diff --git a/BililiveRecorder.Flv/BinaryConvertUtilities.cs b/BililiveRecorder.Flv/BinaryConvertUtilities.cs
new file mode 100644
index 0000000..56c3b5e
--- /dev/null
+++ b/BililiveRecorder.Flv/BinaryConvertUtilities.cs
@@ -0,0 +1,66 @@
+using System;
+using System.IO;
+
+namespace BililiveRecorder.Flv
+{
+    internal static class BinaryConvertUtilities
+    {
+        private static readonly uint[] _lookup32 = CreateLookup32();
+
+        private static uint[] CreateLookup32()
+        {
+            var result = new uint[256];
+            for (var i = 0; i < 256; i++)
+            {
+                var s = i.ToString("X2");
+                result[i] = s[0] + ((uint)s[1] << 16);
+            }
+            return result;
+        }
+
+        internal static string ByteArrayToHexString(byte[] bytes) => ByteArrayToHexString(bytes, 0, bytes.Length);
+
+        internal static string ByteArrayToHexString(byte[] bytes, int start, int length)
+        {
+            var lookup32 = _lookup32;
+            var result = new char[length * 2];
+            for (var i = start; i < length; i++)
+            {
+                var val = lookup32[bytes[i]];
+                result[2 * i] = (char)val;
+                result[2 * i + 1] = (char)(val >> 16);
+            }
+            return new string(result);
+        }
+
+        internal static byte[] HexStringToByteArray(string hex)
+        {
+            var bytes = new byte[hex.Length / 2];
+            for (var i = 0; i < hex.Length; i += 2)
+                bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
+            return bytes;
+        }
+
+        internal static string StreamToHexString(Stream stream)
+        {
+            var lookup32 = _lookup32;
+            stream.Seek(0, SeekOrigin.Begin);
+            var result = new char[stream.Length * 2];
+            for (var i = 0; i < stream.Length; i++)
+            {
+                var val = lookup32[stream.ReadByte()];
+                result[2 * i] = (char)val;
+                result[2 * i + 1] = (char)(val >> 16);
+            }
+            return new string(result);
+        }
+
+        internal static MemoryStream HexStringToMemoryStream(string hex)
+        {
+            var stream = new MemoryStream(hex.Length / 2);
+            for (var i = 0; i < hex.Length; i += 2)
+                stream.WriteByte(Convert.ToByte(hex.Substring(i, 2), 16));
+            return stream;
+        }
+    }
+}
diff --git a/BililiveRecorder.Flv/Int24.cs b/BililiveRecorder.Flv/Int24.cs
new file mode 100644
index 0000000..b444073
--- /dev/null
+++ b/BililiveRecorder.Flv/Int24.cs
@@ -0,0 +1,58 @@
+using System;
+using System.Buffers;
+using System.Buffers.Binary;
+
+namespace BililiveRecorder.Flv
+{
+    public class Int24
+    {
+        public static int ReadInt24(ReadOnlySpan<byte> source)
+        {
+            if (source.Length < 3)
+                throw new ArgumentException("source must longer than 3 bytes", nameof(source));
+
+            const int mask = -16777216;
+            var buffer = ArrayPool<byte>.Shared.Rent(4);
+            try
+            {
+                buffer[0] = 0;
+                buffer[1] = source[0];
+                buffer[2] = source[1];
+                buffer[3] = source[2];
+
+                var value = BinaryPrimitives.ReadInt32BigEndian(buffer);
+
+                if ((value & 0x00800000) > 0)
+                    value |= mask;
+                else
+                    value &= ~mask;
+
+                return value;
+            }
+            finally
+            {
+                ArrayPool<byte>.Shared.Return(buffer);
+            }
+        }
+
+        public static void WriteInt24(Span<byte> destination, int value)
+        {
+            if (value is > 8388607 or < -8388608)
+                throw new ArgumentOutOfRangeException(nameof(value), "int24 should be between -8388608 and 8388607");
+
+            var buffer = ArrayPool<byte>.Shared.Rent(4);
+            try
+            {
+                BinaryPrimitives.WriteInt32BigEndian(buffer, value);
+
+                destination[0] = buffer[1];
+                destination[1] = buffer[2];
+                destination[2] = buffer[3];
+            }
+            finally
+            {
+                ArrayPool<byte>.Shared.Return(buffer);
+            }
+        }
+    }
+}
diff --git a/BililiveRecorder.Flv/Parser/FlvTagPipeReader.cs b/BililiveRecorder.Flv/Parser/FlvTagPipeReader.cs
index 54e02d0..6b959f7 100644
--- a/BililiveRecorder.Flv/Parser/FlvTagPipeReader.cs
+++ b/BililiveRecorder.Flv/Parser/FlvTagPipeReader.cs
@@ -57,7 +57,7 @@ namespace BililiveRecorder.Flv.Parser
         /// 实现二进制数据的解析
         /// </summary>
         /// <returns>解析出的 Flv Tag</returns>
-        private async Task<Tag?> ReadNextTagAsync(CancellationToken cancellationToken = default)
+        private async Task<Tag?> ReadNextTagAsync(CancellationToken cancellationToken)
         {
             while (true)
             {
@@ -291,11 +291,15 @@ namespace BililiveRecorder.Flv.Parser
                     tag.Nalus = nalus;
             }
 
+            tag.BinaryData = tagBodyStream;
+            tag.UpdateExtraData();
+
             // Dispose Stream If Not Needed
-            if (!this.skipData || tag.ShouldSerializeBinaryDataForSerializationUseOnly())
-                tag.BinaryData = tagBodyStream;
-            else
+            if (this.skipData && !tag.ShouldSerializeBinaryDataForSerializationUseOnly())
+            {
+                tag.BinaryData = null;
                 tagBodyStream.Dispose();
+            }
 
             return true;
         }
diff --git a/BililiveRecorder.Flv/Pipeline/IProcessingPipelineBuilderExtensions.cs b/BililiveRecorder.Flv/Pipeline/IProcessingPipelineBuilderExtensions.cs
index 9e44e1a..f96d88e 100644
--- a/BililiveRecorder.Flv/Pipeline/IProcessingPipelineBuilderExtensions.cs
+++ b/BililiveRecorder.Flv/Pipeline/IProcessingPipelineBuilderExtensions.cs
@@ -26,7 +26,7 @@ namespace BililiveRecorder.Flv.Pipeline
             builder
             .Add<HandleEndTagRule>()
             .Add<HandleDelayedAudioHeaderRule>()
-            //.Add<UpdateCompositionTimeRule>()
+            .Add<UpdateCompositionTimeRule>()
             .Add<UpdateTimestampOffsetRule>()
             .Add<UpdateTimestampJumpRule>()
             .Add<HandleNewScriptRule>()
diff --git a/BililiveRecorder.Flv/Pipeline/Rules/UpdateCompositionTimeRule.cs b/BililiveRecorder.Flv/Pipeline/Rules/UpdateCompositionTimeRule.cs
index a4ccea9..5a98dd6 100644
--- a/BililiveRecorder.Flv/Pipeline/Rules/UpdateCompositionTimeRule.cs
+++ b/BililiveRecorder.Flv/Pipeline/Rules/UpdateCompositionTimeRule.cs
@@ -1,4 +1,7 @@
 using System;
+using System.Collections.Generic;
+using System.Linq;
+using BililiveRecorder.Flv.Pipeline.Actions;
 
 namespace BililiveRecorder.Flv.Pipeline.Rules
 {
@@ -6,7 +9,55 @@ namespace BililiveRecorder.Flv.Pipeline.Rules
     {
         public void Run(FlvProcessingContext context, Action next)
         {
+            context.PerActionRun(this.RunPerAction);
             next();
         }
+
+        private IEnumerable<PipelineAction?> RunPerAction(FlvProcessingContext context, PipelineAction action)
+        {
+            if (action is not PipelineDataAction data)
+            {
+                yield return action;
+                yield break;
+            }
+
+            var videoTags = data.Tags.Where(x => x.Type == TagType.Video);
+
+            if (!videoTags.Any())
+            {
+                // skip
+                yield return data;
+                yield break;
+            }
+
+            if (videoTags.Any(x => x.ExtraData is null))
+            {
+                context.AddComment(new ProcessingComment(CommentType.Unrepairable, "有 Tag 的 ExtraData 为 null，请检查文件或联系开发者"));
+                yield break;
+            }
+
+            var compositionOffset = videoTags.Min(x => x.ExtraData!.CompositionTime);
+
+            if (compositionOffset is <= 0 or >= int.MaxValue)
+            {
+                // skip
+                yield return data;
+                yield break;
+            }
+            else
+            {
+                foreach (var tag in data.Tags)
+                {
+                    if (tag.Type != TagType.Video)
+                        continue;
+
+                    System.Diagnostics.Debug.WriteLine("CompositionOffset: " + compositionOffset);
+                    tag.ExtraData!.CompositionTime -= compositionOffset;
+                    tag.Timestamp += compositionOffset;
+                }
+                yield return data;
+                yield break;
+            }
+        }
     }
 }
diff --git a/BililiveRecorder.Flv/Tag.cs b/BililiveRecorder.Flv/Tag.cs
index 5b673cc..7b4aa7b 100644
--- a/BililiveRecorder.Flv/Tag.cs
+++ b/BililiveRecorder.Flv/Tag.cs
@@ -1,6 +1,4 @@
 using System;
-using System.Buffers;
-using System.Buffers.Binary;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Diagnostics;
@@ -8,7 +6,6 @@ using System.IO;
 using System.Runtime.CompilerServices;
 using System.Xml.Serialization;
 using BililiveRecorder.Flv.Amf;
-using FastHashes;
 
 namespace BililiveRecorder.Flv
 {
@@ -108,79 +105,6 @@ namespace BililiveRecorder.Flv
             };
         }
 
-        private static readonly FarmHash64 farmHash64 = new();
-
-        public TagExtraData? UpdateExtraData()
-        {
-            if (this.BinaryData is not { } binaryData || binaryData.Length < 5)
-            {
-                this.ExtraData = null;
-            }
-            else
-            {
-                var old_position = binaryData.Position;
-                var extra = new TagExtraData();
-
-                binaryData.Position = 0;
-
-                var buffer = ArrayPool<byte>.Shared.Rent(5);
-                try
-                {
-                    binaryData.Read(buffer, 0, 5);
-                    extra.FirstBytes = BinaryConvertUtilities.ByteArrayToHexString(buffer, 0, 2);
-
-                    if (this.Type == TagType.Video)
-                    {
-                        buffer[1] = 0;
-
-                        const int mask = -16777216;
-                        var value = BinaryPrimitives.ReadInt32BigEndian(buffer.AsSpan(1));
-                        if ((value & 0x00800000) > 0)
-                            value |= mask;
-                        else
-                            value &= ~mask;
-
-                        extra.CompositionTime = value;
-                        extra.FinalTime = this.Timestamp + value;
-                    }
-                    else
-                    {
-                        extra.CompositionTime = int.MinValue;
-                    }
-                }
-                finally
-                {
-                    ArrayPool<byte>.Shared.Return(buffer);
-                }
-
-                binaryData.Position = old_position;
-                this.ExtraData = extra;
-            }
-            return this.ExtraData;
-        }
-
-        public string? UpdateDataHash()
-        {
-            if (this.BinaryData is null)
-            {
-                this.DataHash = null;
-            }
-            else
-            {
-                var buffer = this.BinaryData.GetBuffer();
-                this.DataHash = BinaryConvertUtilities.ByteArrayToHexString(farmHash64.ComputeHash(buffer, (int)this.BinaryData.Length));
-
-                if (this.Nalus?.Count > 0)
-                {
-                    foreach (var nalu in this.Nalus)
-                    {
-                        nalu.NaluHash = BinaryConvertUtilities.ByteArrayToHexString(farmHash64.ComputeHash(buffer, nalu.StartPosition, (int)nalu.FullSize));
-                    }
-                }
-            }
-            return this.DataHash;
-        }
-
         private string DebuggerDisplay => string.Format("{0}, {1}{2}{3}, TS={4}, Size={5}",
             this.Type switch
             {
@@ -194,66 +118,5 @@ namespace BililiveRecorder.Flv
             this.Flag.HasFlag(TagFlag.End) ? "E" : "-",
             this.Timestamp,
             this.Size);
-
-        private static class BinaryConvertUtilities
-        {
-            private static readonly uint[] _lookup32 = CreateLookup32();
-
-            private static uint[] CreateLookup32()
-            {
-                var result = new uint[256];
-                for (var i = 0; i < 256; i++)
-                {
-                    var s = i.ToString("X2");
-                    result[i] = s[0] + ((uint)s[1] << 16);
-                }
-                return result;
-            }
-
-            internal static string ByteArrayToHexString(byte[] bytes) => ByteArrayToHexString(bytes, 0, bytes.Length);
-
-            internal static string ByteArrayToHexString(byte[] bytes, int start, int length)
-            {
-                var lookup32 = _lookup32;
-                var result = new char[length * 2];
-                for (var i = start; i < length; i++)
-                {
-                    var val = lookup32[bytes[i]];
-                    result[2 * i] = (char)val;
-                    result[2 * i + 1] = (char)(val >> 16);
-                }
-                return new string(result);
-            }
-
-            internal static byte[] HexStringToByteArray(string hex)
-            {
-                var bytes = new byte[hex.Length / 2];
-                for (var i = 0; i < hex.Length; i += 2)
-                    bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
-                return bytes;
-            }
-
-            internal static string StreamToHexString(Stream stream)
-            {
-                var lookup32 = _lookup32;
-                stream.Seek(0, SeekOrigin.Begin);
-                var result = new char[stream.Length * 2];
-                for (var i = 0; i < stream.Length; i++)
-                {
-                    var val = lookup32[stream.ReadByte()];
-                    result[2 * i] = (char)val;
-                    result[2 * i + 1] = (char)(val >> 16);
-                }
-                return new string(result);
-            }
-
-            internal static MemoryStream HexStringToMemoryStream(string hex)
-            {
-                var stream = new MemoryStream(hex.Length / 2);
-                for (var i = 0; i < hex.Length; i += 2)
-                    stream.WriteByte(Convert.ToByte(hex.Substring(i, 2), 16));
-                return stream;
-            }
-        }
     }
 }
diff --git a/BililiveRecorder.Flv/TagExtentions.cs b/BililiveRecorder.Flv/TagExtentions.cs
index f7bcbc4..caffc33 100644
--- a/BililiveRecorder.Flv/TagExtentions.cs
+++ b/BililiveRecorder.Flv/TagExtentions.cs
@@ -4,6 +4,7 @@ using System.Buffers.Binary;
 using System.IO;
 using System.Runtime.CompilerServices;
 using System.Threading.Tasks;
+using FastHashes;
 
 namespace BililiveRecorder.Flv
 {
@@ -43,24 +44,34 @@ namespace BililiveRecorder.Flv
             Stream? data = null;
             try
             {
+                // 先准备 Tag 的 body 部分
                 if (tag.IsScript())
                 {
+                    // Script Tag 写入时使用 Script Tag 序列化
                     if (tag.ScriptData is null)
-                        throw new Exception("BinaryData is null");
+                        throw new Exception("ScriptData is null");
 
                     data = memoryStreamProvider?.CreateMemoryStream(nameof(TagExtentions) + ":" + nameof(WriteTo) + ":TagBodyTemp") ?? new MemoryStream();
                     tag.ScriptData.WriteTo(data);
                 }
                 else if (tag.Nalus != null)
                 {
+                    // 如果 Tag 有 Nalu 信息，则按照 Nalus 里面的指示分段复制
+                    // 这个 Tag 一定是 Video
                     if (tag.BinaryData is null)
                         throw new Exception("BinaryData is null");
 
                     data = memoryStreamProvider?.CreateMemoryStream(nameof(TagExtentions) + ":" + nameof(WriteTo) + ":TagBodyTemp") ?? new MemoryStream();
 
                     tag.BinaryData.Seek(0, SeekOrigin.Begin);
-
                     tag.BinaryData.Read(buffer, 0, 5);
+
+                    if (tag.ExtraData is not null)
+                    {
+                        // 如果有 ExtraData 则以这里面的 composition time 为准
+                        Int24.WriteInt24(buffer.AsSpan(2, 3), tag.ExtraData.CompositionTime);
+                    }
+
                     data.Write(buffer, 0, 5);
 
                     foreach (var nalu in tag.Nalus)
@@ -77,12 +88,27 @@ namespace BililiveRecorder.Flv
                     if (tag.BinaryData is null)
                         throw new Exception("BinaryData is null");
 
-                    dispose = false;
-                    data = tag.BinaryData;
+                    if (tag.Type == TagType.Video && tag.ExtraData is not null)
+                    {
+                        // 复制并修改 composition time
+                        data = memoryStreamProvider?.CreateMemoryStream(nameof(TagExtentions) + ":" + nameof(WriteTo) + ":TagBodyTemp") ?? new MemoryStream();
+                        tag.BinaryData.CopyTo(data);
+
+                        Int24.WriteInt24(buffer.AsSpan(0, 3), tag.ExtraData.CompositionTime);
+                        data.Seek(2, SeekOrigin.Begin);
+                        data.Read(buffer, 0, 3);
+                    }
+                    else
+                    {
+                        // 直接复用原数据
+                        dispose = false;
+                        data = tag.BinaryData;
+                    }
                 }
 
                 data.Seek(0, SeekOrigin.Begin);
 
+                // 序列号 Tag 的 header 部分
                 BinaryPrimitives.WriteUInt32BigEndian(new Span<byte>(buffer, 0, 4), (uint)data.Length);
                 buffer[0] = (byte)tag.Type;
 
@@ -100,6 +126,7 @@ namespace BililiveRecorder.Flv
                 buffer[9] = 0;
                 buffer[10] = 0;
 
+                // 写入
                 await target.WriteAsync(buffer, 0, 11).ConfigureAwait(false);
                 await data.CopyToAsync(target).ConfigureAwait(false);
 
@@ -113,5 +140,69 @@ namespace BililiveRecorder.Flv
                     data?.Dispose();
             }
         }
+
+        public static TagExtraData? UpdateExtraData(this Tag tag)
+        {
+            if (tag.BinaryData is not { } binaryData || binaryData.Length < 5)
+            {
+                tag.ExtraData = null;
+            }
+            else
+            {
+                var old_position = binaryData.Position;
+                var extra = new TagExtraData();
+
+                binaryData.Position = 0;
+
+                var buffer = ArrayPool<byte>.Shared.Rent(5);
+                try
+                {
+                    binaryData.Read(buffer, 0, 5);
+                    extra.FirstBytes = BinaryConvertUtilities.ByteArrayToHexString(buffer, 0, 2);
+
+                    if (tag.Type == TagType.Video)
+                    {
+                        extra.CompositionTime = Int24.ReadInt24(buffer.AsSpan(2, 3));
+                        extra.FinalTime = tag.Timestamp + extra.CompositionTime;
+                    }
+                    else
+                    {
+                        extra.CompositionTime = int.MinValue;
+                    }
+                }
+                finally
+                {
+                    ArrayPool<byte>.Shared.Return(buffer);
+                }
+
+                binaryData.Position = old_position;
+                tag.ExtraData = extra;
+            }
+            return tag.ExtraData;
+        }
+
+        private static readonly FarmHash64 farmHash64 = new();
+
+        public static string? UpdateDataHash(this Tag tag)
+        {
+            if (tag.BinaryData is null)
+            {
+                tag.DataHash = null;
+            }
+            else
+            {
+                var buffer = tag.BinaryData.GetBuffer();
+                tag.DataHash = BinaryConvertUtilities.ByteArrayToHexString(farmHash64.ComputeHash(buffer, (int)tag.BinaryData.Length));
+
+                if (tag.Nalus?.Count > 0)
+                {
+                    foreach (var nalu in tag.Nalus)
+                    {
+                        nalu.NaluHash = BinaryConvertUtilities.ByteArrayToHexString(farmHash64.ComputeHash(buffer, nalu.StartPosition, (int)nalu.FullSize));
+                    }
+                }
+            }
+            return tag.DataHash;
+        }
     }
 }
diff --git a/BililiveRecorder.ToolBox/ProcessingRules/StatsRule.cs b/BililiveRecorder.ToolBox/ProcessingRules/StatsRule.cs
index 7a326cd..919c043 100644
--- a/BililiveRecorder.ToolBox/ProcessingRules/StatsRule.cs
+++ b/BililiveRecorder.ToolBox/ProcessingRules/StatsRule.cs
@@ -30,8 +30,7 @@ namespace BililiveRecorder.ToolBox.ProcessingRules
 
                             if (tag.ExtraData is { } extra)
                                 this.frameComposition.Add(extra.CompositionTime);
-                            else if (tag.UpdateExtraData() is { } extra2)
-                                this.frameComposition.Add(extra2.CompositionTime);
+
                         }
                         else if (tag.Type == TagType.Audio && tag.Flag == TagFlag.None)
                         {
diff --git a/BililiveRecorder.ToolBox/Tool/Export/ExportHandler.cs b/BililiveRecorder.ToolBox/Tool/Export/ExportHandler.cs
index ad29d24..aed043e 100644
--- a/BililiveRecorder.ToolBox/Tool/Export/ExportHandler.cs
+++ b/BililiveRecorder.ToolBox/Tool/Export/ExportHandler.cs
@@ -73,7 +73,6 @@ namespace BililiveRecorder.ToolBox.Tool.Export
                         if (tag is null)
                             break;
 
-                        tag.UpdateExtraData();
                         tag.UpdateDataHash();
                         if (!tag.ShouldSerializeBinaryDataForSerializationUseOnly())
                             tag.BinaryData?.Dispose();
diff --git a/test/BililiveRecorder.Flv.Tests/Expectations/FlvGrouping/GroupingFromFlv.Output_path=sample.flv.verified.txt b/test/BililiveRecorder.Flv.Tests/Expectations/FlvGrouping/GroupingFromFlv.Output_path=sample.flv.verified.txt
index 7e161fc..cc120be 100644
--- a/test/BililiveRecorder.Flv.Tests/Expectations/FlvGrouping/GroupingFromFlv.Output_path=sample.flv.verified.txt
+++ b/test/BililiveRecorder.Flv.Tests/Expectations/FlvGrouping/GroupingFromFlv.Output_path=sample.flv.verified.txt
@@ -57,6 +57,9 @@
             }
           }
         ]
+      },
+      ExtraData: {
+        FirstBytes: 0200
       }
     },
     Name: PipelineScriptAction
@@ -68,6 +71,9 @@
         Flag: Header, Keyframe,
         Index: 2,
         Size: 49,
+        ExtraData: {
+          FirstBytes: 1700
+        },
         BinaryDataForSerializationUseOnly: 170000000001640015FFE1001C67640015ACD941B1FE4F016A02020280000003008000001E478B16CB01000568EF82BCB0
       },
       {
@@ -75,6 +81,9 @@
         Flag: Header,
         Index: 3,
         Size: 7,
+        ExtraData: {
+          FirstBytes: AF00
+        },
         BinaryDataForSerializationUseOnly: AF00119056E500
       }
     ],
@@ -87,6 +96,11 @@
         Flag: Keyframe,
         Index: 4,
         Size: 4795,
+        ExtraData: {
+          FirstBytes: 1701,
+          CompositionTime: 67,
+          FinalTime: 67
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -120,6 +134,11 @@
         Index: 5,
         Size: 579,
         Timestamp: 34,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 66,
+          FinalTime: 100
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -133,6 +152,11 @@
         Index: 6,
         Size: 426,
         Timestamp: 67,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 100,
+          FinalTime: 167
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -145,19 +169,30 @@
         Type: Audio,
         Index: 7,
         Size: 8,
-        Timestamp: 67
+        Timestamp: 67,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 8,
         Size: 8,
-        Timestamp: 88
+        Timestamp: 88,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 9,
         Size: 142,
         Timestamp: 100,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 34,
+          FinalTime: 134
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -170,19 +205,30 @@
         Type: Audio,
         Index: 10,
         Size: 8,
-        Timestamp: 110
+        Timestamp: 110,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 11,
         Size: 8,
-        Timestamp: 131
+        Timestamp: 131,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 12,
         Size: 667,
         Timestamp: 134,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 100,
+          FinalTime: 234
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -195,13 +241,21 @@
         Type: Audio,
         Index: 13,
         Size: 8,
-        Timestamp: 152
+        Timestamp: 152,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 14,
         Size: 149,
         Timestamp: 167,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 33,
+          FinalTime: 200
+        },
         Nalus: [
           {
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         Timestamp: 9267,
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@@ -6360,19 +9067,30 @@
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-        Timestamp: 9304
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         Size: 8,
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         Size: 573,
         Timestamp: 9334,
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@@ -6385,13 +9103,21 @@
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         Type: Video,
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         Size: 259,
         Timestamp: 9367,
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@@ -6404,19 +9130,30 @@
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         Size: 8,
-        Timestamp: 9390
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         Index: 724,
         Size: 166,
         Timestamp: 9400,
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@@ -6429,19 +9166,30 @@
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-        Timestamp: 9411
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         Size: 8,
-        Timestamp: 9432
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         Index: 727,
         Size: 873,
         Timestamp: 9434,
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@@ -6454,13 +9202,21 @@
         Type: Audio,
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         Size: 8,
-        Timestamp: 9454
+        Timestamp: 9454,
+        ExtraData: {
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         Type: Video,
         Index: 729,
         Size: 174,
         Timestamp: 9467,
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@@ -6473,19 +9229,30 @@
         Type: Audio,
         Index: 730,
         Size: 8,
-        Timestamp: 9475
+        Timestamp: 9475,
+        ExtraData: {
+          FirstBytes: AF01
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       {
         Type: Audio,
         Index: 731,
         Size: 8,
-        Timestamp: 9496
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         Index: 732,
         Size: 837,
         Timestamp: 9500,
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+          FinalTime: 9600
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@@ -6498,13 +9265,21 @@
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         Size: 8,
-        Timestamp: 9518
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         Type: Video,
         Index: 734,
         Size: 187,
         Timestamp: 9534,
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@@ -6517,19 +9292,30 @@
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         Size: 8,
-        Timestamp: 9539
+        Timestamp: 9539,
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       {
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         Size: 8,
-        Timestamp: 9560
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       {
         Type: Video,
         Index: 737,
         Size: 825,
         Timestamp: 9567,
+        ExtraData: {
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+          CompositionTime: 100,
+          FinalTime: 9667
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@@ -6542,13 +9328,21 @@
         Type: Audio,
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-        Timestamp: 9582
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+        ExtraData: {
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       {
         Type: Video,
         Index: 739,
         Size: 199,
         Timestamp: 9600,
+        ExtraData: {
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+          FinalTime: 9634
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@@ -6561,19 +9355,30 @@
         Type: Audio,
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         Size: 8,
-        Timestamp: 9603
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+        ExtraData: {
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+        }
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       {
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         Index: 741,
         Size: 8,
-        Timestamp: 9624
+        Timestamp: 9624,
+        ExtraData: {
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       {
         Type: Video,
         Index: 742,
         Size: 502,
         Timestamp: 9634,
+        ExtraData: {
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+          CompositionTime: 133,
+          FinalTime: 9767
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@@ -6586,13 +9391,21 @@
         Type: Audio,
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         Size: 8,
-        Timestamp: 9646
+        Timestamp: 9646,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 744,
         Size: 261,
         Timestamp: 9667,
+        ExtraData: {
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+          CompositionTime: 33,
+          FinalTime: 9700
+        },
         Nalus: [
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             StartPosition: 9,
@@ -6605,19 +9418,30 @@
         Type: Audio,
         Index: 745,
         Size: 8,
-        Timestamp: 9667
+        Timestamp: 9667,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 746,
         Size: 8,
-        Timestamp: 9688
+        Timestamp: 9688,
+        ExtraData: {
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+        }
       },
       {
         Type: Video,
         Index: 747,
         Size: 189,
         Timestamp: 9700,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 34,
+          FinalTime: 9734
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6630,19 +9454,30 @@
         Type: Audio,
         Index: 748,
         Size: 8,
-        Timestamp: 9710
+        Timestamp: 9710,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 749,
         Size: 8,
-        Timestamp: 9731
+        Timestamp: 9731,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 750,
         Size: 451,
         Timestamp: 9734,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 133,
+          FinalTime: 9867
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6655,13 +9490,21 @@
         Type: Audio,
         Index: 751,
         Size: 8,
-        Timestamp: 9752
+        Timestamp: 9752,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 752,
         Size: 306,
         Timestamp: 9767,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 33,
+          FinalTime: 9800
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6674,19 +9517,30 @@
         Type: Audio,
         Index: 753,
         Size: 8,
-        Timestamp: 9774
+        Timestamp: 9774,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 754,
         Size: 8,
-        Timestamp: 9795
+        Timestamp: 9795,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 755,
         Size: 199,
         Timestamp: 9800,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 34,
+          FinalTime: 9834
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6699,13 +9553,21 @@
         Type: Audio,
         Index: 756,
         Size: 8,
-        Timestamp: 9816
+        Timestamp: 9816,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 757,
         Size: 751,
         Timestamp: 9834,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 100,
+          FinalTime: 9934
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6718,19 +9580,30 @@
         Type: Audio,
         Index: 758,
         Size: 8,
-        Timestamp: 9838
+        Timestamp: 9838,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 759,
         Size: 8,
-        Timestamp: 9859
+        Timestamp: 9859,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 760,
         Size: 180,
         Timestamp: 9867,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 33,
+          FinalTime: 9900
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6743,13 +9616,21 @@
         Type: Audio,
         Index: 761,
         Size: 8,
-        Timestamp: 9880
+        Timestamp: 9880,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 762,
         Size: 610,
         Timestamp: 9900,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 100,
+          FinalTime: 10000
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6762,19 +9643,30 @@
         Type: Audio,
         Index: 763,
         Size: 8,
-        Timestamp: 9902
+        Timestamp: 9902,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 764,
         Size: 8,
-        Timestamp: 9923
+        Timestamp: 9923,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 765,
         Size: 164,
         Timestamp: 9934,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 33,
+          FinalTime: 9967
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6787,19 +9679,30 @@
         Type: Audio,
         Index: 766,
         Size: 8,
-        Timestamp: 9944
+        Timestamp: 9944,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 767,
         Size: 8,
-        Timestamp: 9966
+        Timestamp: 9966,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 768,
         Size: 712,
         Timestamp: 9967,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 100,
+          FinalTime: 10067
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6812,13 +9715,21 @@
         Type: Audio,
         Index: 769,
         Size: 8,
-        Timestamp: 9987
+        Timestamp: 9987,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 770,
         Size: 204,
         Timestamp: 10000,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 34,
+          FinalTime: 10034
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6831,19 +9742,30 @@
         Type: Audio,
         Index: 771,
         Size: 8,
-        Timestamp: 10008
+        Timestamp: 10008,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 772,
         Size: 8,
-        Timestamp: 10030
+        Timestamp: 10030,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 773,
         Size: 695,
         Timestamp: 10034,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 100,
+          FinalTime: 10134
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6856,13 +9778,21 @@
         Type: Audio,
         Index: 774,
         Size: 8,
-        Timestamp: 10051
+        Timestamp: 10051,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 775,
         Size: 165,
         Timestamp: 10067,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 33,
+          FinalTime: 10100
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6875,19 +9805,30 @@
         Type: Audio,
         Index: 776,
         Size: 8,
-        Timestamp: 10072
+        Timestamp: 10072,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 777,
         Size: 8,
-        Timestamp: 10094
+        Timestamp: 10094,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 778,
         Size: 794,
         Timestamp: 10100,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 100,
+          FinalTime: 10200
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6900,13 +9841,21 @@
         Type: Audio,
         Index: 779,
         Size: 8,
-        Timestamp: 10115
+        Timestamp: 10115,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 780,
         Size: 191,
         Timestamp: 10134,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 33,
+          FinalTime: 10167
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6919,19 +9868,30 @@
         Type: Audio,
         Index: 781,
         Size: 8,
-        Timestamp: 10136
+        Timestamp: 10136,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 782,
         Size: 8,
-        Timestamp: 10158
+        Timestamp: 10158,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 783,
         Size: 900,
         Timestamp: 10167,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 100,
+          FinalTime: 10267
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6944,13 +9904,21 @@
         Type: Audio,
         Index: 784,
         Size: 8,
-        Timestamp: 10179
+        Timestamp: 10179,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 785,
         Size: 162,
         Timestamp: 10200,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 34,
+          FinalTime: 10234
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6963,19 +9931,30 @@
         Type: Audio,
         Index: 786,
         Size: 8,
-        Timestamp: 10200
+        Timestamp: 10200,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 787,
         Size: 8,
-        Timestamp: 10222
+        Timestamp: 10222,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 788,
         Size: 847,
         Timestamp: 10234,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 100,
+          FinalTime: 10334
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -6988,19 +9967,30 @@
         Type: Audio,
         Index: 789,
         Size: 8,
-        Timestamp: 10243
+        Timestamp: 10243,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 790,
         Size: 8,
-        Timestamp: 10264
+        Timestamp: 10264,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 791,
         Size: 184,
         Timestamp: 10267,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 33,
+          FinalTime: 10300
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -7013,13 +10003,21 @@
         Type: Audio,
         Index: 792,
         Size: 8,
-        Timestamp: 10286
+        Timestamp: 10286,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 793,
         Size: 476,
         Timestamp: 10300,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 134,
+          FinalTime: 10434
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -7032,19 +10030,30 @@
         Type: Audio,
         Index: 794,
         Size: 8,
-        Timestamp: 10307
+        Timestamp: 10307,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Audio,
         Index: 795,
         Size: 8,
-        Timestamp: 10328
+        Timestamp: 10328,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       },
       {
         Type: Video,
         Index: 796,
         Size: 270,
         Timestamp: 10334,
+        ExtraData: {
+          FirstBytes: 2701,
+          CompositionTime: 33,
+          FinalTime: 10367
+        },
         Nalus: [
           {
             StartPosition: 9,
@@ -7057,7 +10066,10 @@
         Type: Audio,
         Index: 797,
         Size: 8,
-        Timestamp: 10350
+        Timestamp: 10350,
+        ExtraData: {
+          FirstBytes: AF01
+        }
       }
     ],
     Name: PipelineDataAction
@@ -7068,7 +10080,11 @@
       Flag: Keyframe, End,
       Index: 798,
       Size: 5,
-      Timestamp: 10334
+      Timestamp: 10334,
+      ExtraData: {
+        FirstBytes: 1702,
+        FinalTime: 10334
+      }
     },
     Name: PipelineEndAction
   }
diff --git a/test/BililiveRecorder.Flv.Tests/Expectations/FlvParser/XmlOutput.Output_path=sample.flv.verified.xml b/test/BililiveRecorder.Flv.Tests/Expectations/FlvParser/XmlOutput.Output_path=sample.flv.verified.xml
index 161dae1..4c5e69c 100644
--- a/test/BililiveRecorder.Flv.Tests/Expectations/FlvParser/XmlOutput.Output_path=sample.flv.verified.xml
+++ b/test/BililiveRecorder.Flv.Tests/Expectations/FlvParser/XmlOutput.Output_path=sample.flv.verified.xml
@@ -3,14 +3,18 @@
   <Tags>
     <Tag Type="Script" Size="293" Timestamp="0">
       <ScriptData>[{"Type":"String","Value":"onMetaData"},{"Type":"EcmaArray","Value":{"duration":{"Type":"Number","Value":10.467},"width":{"Type":"Number","Value":426.0},"height":{"Type":"Number","Value":240.0},"videodatarate":{"Type":"Number","Value":97.65625},"framerate":{"Type":"Number","Value":30.0},"videocodecid":{"Type":"Number","Value":7.0},"audiodatarate":{"Type":"Number","Value":156.25},"audiosamplerate":{"Type":"Number","Value":48000.0},"audiosamplesize":{"Type":"Number","Value":16.0},"stereo":{"Type":"Boolean","Value":true},"audiocodecid":{"Type":"Number","Value":10.0},"encoder":{"Type":"String","Value":"Lavf58.29.100"},"filesize":{"Type":"Number","Value":152006.0}}}]</ScriptData>
+      <ExtraData FirstBytes="0200" />
     </Tag>
     <Tag Type="Video" Flag="Header Keyframe" Size="49" Timestamp="0">
+      <ExtraData FirstBytes="1700" CompositionTime="0" FinalTime="0" />
       <BinaryData>170000000001640015FFE1001C67640015ACD941B1FE4F016A02020280000003008000001E478B16CB01000568EF82BCB0</BinaryData>
     </Tag>
     <Tag Type="Audio" Flag="Header" Size="7" Timestamp="0">
+      <ExtraData FirstBytes="AF00" />
       <BinaryData>AF00119056E500</BinaryData>
     </Tag>
     <Tag Type="Video" Flag="Keyframe" Size="4795" Timestamp="0">
+      <ExtraData FirstBytes="1701" CompositionTime="67" FinalTime="67" />
       <Nalus StartPosition="9" FullSize="751" Type="Sei" />
       <Nalus StartPosition="764" FullSize="28" Type="Sps" />
       <Nalus StartPosition="796" FullSize="5" Type="Pps" />
@@ -18,1420 +22,2698 @@
       <Nalus StartPosition="1560" FullSize="3235" Type="CodedSliceOfAnIdrPicture" />
     </Tag>
     <Tag Type="Video" Size="579" Timestamp="34">
+      <ExtraData FirstBytes="2701" CompositionTime="66" FinalTime="100" />
       <Nalus StartPosition="9" FullSize="570" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
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+      <ExtraData FirstBytes="2701" CompositionTime="34" FinalTime="9334" />
       <Nalus StartPosition="9" FullSize="220" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9304" />
-    <Tag Type="Audio" Size="8" Timestamp="9326" />
+    <Tag Type="Audio" Size="8" Timestamp="9304">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="9326">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="573" Timestamp="9334">
+      <ExtraData FirstBytes="2701" CompositionTime="133" FinalTime="9467" />
       <Nalus StartPosition="9" FullSize="564" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9347" />
+    <Tag Type="Audio" Size="8" Timestamp="9347">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="259" Timestamp="9367">
+      <ExtraData FirstBytes="2701" CompositionTime="33" FinalTime="9400" />
       <Nalus StartPosition="9" FullSize="250" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9368" />
-    <Tag Type="Audio" Size="8" Timestamp="9390" />
+    <Tag Type="Audio" Size="8" Timestamp="9368">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="9390">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="166" Timestamp="9400">
+      <ExtraData FirstBytes="2701" CompositionTime="34" FinalTime="9434" />
       <Nalus StartPosition="9" FullSize="157" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9411" />
-    <Tag Type="Audio" Size="8" Timestamp="9432" />
+    <Tag Type="Audio" Size="8" Timestamp="9411">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="9432">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="873" Timestamp="9434">
+      <ExtraData FirstBytes="2701" CompositionTime="100" FinalTime="9534" />
       <Nalus StartPosition="9" FullSize="864" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9454" />
+    <Tag Type="Audio" Size="8" Timestamp="9454">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="174" Timestamp="9467">
+      <ExtraData FirstBytes="2701" CompositionTime="33" FinalTime="9500" />
       <Nalus StartPosition="9" FullSize="165" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9475" />
-    <Tag Type="Audio" Size="8" Timestamp="9496" />
+    <Tag Type="Audio" Size="8" Timestamp="9475">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="9496">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="837" Timestamp="9500">
+      <ExtraData FirstBytes="2701" CompositionTime="100" FinalTime="9600" />
       <Nalus StartPosition="9" FullSize="828" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9518" />
+    <Tag Type="Audio" Size="8" Timestamp="9518">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="187" Timestamp="9534">
+      <ExtraData FirstBytes="2701" CompositionTime="33" FinalTime="9567" />
       <Nalus StartPosition="9" FullSize="178" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9539" />
-    <Tag Type="Audio" Size="8" Timestamp="9560" />
+    <Tag Type="Audio" Size="8" Timestamp="9539">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="9560">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="825" Timestamp="9567">
+      <ExtraData FirstBytes="2701" CompositionTime="100" FinalTime="9667" />
       <Nalus StartPosition="9" FullSize="816" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9582" />
+    <Tag Type="Audio" Size="8" Timestamp="9582">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="199" Timestamp="9600">
+      <ExtraData FirstBytes="2701" CompositionTime="34" FinalTime="9634" />
       <Nalus StartPosition="9" FullSize="190" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9603" />
-    <Tag Type="Audio" Size="8" Timestamp="9624" />
+    <Tag Type="Audio" Size="8" Timestamp="9603">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="9624">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="502" Timestamp="9634">
+      <ExtraData FirstBytes="2701" CompositionTime="133" FinalTime="9767" />
       <Nalus StartPosition="9" FullSize="493" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9646" />
+    <Tag Type="Audio" Size="8" Timestamp="9646">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="261" Timestamp="9667">
+      <ExtraData FirstBytes="2701" CompositionTime="33" FinalTime="9700" />
       <Nalus StartPosition="9" FullSize="252" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9667" />
-    <Tag Type="Audio" Size="8" Timestamp="9688" />
+    <Tag Type="Audio" Size="8" Timestamp="9667">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="9688">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="189" Timestamp="9700">
+      <ExtraData FirstBytes="2701" CompositionTime="34" FinalTime="9734" />
       <Nalus StartPosition="9" FullSize="180" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9710" />
-    <Tag Type="Audio" Size="8" Timestamp="9731" />
+    <Tag Type="Audio" Size="8" Timestamp="9710">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="9731">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="451" Timestamp="9734">
+      <ExtraData FirstBytes="2701" CompositionTime="133" FinalTime="9867" />
       <Nalus StartPosition="9" FullSize="442" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9752" />
+    <Tag Type="Audio" Size="8" Timestamp="9752">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="306" Timestamp="9767">
+      <ExtraData FirstBytes="2701" CompositionTime="33" FinalTime="9800" />
       <Nalus StartPosition="9" FullSize="297" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9774" />
-    <Tag Type="Audio" Size="8" Timestamp="9795" />
+    <Tag Type="Audio" Size="8" Timestamp="9774">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="9795">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="199" Timestamp="9800">
+      <ExtraData FirstBytes="2701" CompositionTime="34" FinalTime="9834" />
       <Nalus StartPosition="9" FullSize="190" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9816" />
+    <Tag Type="Audio" Size="8" Timestamp="9816">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="751" Timestamp="9834">
+      <ExtraData FirstBytes="2701" CompositionTime="100" FinalTime="9934" />
       <Nalus StartPosition="9" FullSize="742" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9838" />
-    <Tag Type="Audio" Size="8" Timestamp="9859" />
+    <Tag Type="Audio" Size="8" Timestamp="9838">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="9859">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="180" Timestamp="9867">
+      <ExtraData FirstBytes="2701" CompositionTime="33" FinalTime="9900" />
       <Nalus StartPosition="9" FullSize="171" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9880" />
+    <Tag Type="Audio" Size="8" Timestamp="9880">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="610" Timestamp="9900">
+      <ExtraData FirstBytes="2701" CompositionTime="100" FinalTime="10000" />
       <Nalus StartPosition="9" FullSize="601" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9902" />
-    <Tag Type="Audio" Size="8" Timestamp="9923" />
+    <Tag Type="Audio" Size="8" Timestamp="9902">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="9923">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="164" Timestamp="9934">
+      <ExtraData FirstBytes="2701" CompositionTime="33" FinalTime="9967" />
       <Nalus StartPosition="9" FullSize="155" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9944" />
-    <Tag Type="Audio" Size="8" Timestamp="9966" />
+    <Tag Type="Audio" Size="8" Timestamp="9944">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="9966">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="712" Timestamp="9967">
+      <ExtraData FirstBytes="2701" CompositionTime="100" FinalTime="10067" />
       <Nalus StartPosition="9" FullSize="703" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="9987" />
+    <Tag Type="Audio" Size="8" Timestamp="9987">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="204" Timestamp="10000">
+      <ExtraData FirstBytes="2701" CompositionTime="34" FinalTime="10034" />
       <Nalus StartPosition="9" FullSize="195" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="10008" />
-    <Tag Type="Audio" Size="8" Timestamp="10030" />
+    <Tag Type="Audio" Size="8" Timestamp="10008">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="10030">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="695" Timestamp="10034">
+      <ExtraData FirstBytes="2701" CompositionTime="100" FinalTime="10134" />
       <Nalus StartPosition="9" FullSize="686" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="10051" />
+    <Tag Type="Audio" Size="8" Timestamp="10051">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="165" Timestamp="10067">
+      <ExtraData FirstBytes="2701" CompositionTime="33" FinalTime="10100" />
       <Nalus StartPosition="9" FullSize="156" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="10072" />
-    <Tag Type="Audio" Size="8" Timestamp="10094" />
+    <Tag Type="Audio" Size="8" Timestamp="10072">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="10094">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="794" Timestamp="10100">
+      <ExtraData FirstBytes="2701" CompositionTime="100" FinalTime="10200" />
       <Nalus StartPosition="9" FullSize="785" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="10115" />
+    <Tag Type="Audio" Size="8" Timestamp="10115">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="191" Timestamp="10134">
+      <ExtraData FirstBytes="2701" CompositionTime="33" FinalTime="10167" />
       <Nalus StartPosition="9" FullSize="182" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="10136" />
-    <Tag Type="Audio" Size="8" Timestamp="10158" />
+    <Tag Type="Audio" Size="8" Timestamp="10136">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="10158">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="900" Timestamp="10167">
+      <ExtraData FirstBytes="2701" CompositionTime="100" FinalTime="10267" />
       <Nalus StartPosition="9" FullSize="891" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="10179" />
+    <Tag Type="Audio" Size="8" Timestamp="10179">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="162" Timestamp="10200">
+      <ExtraData FirstBytes="2701" CompositionTime="34" FinalTime="10234" />
       <Nalus StartPosition="9" FullSize="153" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="10200" />
-    <Tag Type="Audio" Size="8" Timestamp="10222" />
+    <Tag Type="Audio" Size="8" Timestamp="10200">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="10222">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="847" Timestamp="10234">
+      <ExtraData FirstBytes="2701" CompositionTime="100" FinalTime="10334" />
       <Nalus StartPosition="9" FullSize="838" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="10243" />
-    <Tag Type="Audio" Size="8" Timestamp="10264" />
+    <Tag Type="Audio" Size="8" Timestamp="10243">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="10264">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="184" Timestamp="10267">
+      <ExtraData FirstBytes="2701" CompositionTime="33" FinalTime="10300" />
       <Nalus StartPosition="9" FullSize="175" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="10286" />
+    <Tag Type="Audio" Size="8" Timestamp="10286">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="476" Timestamp="10300">
+      <ExtraData FirstBytes="2701" CompositionTime="134" FinalTime="10434" />
       <Nalus StartPosition="9" FullSize="467" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="10307" />
-    <Tag Type="Audio" Size="8" Timestamp="10328" />
+    <Tag Type="Audio" Size="8" Timestamp="10307">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Audio" Size="8" Timestamp="10328">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
     <Tag Type="Video" Size="270" Timestamp="10334">
+      <ExtraData FirstBytes="2701" CompositionTime="33" FinalTime="10367" />
       <Nalus StartPosition="9" FullSize="261" Type="CodedSliceOfANonIdrPicture" />
     </Tag>
-    <Tag Type="Audio" Size="8" Timestamp="10350" />
-    <Tag Type="Video" Flag="Keyframe End" Size="5" Timestamp="10334" />
+    <Tag Type="Audio" Size="8" Timestamp="10350">
+      <ExtraData FirstBytes="AF01" />
+    </Tag>
+    <Tag Type="Video" Flag="Keyframe End" Size="5" Timestamp="10334">
+      <ExtraData FirstBytes="1702" CompositionTime="0" FinalTime="10334" />
+    </Tag>
   </Tags>
 </BililiveRecorderFlv>
\ No newline at end of file
diff --git a/test/BililiveRecorder.Flv.Tests/FlvTests/Int24Tests.cs b/test/BililiveRecorder.Flv.Tests/FlvTests/Int24Tests.cs
new file mode 100644
index 0000000..29825dc
--- /dev/null
+++ b/test/BililiveRecorder.Flv.Tests/FlvTests/Int24Tests.cs
@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using Xunit;
+
+namespace BililiveRecorder.Flv.Tests.FlvTests
+{
+    public class Int24Tests
+    {
+        private static IEnumerable<object[]> TestData()
+        {
+            yield return new object[] { 0, new byte[] { 0, 0, 0 } };
+            yield return new object[] { 1, new byte[] { 0, 0, 1 } };
+            yield return new object[] { -1, new byte[] { 0xFF, 0xFF, 0xFF } };
+            yield return new object[] { -8388608, new byte[] { 0x80, 0, 0 } };
+            yield return new object[] { 8388607, new byte[] { 0x7F, 0xFF, 0xFF } };
+            yield return new object[] { -5517841, new byte[] { 0xAB, 0xCD, 0xEF } };
+        }
+
+        [Theory, MemberData(nameof(TestData))]
+        public void Int24SerializeCorrectly(int number, byte[] bytes)
+        {
+            var result = new byte[3];
+            Int24.WriteInt24(result, number);
+            Assert.Equal(bytes, result);
+        }
+
+        [Theory, MemberData(nameof(TestData))]
+        public void Int24DeserializeCorrectly(int number, byte[] bytes)
+        {
+            var result = Int24.ReadInt24(bytes);
+            Assert.Equal(number, result);
+        }
+
+        [Theory]
+        [InlineData(8388608)]
+        [InlineData(-8388609)]
+        public void Int24ThrowOnOutOfRange(int number)
+        {
+            Assert.Throws<ArgumentOutOfRangeException>(() =>
+            {
+                var result = new byte[3];
+                Int24.WriteInt24(result, number);
+            });
+        }
+    }
+}
diff --git a/test/BililiveRecorder.Flv.Tests/FlvTests/ParserTest.cs b/test/BililiveRecorder.Flv.Tests/FlvTests/ParserTests.cs
similarity index 97%
rename from test/BililiveRecorder.Flv.Tests/FlvTests/ParserTest.cs
rename to test/BililiveRecorder.Flv.Tests/FlvTests/ParserTests.cs
index 6ce02cc..93b4d0c 100644
--- a/test/BililiveRecorder.Flv.Tests/FlvTests/ParserTest.cs
+++ b/test/BililiveRecorder.Flv.Tests/FlvTests/ParserTests.cs
@@ -11,7 +11,7 @@ namespace BililiveRecorder.Flv.Tests.FlvTests
 {
     [UsesVerify]
     [ExpectationPath("FlvParser")]
-    public class ParserTest
+    public class ParserTests
     {
         [Theory]
         [Expectation("XmlOutput")]