diff --git a/.gitignore b/.gitignore
index 47e7f0c..63be598 100644
--- a/.gitignore
+++ b/.gitignore
@@ -334,3 +334,4 @@ ASALocalRun/
 /doc/tools/FlvAnalyzer.exe
 /doc/tools/EasyICE_2.7.0.2
 /doc/tools/mp4parse
+/doc/tools/mp4info.exe
diff --git a/doc/video/fragmented_demo_trun.txt b/doc/video/fragmented_demo_trun.txt
new file mode 100644
index 0000000..4c48896
--- /dev/null
+++ b/doc/video/fragmented_demo_trun.txt
@@ -0,0 +1,105 @@
+0000bb80000066ee0000a081000017ea
+
+0000a081000009740000a081000003970000a0820000037b0000a081000031c5
+
+0000a08100000bbb0000a081000004230000a0810000052f0000a0820000349b
+
+0000a08100000e250000a0810000054e0000a08100000a160000a08100000e6b
+
+0000a08200000cf20000a08100000be20000a081000004640000a08100000df6
+
+0000a081000005e80000a082000002a20000a081000002730000a0810000170b
+
+0000a081000005540000a081000002a10000a0820000036a0000a081000025e5
+
+0000a08100000c7b0000a081000003890000a081000006ab0000a0820000310d
+
+0000a081000015240000a0810000071f0000a08100000b250000a08100003c7b
+
+0000a08200001b660000a08100000c640000a08100000f3f0000a0810000393b
+
+0000a081000017eb0000a082000010530000a081000010510000a0810000332e
+
+0000a081000016ca0000a08100000f520000a08200000e180000a08100002f6b
+
+0000a081000015f20000a08100000ce00000a08100000bee0000a08200002a12
+
+0000a081000010820000a081000009c20000a081000009850000a08100002998
+
+0000a082000010d10000a0810000084f0000a081000007870000a0810000284d
+
+0000a08100000d350000a0820000074f0000a081000007950000a081000026d0
+
+0000a08100000dcf0000a081000007800000a0820000079f0000a0810000281d
+
+0000a08100000e440000a0810000080a0000a081000007ee0000a08200002860
+
+0000a08100000fcb0000a081000008030000a081000009bd0000a08100002718
+
+0000a08200000f7e0000a081000008a70000a081000008fc0000a081000027bc
+
+0000a08100000f200000a082000008d30000a081000008ef0000a081000027a6
+
+0000a08100000eb60000a0810000093f0000a082000008ce0000a0810000289e
+
+0000a081000010c30000a08100000a280000a08100000a040000a082000026c7
+
+0000a0810000105b0000a081000009150000a0810000088c0000a0810000270e
+
+0000a08200000ec30000a081000007db0000a081000007480000a08100002278
+
+0000a08100000c270000a082000007c50000a081000006990000a08100001fbc
+
+0000a08100000a650000a0810000058d0000a0820000038f0000a08100002306
+
+0000a08100000cb60000a0810000043a0000a081000008590000a08200002469
+
+0000a0810000108a0000a081000008c90000a081000008b10000a0810000267b
+
+0000a082000011d40000a081000009430000a081000009bd0000a08100002664
+
+0000a08100000e7e0000a082000009db0000a08100002ac40000a081000012e1
+
+0000a08100000abf0000a08100000a320000a082000024fc0000a081000009a8
+
+0000a0810000210d0000a0810000260b0000a08100000a790000a0820000243d
+
+0000a08100000b970000a081000024570000a08100000b3b0000a08100002197
+
+0000a08200000a0f0000a08100001e270000a081000025c70000a08100000aef
+
+0000a08100001bd50000a08200001d9f0000a081000021060000a0810000208c
+
+0000a0810000098d0000a081000022060000a08200000e260000a08100000993
+
+0000a0810000237d0000a08100000e8e0000a081000008e60000a082000007db
+
+0000a081000020950000a08100000c970000a081000007460000a0810000050f
+
+0000a08200001ddd0000a081000009390000a0810000044b0000a08100000451
+
+0000a08100001b1c0000a0820000088a0000a081000003b40000a08100000384
+
+0000a0810000193c0000a081000007940000a082000004670000a0810000039b
+
+0000a08100001a6f0000a081000008290000a081000004370000a08200000466
+
+0000a08100001a8f0000a08100000aac0000a0810000042d0000a08100000438
+
+0000a08200001a290000a081000009ce0000a081000004460000a0810000043a
+
+0000a08100001a8d0000a08200000b570000a081000004770000a08100000523
+
+0000a08100001cdb0000a0810000087a0000a082000004b70000a08100000499
+
+0000a08100001c750000a0810000097f0000a081000005510000a082000004f3
+
+0000a08100001f0f0000a081000009790000a0810000054b0000a0810000053d
+
+0000a082000021e00000a08100000cc00000a081000005840000a08100000561
+
+0000a081000021a20000a08200000aa60000a081000004ef0000a081000005c9
+
+0000a08100001f840000a08100000d7a0000a08200000a390000a0810000064f
+
+0000a081000020d30000a08100000b0a
\ No newline at end of file
diff --git a/src/JT1078.FMp4.Test/FMP4/placeholder.txt b/src/JT1078.FMp4.Test/FMP4/placeholder.txt
new file mode 100644
index 0000000..c3833e4
--- /dev/null
+++ b/src/JT1078.FMp4.Test/FMP4/placeholder.txt
@@ -0,0 +1 @@
+placeholder
\ No newline at end of file
diff --git a/src/JT1078.FMp4.Test/FMp4Box_Test.cs b/src/JT1078.FMp4.Test/FMp4Box_Test.cs
index 4c1f364..dfd37b9 100644
--- a/src/JT1078.FMp4.Test/FMp4Box_Test.cs
+++ b/src/JT1078.FMp4.Test/FMp4Box_Test.cs
@@ -272,7 +272,25 @@ namespace JT1078.FMp4.Test
             //moof->tfdt
             movieFragmentBox.TrackFragmentBox.TrackFragmentBaseMediaDecodeTimeBox = new TrackFragmentBaseMediaDecodeTimeBox();
             //todo:moof->trun
+            //000006987472756E00000305000000D0000006F802000000
+            //00 00 06 98
+            //74 72 75 6E
+            //00
+            //00 03 05
+            //00 00 00 D0                           SampleCount
+            //00 00 06 F8                           DataOffset
+            //02 00 00 00                           FirstSampleFlags
+            //fragmented_demo_trun.txt              TrackRunInfos
             movieFragmentBox.TrackFragmentBox.TrackRunBox = new TrackRunBox(0, 0x00000305);
+            movieFragmentBox.TrackFragmentBox.TrackRunBox.SampleCount = 0x000000D0;
+            movieFragmentBox.TrackFragmentBox.TrackRunBox.DataOffset = 0x000006F8;
+            movieFragmentBox.TrackFragmentBox.TrackRunBox.FirstSampleFlags = 0x02000000;
+            movieFragmentBox.TrackFragmentBox.TrackRunBox.TrackRunInfos = new List<TrackRunBox.TrackRunInfo>();
+            var lines = File.ReadAllLines(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "FMP4", "fragmented_demo_trun.txt"));
+            var buffers = lines.Where(w => !string.IsNullOrEmpty(w)).Select(s => s.ToHexBytes()).ToList();
+            List<byte> data = new List<byte>();
+            //SampleDuration
+            //SampleSize
         }
         /// <summary>
         /// 使用doc/video/fragmented_demo.mp4
@@ -281,7 +299,7 @@ namespace JT1078.FMp4.Test
         public void mdat_test()
         {
             MediaDataBox mediaDataBox = new MediaDataBox();
-            var lines = File.ReadAllLines(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "H264", "fragmented_demo_mdat.txt"));
+            var lines = File.ReadAllLines(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "FMP4", "fragmented_demo_mdat.txt"));
             var buffers = lines.Where(w => !string.IsNullOrEmpty(w)).Select(s => s.ToHexBytes()).ToList();
             List<byte> data = new List<byte>();
             foreach (var buffer in buffers)
diff --git a/src/JT1078.FMp4.Test/JT1078.FMp4.Test.csproj b/src/JT1078.FMp4.Test/JT1078.FMp4.Test.csproj
index 19109a0..1937a79 100644
--- a/src/JT1078.FMp4.Test/JT1078.FMp4.Test.csproj
+++ b/src/JT1078.FMp4.Test/JT1078.FMp4.Test.csproj
@@ -23,13 +23,18 @@
     <ProjectReference Include="..\JT1078.FMp4\JT1078.FMp4.csproj" />
   </ItemGroup>
   <ItemGroup>
-    <Folder Include="H264\" />
-    <None Include="..\..\doc\video\fragmented_demo_mdat.txt" Link="H264\fragmented_demo_mdat.txt">
+    <None Include="..\..\doc\video\fragmented_demo_mdat.txt" Link="FMP4\fragmented_demo_mdat.txt">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>   
+    <None Include="..\..\doc\video\fragmented_demo_trun.txt" Link="FMP4\fragmented_demo_trun.txt">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
   </ItemGroup>
   <ItemGroup>
-    <None Update="H264\fragmented_demo_mdat.txt">
+    <None Update="FMP4\fragmented_demo_mdat.txt">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>   
+    <None Update="FMP4\fragmented_demo_trun.txt">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
   </ItemGroup>
diff --git a/src/JT1078.FMp4/Boxs/TrackHeaderBox.cs b/src/JT1078.FMp4/Boxs/TrackHeaderBox.cs
index 42639e7..05e494a 100644
--- a/src/JT1078.FMp4/Boxs/TrackHeaderBox.cs
+++ b/src/JT1078.FMp4/Boxs/TrackHeaderBox.cs
@@ -18,7 +18,18 @@ namespace JT1078.FMp4
         /// <param name="flags"></param>
         public TrackHeaderBox(byte version, uint flags) : base("tkhd", version, flags)
         {
+            
         }
+
+        /// <summary>
+        /// tkhd
+        /// </summary>
+        /// <param name="version"></param>
+        public TrackHeaderBox(byte version) : base("tkhd", version, (FMp4Constants.TKHD_FLAG_ENABLED | FMp4Constants.TKHD_FLAG_IN_MOVIE | FMp4Constants.TKHD_FLAG_IN_PREVIEW))
+        {
+
+        }
+
         public ulong CreationTime { get; set; }
         public ulong ModificationTime { get; set; }
         public uint TrackID { get; set; }
diff --git a/src/JT1078.FMp4/Boxs/TrackRunBox.cs b/src/JT1078.FMp4/Boxs/TrackRunBox.cs
index 5ec6575..6d1c0d7 100644
--- a/src/JT1078.FMp4/Boxs/TrackRunBox.cs
+++ b/src/JT1078.FMp4/Boxs/TrackRunBox.cs
@@ -16,7 +16,7 @@ namespace JT1078.FMp4
         /// </summary>
         /// <param name="version"></param>
         /// <param name="flags"></param>
-        public TrackRunBox(byte version, uint flags) : base("trun", version, flags)
+        public TrackRunBox(byte version=0, uint flags= 0x000f01) : base("trun", version, flags)
         {
         }
 
@@ -39,7 +39,52 @@ namespace JT1078.FMp4
         {
             Start(ref writer);
             WriterFullBoxToBuffer(ref writer);
-            writer.WriteUInt32(SampleCount);
+            bool tmpFlag = TrackRunInfos != null && TrackRunInfos.Count > 0;
+            if (tmpFlag)
+            {
+                writer.WriteUInt32((uint)TrackRunInfos.Count);
+            }
+            else
+            {
+                writer.WriteUInt32(0);
+            }
+            if((Flags & FMp4Constants.TRUN_FLAG_DATA_OFFSET_PRESENT) > 0)
+            {
+                writer.WriteInt32(DataOffset);
+            }
+            if ((Flags & FMp4Constants.TRUN_FLAG_FIRST_SAMPLE_FLAGS_PRESENT) > 0)
+            {
+                writer.WriteUInt32(FirstSampleFlags);
+            }
+            if (tmpFlag)
+            {
+                foreach(var trun in TrackRunInfos)
+                {
+                    if ((Flags & FMp4Constants.TRUN_FLAG_SAMPLE_DURATION_PRESENT) > 0)
+                    {
+                        writer.WriteUInt32(trun.SampleDuration);
+                    }
+                    if ((Flags & FMp4Constants.TRUN_FLAG_SAMPLE_SIZE_PRESENT) > 0)
+                    {
+                        writer.WriteUInt32(trun.SampleSize);
+                    }
+                    if ((Flags & FMp4Constants.TRUN_FLAG_SAMPLE_FLAGS_PRESENT) > 0)
+                    {
+                        writer.WriteUInt32(trun.SampleFlags);
+                    }
+                    if ((Flags & FMp4Constants.TRUN_FLAG_SAMPLE_COMPOSITION_TIME_OFFSET_PRESENT) > 0)
+                    {
+                        if (Version == 0)
+                        {
+                            writer.WriteUInt32(trun.SampleCompositionTimeOffset);
+                        }
+                        else
+                        {
+                            writer.WriteInt32(trun.SignedSampleCompositionTimeOffset);
+                        }
+                    }
+                }
+            }
             End(ref writer);
         }
 
diff --git a/src/JT1078.FMp4/FMp4Constants.cs b/src/JT1078.FMp4/FMp4Constants.cs
index dfb8eea..a3dc2ea 100644
--- a/src/JT1078.FMp4/FMp4Constants.cs
+++ b/src/JT1078.FMp4/FMp4Constants.cs
@@ -18,55 +18,67 @@ namespace JT1078.FMp4
         /// </summary>
         public static readonly DateTime UTCBaseTime = new DateTime(1904, 1, 1);
         /// <summary>
-        /// 
+        /// TKHD_FLAG_ENABLED
+        /// </summary>
+        public const int TKHD_FLAG_ENABLED = 0x000001;
+        /// <summary>
+        /// TKHD_FLAG_IN_MOVIE
+        /// </summary>
+        public const int TKHD_FLAG_IN_MOVIE = 0x000002;
+        /// <summary>                                                                      
+        /// TKHD_FLAG_IN_PREVIEW                                                    
+        /// </summary>
+        public const int TKHD_FLAG_IN_PREVIEW = 0x000004;
+        /// <summary>
+        /// TFHD_FLAG_BASE_DATA_OFFSET
         /// </summary>
         public const int TFHD_FLAG_BASE_DATA_OFFSET = 0x00000001;
         /// <summary>
-        /// 
+        /// TFHD_FLAG_SAMPLE_DESC
         /// </summary>
         public const int TFHD_FLAG_SAMPLE_DESCRIPTION_INDEX = 0x00000002;
         /// <summary>
-        /// 
+        /// TFHD_FLAG_SAMPLE_DUR
         /// </summary>
         public const int TFHD_FLAG_DEFAULT_DURATION = 0x00000008;
         /// <summary>
-        /// 
+        /// TFHD_FLAG_SAMPLE_SIZE
         /// </summary>
         public const int TFHD_FLAG_DEFAULT_SIZE = 0x00000010;
         /// <summary>
-        /// 
+        /// TFHD_FLAG_SAMPLE_FLAGS
         /// </summary>
         public const int TFHD_FLAG_DEFAULT_FLAGS = 0x00000020;
         /// <summary>
-        /// 
+        /// TFHD_FLAG_DUR_EMPTY
         /// </summary>
         public const int TFHD_FLAG_DURATION_IS_EMPTY = 0x00010000;
         /// <summary>
-        /// 
+        /// TFHD_FLAG_DEFAULT_BASE_IS_MOOF
         /// </summary>
         public const int TFHD_FLAG_DEFAULT_BASE_IS_MOOF = 0x00020000;
         /// <summary>
-        /// 
+        /// TRUN_FLAGS_DATA_OFFSET
         /// </summary>
         public const int TRUN_FLAG_DATA_OFFSET_PRESENT = 0x0001;
         /// <summary>
-        /// 
+        /// TRUN_FLAGS_FIRST_FLAG
         /// </summary>
         public const int TRUN_FLAG_FIRST_SAMPLE_FLAGS_PRESENT = 0x0004;
         /// <summary>
-        /// 
+        /// TRUN_FLAGS_DURATION
         /// </summary>
         public const int TRUN_FLAG_SAMPLE_DURATION_PRESENT = 0x0100;
         /// <summary>
-        /// 
+        /// TRUN_FLAGS_SIZE
         /// </summary>
         public const int TRUN_FLAG_SAMPLE_SIZE_PRESENT = 0x0200;
         /// <summary>
-        /// 
+        /// TRUN_FLAGS_FLAGS
         /// </summary>
         public const int TRUN_FLAG_SAMPLE_FLAGS_PRESENT = 0x0400;
         /// <summary>
-        /// 
+        /// TRUN_FLAGS_CTS_OFFSET
         /// </summary>
         public const int TRUN_FLAG_SAMPLE_COMPOSITION_TIME_OFFSET_PRESENT = 0x0800;
     }
diff --git a/src/JT1078.FMp4/JT1078.FMp4.xml b/src/JT1078.FMp4/JT1078.FMp4.xml
index 413ac6c..b53b130 100644
--- a/src/JT1078.FMp4/JT1078.FMp4.xml
+++ b/src/JT1078.FMp4/JT1078.FMp4.xml
@@ -932,6 +932,12 @@
             <param name="version"></param>
             <param name="flags"></param>
         </member>
+        <member name="M:JT1078.FMp4.TrackHeaderBox.#ctor(System.Byte)">
+            <summary>
+            tkhd
+            </summary>
+            <param name="version"></param>
+        </member>
         <member name="T:JT1078.FMp4.TrackRunBox">
             <summary>
             trun
@@ -1071,69 +1077,84 @@
             
             </summary>
         </member>
+        <member name="F:JT1078.FMp4.FMp4Constants.TKHD_FLAG_ENABLED">
+            <summary>
+            TKHD_FLAG_ENABLED
+            </summary>
+        </member>
+        <member name="F:JT1078.FMp4.FMp4Constants.TKHD_FLAG_IN_MOVIE">
+            <summary>
+            TKHD_FLAG_IN_MOVIE
+            </summary>
+        </member>
+        <member name="F:JT1078.FMp4.FMp4Constants.TKHD_FLAG_IN_PREVIEW">
+            <summary>                                                                      
+            TKHD_FLAG_IN_PREVIEW                                                    
+            </summary>
+        </member>
         <member name="F:JT1078.FMp4.FMp4Constants.TFHD_FLAG_BASE_DATA_OFFSET">
             <summary>
-            
+            TFHD_FLAG_BASE_DATA_OFFSET
             </summary>
         </member>
         <member name="F:JT1078.FMp4.FMp4Constants.TFHD_FLAG_SAMPLE_DESCRIPTION_INDEX">
             <summary>
-            
+            TFHD_FLAG_SAMPLE_DESC
             </summary>
         </member>
         <member name="F:JT1078.FMp4.FMp4Constants.TFHD_FLAG_DEFAULT_DURATION">
             <summary>
-            
+            TFHD_FLAG_SAMPLE_DUR
             </summary>
         </member>
         <member name="F:JT1078.FMp4.FMp4Constants.TFHD_FLAG_DEFAULT_SIZE">
             <summary>
-            
+            TFHD_FLAG_SAMPLE_SIZE
             </summary>
         </member>
         <member name="F:JT1078.FMp4.FMp4Constants.TFHD_FLAG_DEFAULT_FLAGS">
             <summary>
-            
+            TFHD_FLAG_SAMPLE_FLAGS
             </summary>
         </member>
         <member name="F:JT1078.FMp4.FMp4Constants.TFHD_FLAG_DURATION_IS_EMPTY">
             <summary>
-            
+            TFHD_FLAG_DUR_EMPTY
             </summary>
         </member>
         <member name="F:JT1078.FMp4.FMp4Constants.TFHD_FLAG_DEFAULT_BASE_IS_MOOF">
             <summary>
-            
+            TFHD_FLAG_DEFAULT_BASE_IS_MOOF
             </summary>
         </member>
         <member name="F:JT1078.FMp4.FMp4Constants.TRUN_FLAG_DATA_OFFSET_PRESENT">
             <summary>
-            
+            TRUN_FLAGS_DATA_OFFSET
             </summary>
         </member>
         <member name="F:JT1078.FMp4.FMp4Constants.TRUN_FLAG_FIRST_SAMPLE_FLAGS_PRESENT">
             <summary>
-            
+            TRUN_FLAGS_FIRST_FLAG
             </summary>
         </member>
         <member name="F:JT1078.FMp4.FMp4Constants.TRUN_FLAG_SAMPLE_DURATION_PRESENT">
             <summary>
-            
+            TRUN_FLAGS_DURATION
             </summary>
         </member>
         <member name="F:JT1078.FMp4.FMp4Constants.TRUN_FLAG_SAMPLE_SIZE_PRESENT">
             <summary>
-            
+            TRUN_FLAGS_SIZE
             </summary>
         </member>
         <member name="F:JT1078.FMp4.FMp4Constants.TRUN_FLAG_SAMPLE_FLAGS_PRESENT">
             <summary>
-            
+            TRUN_FLAGS_FLAGS
             </summary>
         </member>
         <member name="F:JT1078.FMp4.FMp4Constants.TRUN_FLAG_SAMPLE_COMPOSITION_TIME_OFFSET_PRESENT">
             <summary>
-            
+            TRUN_FLAGS_CTS_OFFSET
             </summary>
         </member>
         <member name="P:JT1078.FMp4.FullBox.Version">