diff --git a/FFMpegCore/FFMpeg/Arguments/ConcatArgument.cs b/FFMpegCore/FFMpeg/Arguments/ConcatArgument.cs
index b0908b4..d43988f 100644
--- a/FFMpegCore/FFMpeg/Arguments/ConcatArgument.cs
+++ b/FFMpegCore/FFMpeg/Arguments/ConcatArgument.cs
@@ -1,4 +1,6 @@
 using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace FFMpegCore.Arguments
 {
@@ -15,6 +17,10 @@ public ConcatArgument(IEnumerable<string> values)
             Values = values;
         }
 
+        public void Pre() { }
+        public Task During(CancellationToken? cancellationToken = null) => Task.CompletedTask;
+        public void Post() { }
+        
         public string Text => $"-i \"concat:{string.Join(@"|", Values)}\"";
     }
 }
diff --git a/FFMpegCore/FFMpeg/Arguments/DemuxConcatArgument.cs b/FFMpegCore/FFMpeg/Arguments/DemuxConcatArgument.cs
index 2570db8..1378359 100644
--- a/FFMpegCore/FFMpeg/Arguments/DemuxConcatArgument.cs
+++ b/FFMpegCore/FFMpeg/Arguments/DemuxConcatArgument.cs
@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace FFMpegCore.Arguments
 {
@@ -17,15 +19,9 @@ public DemuxConcatArgument(IEnumerable<string> values)
         }
         private readonly string _tempFileName = Path.Combine(FFMpegOptions.Options.TempDirectory, Guid.NewGuid() + ".txt");
 
-        public void Pre()
-        {
-            File.WriteAllLines(_tempFileName, Values);
-        }
-
-        public void Post()
-        {
-            File.Delete(_tempFileName);
-        }
+        public void Pre() => File.WriteAllLines(_tempFileName, Values);
+        public Task During(CancellationToken? cancellationToken = null) => Task.CompletedTask;
+        public void Post() => File.Delete(_tempFileName);
 
         public string Text => $"-f concat -safe 0 -i \"{_tempFileName}\"";
     }
diff --git a/FFMpegCore/FFMpeg/Arguments/IInputOutputArgument.cs b/FFMpegCore/FFMpeg/Arguments/IInputOutputArgument.cs
index 939cc3f..6998d5c 100644
--- a/FFMpegCore/FFMpeg/Arguments/IInputOutputArgument.cs
+++ b/FFMpegCore/FFMpeg/Arguments/IInputOutputArgument.cs
@@ -5,8 +5,8 @@ namespace FFMpegCore.Arguments
 {
     public interface IInputOutputArgument : IArgument
     {
-        void Pre() {}
-        Task During(CancellationToken? cancellationToken = null) => Task.CompletedTask;
-        void Post() {}
+        void Pre();
+        Task During(CancellationToken? cancellationToken = null);
+        void Post();
     }
 }
\ No newline at end of file
diff --git a/FFMpegCore/FFMpeg/Arguments/InputArgument.cs b/FFMpegCore/FFMpeg/Arguments/InputArgument.cs
index 57d8ffe..0ff4bd8 100644
--- a/FFMpegCore/FFMpeg/Arguments/InputArgument.cs
+++ b/FFMpegCore/FFMpeg/Arguments/InputArgument.cs
@@ -1,6 +1,8 @@
 using System;
 using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace FFMpegCore.Arguments
 {
@@ -34,6 +36,9 @@ public void Pre()
             }
         }
 
+        public Task During(CancellationToken? cancellationToken = null) => Task.CompletedTask;
+        public void Post() { }
+        
         public string Text => string.Join(" ", FilePaths.Select(v => $"-i \"{v}\""));
     }
 }
diff --git a/FFMpegCore/FFMpeg/Arguments/OutputArgument.cs b/FFMpegCore/FFMpeg/Arguments/OutputArgument.cs
index 5a53886..1321402 100644
--- a/FFMpegCore/FFMpeg/Arguments/OutputArgument.cs
+++ b/FFMpegCore/FFMpeg/Arguments/OutputArgument.cs
@@ -1,5 +1,7 @@
 using System;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using FFMpegCore.Exceptions;
 
 namespace FFMpegCore.Arguments
@@ -23,6 +25,7 @@ public void Pre()
             if (!Overwrite && File.Exists(Path))
                 throw new FFMpegException(FFMpegExceptionType.File, "Output file already exists and overwrite is disabled");
         }
+        public Task During(CancellationToken? cancellationToken = null) => Task.CompletedTask;
         public void Post()
         {
             if (!File.Exists(Path))
diff --git a/FFMpegCore/FFMpeg/FFMpegArguments.cs b/FFMpegCore/FFMpeg/FFMpegArguments.cs
index d3b900c..09e1019 100644
--- a/FFMpegCore/FFMpeg/FFMpegArguments.cs
+++ b/FFMpegCore/FFMpeg/FFMpegArguments.cs
@@ -32,7 +32,7 @@ private FFMpegArguments(IInputArgument inputArgument)
         public static FFMpegArguments FromInputFiles(params FileInfo[] files) => new FFMpegArguments(new InputArgument(false, files));
         public static FFMpegArguments FromInputFiles(bool verifyExists, params FileInfo[] files) => new FFMpegArguments(new InputArgument(verifyExists, files));
         public static FFMpegArguments FromConcatenation(params string[] files) => new FFMpegArguments(new ConcatArgument(files));
-        public static FFMpegArguments FromDemuxConcatenation(params string[] files) => new FFMpegArguments(new ConcatArgument(files));
+        public static FFMpegArguments FromDemuxConcatenation(params string[] files) => new FFMpegArguments(new DemuxConcatArgument(files));
         public static FFMpegArguments FromPipe(IPipeSource writer) => new FFMpegArguments(new InputPipeArgument(writer));
 
         
@@ -117,7 +117,7 @@ internal void Post()
             _outputArgument.Post();
         }
 
-        public TArgument? Find<TArgument>() where TArgument : class, IArgument
+        public TArgument Find<TArgument>() where TArgument : class, IArgument
         {
             return _arguments.FirstOrDefault(arg => arg is TArgument) as TArgument;
         }
diff --git a/FFMpegCore/FFMpeg/FFMpegOptions.cs b/FFMpegCore/FFMpeg/FFMpegOptions.cs
index 426b844..8a98a0a 100644
--- a/FFMpegCore/FFMpeg/FFMpegOptions.cs
+++ b/FFMpegCore/FFMpeg/FFMpegOptions.cs
@@ -33,8 +33,8 @@ static FFMpegOptions()
             if (File.Exists(ConfigFile))
             {
                 Options = JsonSerializer.Deserialize<FFMpegOptions>(File.ReadAllText(ConfigFile));
-                foreach (var (key, value) in DefaultExtensionsOverrides)
-                    if (!Options.ExtensionOverrides.ContainsKey(key)) Options.ExtensionOverrides.Add(key, value);
+                foreach (var pair in DefaultExtensionsOverrides)
+                    if (!Options.ExtensionOverrides.ContainsKey(pair.Key)) Options.ExtensionOverrides.Add(pair.Key, pair.Value);
             }
         }
 
diff --git a/FFMpegCore/FFMpegCore.csproj b/FFMpegCore/FFMpegCore.csproj
index b7a84c6..8b17892 100644
--- a/FFMpegCore/FFMpegCore.csproj
+++ b/FFMpegCore/FFMpegCore.csproj
@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.1</TargetFramework>
     <NeutralLanguage>en</NeutralLanguage>
     <RepositoryUrl>https://github.com/rosenbjerg/FFMpegCore</RepositoryUrl>
     <PackageProjectUrl>https://github.com/rosenbjerg/FFMpegCore</PackageProjectUrl>
@@ -10,14 +9,17 @@
     <Version>1.0.12</Version>
     <AssemblyVersion>1.1.0.0</AssemblyVersion>
     <FileVersion>1.1.0.0</FileVersion>
-    <PackageReleaseNotes>Fix null reference exception in ParseAudioStream (#67)</PackageReleaseNotes>
+    <PackageReleaseNotes>- Support for .NET Standard 2.0
+- Minor fixes
+- DemuxConcatArgument</PackageReleaseNotes>
     <LangVersion>8</LangVersion>
-    <PackageVersion>2.0.1</PackageVersion>
+    <PackageVersion>2.1.0</PackageVersion>
     <Authors>Vlad Jerca, Malte Rosenbjerg</Authors>
     <PackageTags>ffmpeg ffprobe convert video audio mediafile resize analyze muxing</PackageTags>
     <RepositoryType>GitHub</RepositoryType>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <Nullable>enable</Nullable>
+    <TargetFramework>netstandard2.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
@@ -32,8 +34,4 @@
     <PackageReference Include="System.Text.Json" Version="4.7.1" />
   </ItemGroup>
 
-  <ItemGroup>
-    <Folder Include="FFMpeg\Models\" />
-  </ItemGroup>
-
 </Project>