title: Concatenation error: Cannot concatenate media using NReco Video Converter for .NET (C#)
body: <p>I want to concatenate two videos into one using Video Converter for .NET (C#) FFMpeg wrapper
  but I have got "cannot concatenate media" exception.. am i missing something or not..
  Here is my Source Code:</p>
  
  <pre><code> var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
      NReco.VideoConverter.ConcatSettings set = new NReco.VideoConverter.ConcatSettings();
  
      string videoRootPath = @"E:\Sam\Recording Feature\WebApplication2\WebApplication2\Video\";
      string tobename = "test";
  
      string[] _fileNames = { @"E:\Sam\Recording Feature\WebApplication2\WebApplication2\Video\1.mov",
                                          @"E:\Sam\Recording Feature\WebApplication2\WebApplication2\Video\2.mov"};
  
      ffMpeg.ConcatMedia(_fileNames, videoRootPath + tobename + ".mov", NReco.VideoConverter.Format.mov, set);
  </code></pre>
  
  <p>Please Help</p>