diff --git a/BililiveRecorder.ToolBox/ProcessingRules/FfmpegDetectionRule.cs b/BililiveRecorder.ToolBox/ProcessingRules/FfmpegDetectionRule.cs
new file mode 100644
index 0000000..1507a3e
--- /dev/null
+++ b/BililiveRecorder.ToolBox/ProcessingRules/FfmpegDetectionRule.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Linq;
+using BililiveRecorder.Flv.Amf;
+using BililiveRecorder.Flv.Pipeline;
+using BililiveRecorder.Flv.Pipeline.Actions;
+
+namespace BililiveRecorder.ToolBox.ProcessingRules
+{
+    public class FfmpegDetectionRule : ISimpleProcessingRule
+    {
+        public bool EndTagDetected { get; private set; }
+        public bool LavfEncoderDetected { get; private set; }
+
+        public void Run(FlvProcessingContext context, Action next)
+        {
+            if (!this.EndTagDetected && context.Actions.Any(x => x is PipelineEndAction))
+            {
+                this.EndTagDetected = true;
+            }
+
+            if (!this.LavfEncoderDetected)
+            {
+                if (context.Actions.Any(action =>
+                {
+                    if (action is PipelineScriptAction scriptAction)
+                    {
+                        var encoder = scriptAction?.Tag?.ScriptData?.GetMetadataValue()?.Value?["encoder"] as ScriptDataString;
+                        if (encoder is not null)
+                        {
+                            return encoder.Value.StartsWith("Lavf", StringComparison.Ordinal);
+                        }
+                    }
+                    return false;
+                }))
+                {
+                    this.LavfEncoderDetected = true;
+                }
+            }
+        }
+    }
+}
diff --git a/BililiveRecorder.ToolBox/Tool/Analyze/AnalyzeHandler.cs b/BililiveRecorder.ToolBox/Tool/Analyze/AnalyzeHandler.cs
index f5de3c7..2d2b51b 100644
--- a/BililiveRecorder.ToolBox/Tool/Analyze/AnalyzeHandler.cs
+++ b/BililiveRecorder.ToolBox/Tool/Analyze/AnalyzeHandler.cs
@@ -93,7 +93,8 @@ namespace BililiveRecorder.ToolBox.Tool.Analyze
                 using var grouping = new TagGroupReader(tagReader);
                 using var writer = new FlvProcessingContextWriter(tagWriter: tagWriter, allowMissingHeader: true, disableKeyframes: true, logger: logger);
                 var statsRule = new StatsRule();
-                var pipeline = new ProcessingPipelineBuilder(new ServiceCollection().BuildServiceProvider()).Add(statsRule).AddDefault().AddRemoveFillerData().Build();
+                var ffmpegDetectionRule = new FfmpegDetectionRule();
+                var pipeline = new ProcessingPipelineBuilder(new ServiceCollection().BuildServiceProvider()).Add(statsRule).Add(ffmpegDetectionRule).AddDefault().AddRemoveFillerData().Build();
 
                 // Run
                 await Task.Run(async () =>
@@ -144,6 +145,7 @@ namespace BililiveRecorder.ToolBox.Tool.Analyze
 
                         NeedFix = tagWriter.OutputFileCount != 1 || countableComments.Any(),
                         Unrepairable = countableComments.Any(x => x.Type == CommentType.Unrepairable),
+                        FfmpegDetected = ffmpegDetectionRule.LavfEncoderDetected && ffmpegDetectionRule.EndTagDetected,
 
                         OutputFileCount = tagWriter.OutputFileCount,
 
diff --git a/BililiveRecorder.ToolBox/Tool/Analyze/AnalyzeResponse.cs b/BililiveRecorder.ToolBox/Tool/Analyze/AnalyzeResponse.cs
index a6b7fcb..4bf94c5 100644
--- a/BililiveRecorder.ToolBox/Tool/Analyze/AnalyzeResponse.cs
+++ b/BililiveRecorder.ToolBox/Tool/Analyze/AnalyzeResponse.cs
@@ -9,6 +9,7 @@ namespace BililiveRecorder.ToolBox.Tool.Analyze
 
         public bool NeedFix { get; set; }
         public bool Unrepairable { get; set; }
+        public bool FfmpegDetected { get; set; }
 
         public int OutputFileCount { get; set; }
 
@@ -41,6 +42,18 @@ namespace BililiveRecorder.ToolBox.Tool.Analyze
                 });
             }
 
+            if (this.FfmpegDetected)
+            {
+                AnsiConsole.Write(new Panel("This file seems like it was written by FFmpeg.\n" +
+                    "It might no longer possible to fix this file, if there's any problem.\n" +
+                    "Only unprocessed data taken directly from the stream server could be fixed.")
+                {
+                    Header = new PanelHeader("[bold yellow]FFmpeg Detected[/]"),
+                    Border = BoxBorder.Rounded,
+                    BorderStyle = new Style(foreground: Color.Yellow)
+                });
+            }
+
             AnsiConsole.Write(new Panel(this.InputPath.EscapeMarkup())
             {
                 Header = new PanelHeader("Input"),
diff --git a/BililiveRecorder.ToolBox/Tool/Fix/FixHandler.cs b/BililiveRecorder.ToolBox/Tool/Fix/FixHandler.cs
index 5ed44fe..a1989d1 100644
--- a/BililiveRecorder.ToolBox/Tool/Fix/FixHandler.cs
+++ b/BililiveRecorder.ToolBox/Tool/Fix/FixHandler.cs
@@ -112,7 +112,8 @@ namespace BililiveRecorder.ToolBox.Tool.Fix
                 using var grouping = new TagGroupReader(tagReader);
                 using var writer = new FlvProcessingContextWriter(tagWriter: tagWriter, allowMissingHeader: true, disableKeyframes: false, logger: logger);
                 var statsRule = new StatsRule();
-                var pipeline = new ProcessingPipelineBuilder(new ServiceCollection().BuildServiceProvider()).Add(statsRule).AddDefault().AddRemoveFillerData().Build();
+                var ffmpegDetectionRule = new FfmpegDetectionRule();
+                var pipeline = new ProcessingPipelineBuilder(new ServiceCollection().BuildServiceProvider()).Add(statsRule).Add(ffmpegDetectionRule).AddDefault().AddRemoveFillerData().Build();
 
                 // Run
                 await Task.Run(async () =>
@@ -200,6 +201,7 @@ namespace BililiveRecorder.ToolBox.Tool.Fix
 
                         NeedFix = outputPaths.Count != 1 || countableComments.Any(),
                         Unrepairable = countableComments.Any(x => x.Type == CommentType.Unrepairable),
+                        FfmpegDetected = ffmpegDetectionRule.LavfEncoderDetected && ffmpegDetectionRule.EndTagDetected,
 
                         VideoStats = videoStats,
                         AudioStats = audioStats,
diff --git a/BililiveRecorder.ToolBox/Tool/Fix/FixResponse.cs b/BililiveRecorder.ToolBox/Tool/Fix/FixResponse.cs
index 69e339a..9271a3d 100644
--- a/BililiveRecorder.ToolBox/Tool/Fix/FixResponse.cs
+++ b/BililiveRecorder.ToolBox/Tool/Fix/FixResponse.cs
@@ -12,6 +12,7 @@ namespace BililiveRecorder.ToolBox.Tool.Fix
 
         public bool NeedFix { get; set; }
         public bool Unrepairable { get; set; }
+        public bool FfmpegDetected { get; set; }
 
         public int OutputFileCount { get; set; }
 
@@ -41,6 +42,18 @@ namespace BililiveRecorder.ToolBox.Tool.Fix
                 });
             }
 
+            if (this.FfmpegDetected)
+            {
+                AnsiConsole.Write(new Panel("This file seems like it was written by FFmpeg.\n" +
+                    "It might no longer possible to fix this file, if there's any problem.\n" +
+                    "Only unprocessed data taken directly from the stream server could be fixed.")
+                {
+                    Header = new PanelHeader("[bold yellow]FFmpeg Detected[/]"),
+                    Border = BoxBorder.Rounded,
+                    BorderStyle = new Style(foreground: Color.Yellow)
+                });
+            }
+
             AnsiConsole.Write(new Panel(this.InputPath.EscapeMarkup())
             {
                 Header = new PanelHeader("Input"),
diff --git a/BililiveRecorder.WPF/Pages/ToolboxAutoFixPage.xaml b/BililiveRecorder.WPF/Pages/ToolboxAutoFixPage.xaml
index e8c95a9..d28a90f 100644
--- a/BililiveRecorder.WPF/Pages/ToolboxAutoFixPage.xaml
+++ b/BililiveRecorder.WPF/Pages/ToolboxAutoFixPage.xaml
@@ -121,6 +121,9 @@
                             <TextBlock Grid.Row="2" HorizontalAlignment="Center" FontSize="15" Foreground="Red"
                                        Visibility="{Binding Unrepairable,Converter={StaticResource BooleanToVisibilityCollapsedConverter}}"
                                        Text="{l:Loc Toolbox_AutoFix_AnalyzeResult_ContainsUnrepairable}"/>
+                            <TextBlock Grid.Row="2" HorizontalAlignment="Center" FontSize="15" Foreground="Yellow" TextAlignment="Center"
+                                       Visibility="{Binding FfmpegDetected,Converter={StaticResource BooleanToVisibilityCollapsedConverter}}"
+                                       Text="检测到此文件可能是 FFmpeg 输出的&#x0a;文件中的问题可能已经无法修复（如果有问题的话）&#x0a;只有从直播服务器直出的未处理过的数据可以被修复"/>
                             <StackPanel Grid.Row="3" HorizontalAlignment="Center" Margin="10">
                                 <TextBlock Margin="0,0,0,5">
                                     <TextBlock.Text>