minor improvements, code refactorization

JobInfo.cs

@@ -2,32 +2,32 @@
 
 namespace VideoExtractor
 {
-    enum Task
+    public class JobInfo
     {
-        ExtractAudio,
-        RemoveAudio,
-        ExtractImages,
-        ResizeVideo,
-        CropVideo,
-        CreateVideo
-    }
+        public enum ETask
+        {
+            ExtractAudio,
+            RemoveAudio,
+            ExtractImages,
+            ResizeVideo,
+            CropVideo,
+            CreateVideo
+        }
 
-    enum Result
-    {
-        Success,
-        Cancel,
-        Error,
-        NotAvailable
-    }
+        public enum EResult
+        {
+            Success,
+            Cancel,
+            Error,
+            NotAvailable
+        }
 
-    class JobInfo
-    {
         public string Input { get; private set; }
         public string Output { get; private set; }
         public string Arguments { get; private set; }
         public Process Process { get; private set; }
-        public Task Task { get; private set; }
-        public Result Result { get; set; }
+        public ETask Task { get; private set; }
+        public EResult Result { get; set; }
 
         /// <summary>
         /// Constructor
@@ -36,13 +36,13 @@ class JobInfo
         /// <param name="output">output file/folder</param>
         /// <param name="arguments">ffmpeg arguments</param>
         /// <param name="task">task type</param>
-        public JobInfo(string input, string output, string arguments, Task task)
+        public JobInfo(string input, string output, string arguments, ETask task)
         {
             Input = input;
             Output = output;
             Task = task;
             Arguments = arguments;
-            Result = Result.NotAvailable;
+            Result = EResult.NotAvailable;
         }
 
         /// <summary>