Refactor

src/Captura.FFmpeg/Audio/FFmpegAudioWriter.cs

@@ -1,7 +1,7 @@
 using Captura.Audio;
-using System;
 using System.Diagnostics;
 using System.IO;
+using Captura.FFmpeg;
 
 namespace Captura.Models
 {
@@ -47,7 +47,7 @@ public void Write(byte[] Data, int Offset, int Count)
         {
             if (_ffmpegProcess.HasExited)
             {
-                throw new Exception("An Error Occurred with FFmpeg");
+                throw new FFmpegException(_ffmpegProcess.ExitCode);
             }
 
             _ffmpegIn.Write(Data, Offset, Count);

src/Captura.FFmpeg/FFmpegTrimmer.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Threading.Tasks;
+using Captura.Models;
+
+namespace Captura.FFmpeg
+{
+    public class FFmpegTrimmer
+    {
+        public async Task Run(string SourceFile,
+            TimeSpan From,
+            TimeSpan To,
+            string DestFile,
+            bool HasAudio)
+        {
+            var argsBuilder = new FFmpegArgsBuilder();
+
+            var inputArgs = argsBuilder.AddInputFile(SourceFile)
+                .AddArg($"-ss {From}")
+                .AddArg($"-to {To}");
+
+            if (HasAudio)
+                inputArgs.SetAudioCodec("copy");
+
+            argsBuilder.AddOutputFile(DestFile);
+
+            var args = argsBuilder.GetArgs();
+
+            var process = FFmpegService.StartFFmpeg(args, DestFile);
+
+            await Task.Factory.StartNew(process.WaitForExit);
+
+            if (process.ExitCode != 0)
+            {
+                throw new FFmpegException(process.ExitCode);
+            }
+        }
+    }
+}

src/Captura.FFmpeg/Video/FFmpegVideoWriter.cs

@@ -116,7 +116,7 @@ public void WriteAudio(byte[] Buffer, int Length)
         {
             if (_ffmpegProcess.HasExited)
             {
-                throw new Exception("An Error Occurred with FFmpeg");
+                throw new FFmpegException( _ffmpegProcess.ExitCode);
             }
 
             if (_firstAudio)

src/Captura/ViewModels/AboutViewModel.cs

@@ -2,6 +2,7 @@
 using System;
 using System.Diagnostics;
 using System.Windows.Input;
+using Reactive.Bindings;
 
 namespace Captura
 {
@@ -23,20 +24,8 @@ public AboutViewModel(Settings Settings, ILocalizationProvider Loc) : base(Setti
         {
             AppVersion = "v" + Version.ToString(3);
 
-            HyperlinkCommand = new DelegateCommand(Link =>
-            {
-                if (Link is string s)
-                {
-                    try
-                    {
-                        Process.Start(s);
-                    }
-                    catch
-                    {
-                        // Suppress Errors
-                    }
-                }
-            });
+            HyperlinkCommand = new ReactiveCommand<string>()
+                .WithSubscribe(M => Process.Start(M));
         }
     }
 }

src/Captura/ViewModels/ExceptionViewModel.cs

@@ -1,6 +1,9 @@
 using System;
 using System.Collections.ObjectModel;
+using System.Reactive.Linq;
 using System.Windows.Input;
+using Reactive.Bindings;
+using Reactive.Bindings.Extensions;
 using Screna;
 
 namespace Captura
@@ -9,13 +12,11 @@ public class ExceptionViewModel : NotifyPropertyChanged
     {
         public ExceptionViewModel()
         {
-            CopyToClipboardCommand = new DelegateCommand(() =>
-            {
-                if (Exceptions.Count > 0)
-                {
-                    Exceptions[0].ToString().WriteToClipboard();
-                }
-            });
+            CopyToClipboardCommand = Exceptions
+                .ObserveProperty(M => M.Count)
+                .Select(M => M > 0)
+                .ToReactiveCommand()
+                .WithSubscribe(() => Exceptions[0].ToString().WriteToClipboard());
         }
 
         string _message = "An unhandled exception occurred. Here are the details.";

src/Captura/ViewModels/RegionSelectorViewModel.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Drawing;
 using System.Windows.Input;
+using Reactive.Bindings;
 
 // ReSharper disable MemberCanBePrivate.Global
 
@@ -21,25 +22,31 @@ public class RegionSelectorViewModel : NotifyPropertyChanged
 
         public RegionSelectorViewModel()
         {
-            MoveLeftCommand = new DelegateCommand(() => Left -= KeyMoveDelta);
-            MoveRightCommand = new DelegateCommand(() => Left += KeyMoveDelta);
-            MoveUpCommand = new DelegateCommand(() => Top -= KeyMoveDelta);
-            MoveDownCommand = new DelegateCommand(() => Top += KeyMoveDelta);
-
-            IncreaseWidthCommand = new DelegateCommand(() => Width += KeyMoveDelta);
-            DecreaseWidthCommand = new DelegateCommand(() => Width -= KeyMoveDelta);
-            IncreaseHeightCommand = new DelegateCommand(() => Height += KeyMoveDelta);
-            DecreaseHeightCommand = new DelegateCommand(() => Height -= KeyMoveDelta);
+            MoveLeftCommand = new ReactiveCommand()
+                .WithSubscribe(() => Left -= KeyMoveDelta);
+            MoveRightCommand = new ReactiveCommand()
+                .WithSubscribe(() => Left += KeyMoveDelta);
+            MoveUpCommand = new ReactiveCommand()
+                .WithSubscribe(() => Top -= KeyMoveDelta);
+            MoveDownCommand = new ReactiveCommand()
+                .WithSubscribe(() => Top += KeyMoveDelta);
+
+            IncreaseWidthCommand = new ReactiveCommand()
+                .WithSubscribe(() => Width += KeyMoveDelta);
+            DecreaseWidthCommand = new ReactiveCommand()
+                .WithSubscribe(() => Width -= KeyMoveDelta);
+            IncreaseHeightCommand = new ReactiveCommand()
+                .WithSubscribe(() => Height += KeyMoveDelta);
+            DecreaseHeightCommand = new ReactiveCommand()
+                .WithSubscribe(() => Height -= KeyMoveDelta);
         }
 
         public int Left
         {
             get => _left;
             set
             {
-                _left = value;
-
-                OnPropertyChanged();
+                Set(ref _left, value);
                 RaisePropertyChanged(nameof(LeftDip));
             }
         }
@@ -55,9 +62,7 @@ public int Top
             get => _top;
             set
             {
-                _top = value;
-
-                OnPropertyChanged();
+                Set(ref _top, value);
                 RaisePropertyChanged(nameof(TopDip));
             }
         }
@@ -73,9 +78,7 @@ public int Width
             get => _width;
             set
             {
-                _width = Math.Max(value, MinWidth);
-
-                OnPropertyChanged();
+                Set(ref _width, Math.Max(value, MinWidth));
                 RaisePropertyChanged(nameof(WidthDip));
             }
         }
@@ -91,9 +94,7 @@ public int Height
             get => _height;
             set
             {
-                _height = Math.Max(value, MinHeight);
-
-                OnPropertyChanged();
+                Set(ref _height, Math.Max(value, MinHeight));
                 RaisePropertyChanged(nameof(HeightDip));
             }
         }