Added some README sections about PATH's and updated PATH detection

README.md

@@ -28,8 +28,9 @@ Following the below directions for getting the depedencies you might need:
 
 **.NET**: You should already have this.
 
-You'll need to add the MKVToolnix to your PATH as well. To do this:
+If you get issues with "MKVToolnix" not found, you'll need to add the MKVToolnix to your PATH as well. The application will try and out detect it and will succeed if you use the above installer version.
 
+Otherwise, do this:
 
 Select Computer from the Start menu (or hold Windows key and press Break), choose "Advanced System Settings", then the Advanced tab. Click on Environment Variables. Under System Variables, find PATH, and click on it. In the Edit window, modify PATH by adding a semicolon ";" at the end and then the path to your MKVtoolnix installation, e.g. C:\Program Files (x86)\MKVToolNix (wherever you installed it to, this should be different for different drive letters or 64 bit)
 
@@ -75,6 +76,7 @@ After installing all the depedencies, just run the application.
 
 The check boxes should be left unchecked for the most part unless you have a particular issue with a release. You can play around with them and file a bug report if a certain MKV file is not working.
 
+
 # I found a bug/the application doesn't Unlink my MKV's properly. Help?
 
 You can post the issue with a verbose log on the issue tracker. Tick the "verbose output" checkbox in the options when doing the run before posting a log on the issue tracked. If the issue is part of the UnlinkMKV core, it will be addressed there. Otherwise, it will be addressed here. 

UnlinkMKV-GUI/UnlinkMKV-GUI/FormApplication.cs

@@ -22,7 +22,7 @@ public partial class FormApplication : Form
         public FormApplication()
         {
             InitializeComponent();
-            
+
             textOutput.Text = Properties.Settings.Default["output"].ToString();
             textInput.Text = Properties.Settings.Default["input"].ToString();
 
@@ -34,7 +34,7 @@ public FormApplication()
                 Directory.CreateDirectory(defaultPath);
                 textOutput.Text = defaultPath;
             }
-  
+
             // Create our options
             CreateOptions();
         }
@@ -45,8 +45,23 @@ private void CreateOptions()
 
             var optionList = new List<Tuple<string, string>>();
 
-            optionList.Add(Tuple.Create("Fix audio", "--fix-audio"));
-            optionList.Add(Tuple.Create("Fix video", "--fix-video"));
+            bool foundMpeg = true;
+
+            try
+            {
+                PathUtility.FindExePath("ffmpeg.exe");
+            }
+            catch (FileNotFoundException exception)
+            {
+                foundMpeg = false;
+            }
+
+            if (foundMpeg)
+            {
+                optionList.Add(Tuple.Create("Fix audio", "--fix-audio"));
+                optionList.Add(Tuple.Create("Fix video", "--fix-video"));
+            }
+
             optionList.Add(Tuple.Create("Fix subtitles", "--fix-subtitles"));
             optionList.Add(Tuple.Create("Ignore default flag", "--ignore-default-flag"));
             optionList.Add(Tuple.Create("Ignore missing segments", "--ignore-missing-segments"));
@@ -184,17 +199,26 @@ private void PerformJob()
                 var quotedFile = "\"" + file + "\"";
                 var argument = "\"" + perlScript + "\" " + perlParams + " " + outDirectory + " " + quotedFile;
 
-                var perlJob = new Process
+                // PathUtility.ExceptionalPath
+                var startInfo = new ProcessStartInfo
+                {
+                    FileName = perlPath,
+                    Arguments = argument,
+                    UseShellExecute = false,
+                    RedirectStandardOutput = true,
+                    RedirectStandardError = true,
+                    CreateNoWindow = true
+                };
+
+                // Add the path if required to the Perl executing path
+                if (!string.IsNullOrEmpty(PathUtility.ExceptionalPath))
+                {
+                    startInfo.EnvironmentVariables["PATH"] = PathUtility.ExceptionalPath;
+                }
+
+                var perlJob = new Process()
                 {
-                    StartInfo = new ProcessStartInfo
-                    {
-                        FileName = perlPath,
-                        Arguments = argument,
-                        UseShellExecute = false,
-                        RedirectStandardOutput = true,
-                        RedirectStandardError = true,
-                        CreateNoWindow = true
-                    }
+                    StartInfo = startInfo
                 };
 
 

UnlinkMKV-GUI/UnlinkMKV-GUI/FormValidator.cs

@@ -26,8 +26,8 @@ public FormValidator()
         private void CheckRequirements()
         {
             var validatorTasks = new List<IValidatorTask>();
-            validatorTasks.Add(new MkvToolNixValidatorTask());
             validatorTasks.Add(new IsAdministratorValidatorTask());
+            validatorTasks.Add(new MkvToolNixValidatorTask());;
             validatorTasks.Add(new PerlExistsValidatorTask());
 
             foreach (var task in validatorTasks)

UnlinkMKV-GUI/UnlinkMKV-GUI/PathUtility.cs

@@ -9,6 +9,11 @@ namespace UnlinkMKV_GUI
 {
     public static class PathUtility
     {
+
+
+        public static string ExceptionalPath = "";
+
+
         // Thanks!
         // http://csharptest.net/526/how-to-search-the-environments-path-for-an-exe-or-dll/
 

UnlinkMKV-GUI/UnlinkMKV-GUI/Valdiators/Validators.cs

@@ -18,15 +18,14 @@ public string GetStatusText()
 
         public bool IsRequirementMet()
         {
-            
+
             // Check for the path's to the tools we required
             try
             {
 
                 PathUtility.FindExePath("mkvextract.exe");
                 PathUtility.FindExePath("mkvinfo.exe");
                 PathUtility.FindExePath("mkvmerge.exe");
-                PathUtility.FindExePath("ffmpeg.exe");
             }
             catch (FileNotFoundException exception)
             {
@@ -38,6 +37,51 @@ public bool IsRequirementMet()
 
         public bool AttemptFixRequirement()
         {
+            int p = (int)Environment.OSVersion.Platform;
+            if ((p == 4) || (p == 6) || (p == 128))
+            {
+                return false;
+            }
+
+
+            // Attempt to find them in the path and adjust the path silently, so there's no errors    
+
+
+            // It looks like it was installed on C:
+            foreach (var drive in Directory.GetLogicalDrives())
+            {
+                var hasNixInstalled = string.Format(@"{0}Program Files (x86)\MKVToolNix\", drive);
+
+                if (Directory.Exists(hasNixInstalled) && File.Exists(Path.Combine(hasNixInstalled, "mkvinfo.exe")))
+                {
+                    var modPath = Environment.GetEnvironmentVariable("PATH") + ";" + hasNixInstalled;
+
+                    // OK, looks like it was installed in the default directory
+                    Environment.SetEnvironmentVariable("PATH",
+                        modPath);
+
+                    PathUtility.ExceptionalPath = modPath;
+
+                    return true;
+                }
+
+
+                var hasNixInstalled32 = string.Format(@"{0}Program Files\MKVToolNix\", drive);
+
+
+                if (Directory.Exists(hasNixInstalled32) && File.Exists(Path.Combine(hasNixInstalled32, "mkvinfo.exe")))
+                {
+                    var modPath = Environment.GetEnvironmentVariable("PATH") + ";" + hasNixInstalled32;
+                    // OK, looks like it was installed in the default directory
+                    Environment.SetEnvironmentVariable("PATH",
+                        modPath);
+
+                    PathUtility.ExceptionalPath = modPath;
+
+                    return true;
+                }
+            }
+
             MessageBox.Show(
                 "MKVToolNix and/or FFMPEG are missing from your system path. Please refer to the manual provided to install them for your platform.");
             return false;
@@ -85,7 +129,7 @@ public bool IsRequirementMet()
             // Check for the path's to the tools we required
             try
             {
-           
+
 
                 PathUtility.FindExePath("perl.exe");
             }