(Language);
+            writer.WriteUInt16(PreDefined);
+            End(ref writer);
+        }
     }
 }
diff --git a/src/JT1078.FMp4/Boxs/MovieHeaderBox.cs b/src/JT1078.FMp4/Boxs/MovieHeaderBox.cs
index 13896d7..20ae6c0 100644
--- a/src/JT1078.FMp4/Boxs/MovieHeaderBox.cs
+++ b/src/JT1078.FMp4/Boxs/MovieHeaderBox.cs
@@ -1,18 +1,20 @@
-using System;
+using JT1078.FMp4.Interfaces;
+using JT1078.FMp4.MessagePack;
+using System;
 using System.Collections.Generic;
 using System.Text;
 
 namespace JT1078.FMp4
 {
-    public class MovieHeaderBox : FullBox
+    public class MovieHeaderBox : FullBox, IFMp4MessagePackFormatter
     {
         public MovieHeaderBox(byte version, uint flags=0) : base("mvhd", version, flags)
         {
         }
-        public uint CreationTime { get; set; } 
-        public uint ModificationTime { get; set; }
+        public ulong CreationTime { get; set; } 
+        public ulong ModificationTime { get; set; }
         public uint Timescale { get; set;}
-        public uint Duration { get; set; }
+        public ulong Duration { get; set; }
         public int Rate { get; set; } = 0x00010000;
         public short Volume { get; set; } = 0x0100;
         public byte[] Reserved1 { get; set; } = new byte[2];
@@ -20,5 +22,44 @@ namespace JT1078.FMp4
         public int[] Matrix { get; set; }=new int [9]{ 0x00010000, 0, 0, 0, 0x00010000, 0, 0, 0, 0x40000000 };
         public byte[] PreDefined { get; set; } = new byte[24];
         public uint NextTrackID { get; set; }= uint.MaxValue;
+        public void ToBuffer(ref FMp4MessagePackWriter writer)
+        {
+            Start(ref writer);
+            WriterToBuffer(ref writer);
+            if (Version == 1)
+            {
+                writer.WriteUInt64(CreationTime);
+                writer.WriteUInt64(ModificationTime);
+                writer.WriteUInt32(Timescale);
+                writer.WriteUInt64(Duration);
+            }
+            else
+            {
+                writer.WriteUInt32((uint)CreationTime);
+                writer.WriteUInt32((uint)ModificationTime);
+                writer.WriteUInt32(Timescale);
+                writer.WriteUInt32((uint)Duration);
+            }
+            writer.WriteInt32(Rate);
+            writer.WriteInt16(Volume);
+            foreach(var r in Reserved1)
+            {
+                writer.WriteByte(r);
+            }
+            foreach (var r in Reserved2)
+            {
+                writer.WriteUInt32(r);
+            }
+            foreach(var m in Matrix)
+            {
+                writer.WriteInt32(m);
+            }
+            foreach (var pd in PreDefined)
+            {
+                writer.WriteByte(pd);
+            }
+            writer.WriteUInt32(NextTrackID);
+            End(ref writer);
+        }
     }
 }
diff --git a/src/JT1078.FMp4/Boxs/TrackBox.cs b/src/JT1078.FMp4/Boxs/TrackBox.cs
index a6ff84f..533e2af 100644
--- a/src/JT1078.FMp4/Boxs/TrackBox.cs
+++ b/src/JT1078.FMp4/Boxs/TrackBox.cs
@@ -10,8 +10,8 @@ namespace JT1078.FMp4
         {
         }
          public TrackHeaderBox TrackHeaderBox { get; set; }
-         public TrackReferenceBox TrackReferenceBox { get; set; }
-         public EditBox EditBox { get; set; }
-         public MediaBox MediaBox { get; set; }
+        //不是必须的    public TrackReferenceBox TrackReferenceBox { get; set; } 
+        //不是必须的    public EditBox EditBox { get; set; }
+        public MediaBox MediaBox { get; set; }
     }
 }
diff --git a/src/JT1078.FMp4/Boxs/TrackHeaderBox.cs b/src/JT1078.FMp4/Boxs/TrackHeaderBox.cs
index f1db694..96ea670 100644
--- a/src/JT1078.FMp4/Boxs/TrackHeaderBox.cs
+++ b/src/JT1078.FMp4/Boxs/TrackHeaderBox.cs
@@ -1,26 +1,71 @@
-using System;
+using JT1078.FMp4.Interfaces;
+using JT1078.FMp4.MessagePack;
+using System;
 using System.Collections.Generic;
 using System.Text;
 
 namespace JT1078.FMp4
 {
-    public class TrackHeaderBox : FullBox
+    public class TrackHeaderBox : FullBox, IFMp4MessagePackFormatter
     {
         public TrackHeaderBox(byte version, uint flags) : base("tkhd", version, flags)
         {
         }
-        public uint CreationTime { get; set; }
-        public uint ModificationTime { get; set; }
+        public ulong CreationTime { get; set; }
+        public ulong ModificationTime { get; set; }
         public uint TrackID { get; set; }
         public uint Reserved1 { get; set; }
-        public uint Duration { get; set; }
+        public ulong Duration { get; set; }
         public uint[] Reserved2 { get; set; } = new uint[2];
-        public ushort Layer { get; set; }
-        public ushort AlternateGroup { get; set; }
-        public ushort Volume { get; set; }
+        public short Layer { get; set; }
+        public short AlternateGroup { get; set; }
+        public bool TrackIsAudio { get; set; } = false;
         public ushort Reserved3 { get; set; }
         public int[] Matrix { get; set; } = new int[9] { 0x00010000, 0, 0, 0, 0x00010000, 0, 0, 0, 0x40000000 };
         public uint Width { get; set; }
         public uint Height { get; set; }
+        public void ToBuffer(ref FMp4MessagePackWriter writer)
+        {
+            Start(ref writer);
+            WriterToBuffer(ref writer);
+            if (Version == 1)
+            {
+                writer.WriteUInt64(CreationTime);
+                writer.WriteUInt64(ModificationTime);
+                writer.WriteUInt32(TrackID);
+                writer.WriteUInt32(Reserved1);
+                writer.WriteUInt64(Duration);
+            }
+            else
+            {
+                writer.WriteUInt32((uint)CreationTime);
+                writer.WriteUInt32((uint)ModificationTime);
+                writer.WriteUInt32(TrackID);
+                writer.WriteUInt32(Reserved1);
+                writer.WriteUInt32((uint)Duration);
+            }
+            foreach(var r in Reserved2)
+            {
+                writer.WriteUInt32(r);
+            }
+            writer.WriteInt16(Layer);
+            writer.WriteInt16(AlternateGroup);
+            if (TrackIsAudio)
+            {
+                writer.WriteInt16(0x0100);
+            }
+            else
+            {
+                writer.WriteInt16(0);
+            }
+            writer.WriteUInt16(Reserved3);
+            foreach (var m in Matrix)
+            {
+                writer.WriteInt32(m);
+            }
+            writer.WriteUInt32(Width);
+            writer.WriteUInt32(Height);
+            End(ref writer);
+        }
     }
 }
diff --git a/src/JT1078.FMp4/FullBox.cs b/src/JT1078.FMp4/FullBox.cs
index 3c9cbc5..36e7df4 100644
--- a/src/JT1078.FMp4/FullBox.cs
+++ b/src/JT1078.FMp4/FullBox.cs
@@ -1,4 +1,6 @@
-using System;
+using JT1078.FMp4.Interfaces;
+using JT1078.FMp4.MessagePack;
+using System;
 using System.Collections.Generic;
 using System.Text;
 
@@ -19,5 +21,14 @@ namespace JT1078.FMp4
         /// bit(24)
         /// </summary>
         public uint Flags { get; set; }
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="writer"></param>
+        protected void WriterToBuffer(ref FMp4MessagePackWriter writer)
+        {
+            writer.WriteByte(Version);
+            writer.WriteUInt24(Flags);
+        }
     }
 }
diff --git a/src/JT1078.FMp4/JT1078.FMp4.xml b/src/JT1078.FMp4/JT1078.FMp4.xml
index 4f8615f..6ff981d 100644
--- a/src/JT1078.FMp4/JT1078.FMp4.xml
+++ b/src/JT1078.FMp4/JT1078.FMp4.xml
@@ -168,6 +168,7 @@
         <member name="P:JT1078.FMp4.MediaHeaderBox.Language">
             <summary>
             ISO-639-2/T language code
+            ref:doc\fmp4\ISO Language Codes.txt
             und-undetermined
             </summary>
         </member>
@@ -358,6 +359,12 @@
             bit(24)
             </summary>
         </member>
+        <member name="M:JT1078.FMp4.FullBox.WriterToBuffer(JT1078.FMp4.MessagePack.FMp4MessagePackWriter@)">
+            <summary>
+            
+            </summary>
+            <param name="writer"></param>
+        </member>
         <member name="M:JT1078.FMp4.MessagePack.FMp4MessagePackReader.ReadIso639">
             <summary>
             
@@ -368,7 +375,6 @@
         <member name="M:JT1078.FMp4.MessagePack.FMp4MessagePackWriter.WriteIso639(System.String)">
             <summary>
             ref
-            <see cref="!:https://github.com/sannies/JT1078.FMp4/blob/master/isoparser/src/main/java/org/JT1078.FMp4/tools/IsoTypeWriter.java"/>
             </summary>
             <param name="language"></param>
         </member>
@@ -382,12 +388,17 @@
             盒子类型
             </summary>
         </member>
-        <member name="M:JT1078.FMp4.Mp4Box.ToBuffer(JT1078.FMp4.MessagePack.FMp4MessagePackWriter@,System.Int32@)">
+        <member name="M:JT1078.FMp4.Mp4Box.Start(JT1078.FMp4.MessagePack.FMp4MessagePackWriter@)">
+            <summary>
+            
+            </summary>
+            <param name="writer"></param>
+        </member>
+        <member name="M:JT1078.FMp4.Mp4Box.End(JT1078.FMp4.MessagePack.FMp4MessagePackWriter@)">
             <summary>
             
             </summary>
             <param name="writer"></param>
-            <param name="sizePosition"></param>
         </member>
         <!-- Badly formed XML comment ignored for member "P:JT1078.FMp4.Samples.AudioSampleEntry.Samplerate" -->
     </members>
diff --git a/src/JT1078.FMp4/MessagePack/FMp4MessagePackWriter.cs b/src/JT1078.FMp4/MessagePack/FMp4MessagePackWriter.cs
index 9dc34df..40bb399 100644
--- a/src/JT1078.FMp4/MessagePack/FMp4MessagePackWriter.cs
+++ b/src/JT1078.FMp4/MessagePack/FMp4MessagePackWriter.cs
@@ -28,6 +28,11 @@ namespace JT1078.FMp4.MessagePack
             BinaryPrimitives.WriteUInt16BigEndian(writer.Free, value);
             writer.Advance(2);
         }
+        public void WriteInt16(short value)
+        {
+            BinaryPrimitives.WriteInt16BigEndian(writer.Free, value);
+            writer.Advance(2);
+        }
         public void WriteInt32(int value)
         {
             BinaryPrimitives.WriteInt32BigEndian(writer.Free, value);
@@ -44,6 +49,15 @@ namespace JT1078.FMp4.MessagePack
             writer.Advance(4);
         }
 
+        public void WriteUInt24(uint value)
+        {
+            var span = writer.Free;
+            span[0] = (byte)(value >> 16);
+            span[1] = (byte)(value >> 8);
+            span[2] = (byte)value;
+            writer.Advance(3);
+        }
+
         public void WriteASCII(string value)
         {
             var data = Encoding.ASCII.GetBytes(value);
@@ -88,7 +102,6 @@ namespace JT1078.FMp4.MessagePack
 
         /// <summary>
         /// ref
-        /// <see cref="https://github.com/sannies/JT1078.FMp4/blob/master/isoparser/src/main/java/org/JT1078.FMp4/tools/IsoTypeWriter.java"/>
         /// </summary>
         /// <param name="language"></param>
         public void  WriteIso639(string language)
diff --git a/src/JT1078.FMp4/Mp4Box.cs b/src/JT1078.FMp4/Mp4Box.cs
index 326f907..2bedc2d 100644
--- a/src/JT1078.FMp4/Mp4Box.cs
+++ b/src/JT1078.FMp4/Mp4Box.cs
@@ -1,4 +1,5 @@
-using JT1078.FMp4.MessagePack;
+using JT1078.FMp4.Interfaces;
+using JT1078.FMp4.MessagePack;
 using System;
 using System.Collections.Generic;
 using System.Text;
@@ -9,7 +10,7 @@ namespace JT1078.FMp4
     {
         //public const string UUID = "uuid";
 
-        public const int FixedSizeLength = 4;
+        const int FixedSizeLength = 4;
 
         public Mp4Box(string boxType)
         {
@@ -49,15 +50,25 @@ namespace JT1078.FMp4
         ///// </summary>
         //public string UserType { get; set; }
 
+        private int sizePosition;
+
         /// <summary>
         /// 
         /// </summary>
         /// <param name="writer"></param>
-        /// <param name="sizePosition"></param>
-        public void ToBuffer(ref FMp4MessagePackWriter writer, out int sizePosition)
+        public void Start(ref FMp4MessagePackWriter writer)
         {
             writer.Skip(FixedSizeLength, out sizePosition);
             writer.WriteASCII(BoxType);
         }
+        
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="writer"></param>
+        public void End(ref FMp4MessagePackWriter writer)
+        {
+            writer.WriteUInt32Return((uint)(writer.GetCurrentPosition() - sizePosition), sizePosition);
+        }
     }
 }