Final Alltogeter

gistfile1.cs

//we are planning to use filter concatenation on three input videos
var filterchain = Filterchain.FilterTo<VideoStream>(new Concat()); 

//we want our output to be encoded using the following settings:
// -c:v libx264
// -b:v 3000k
// -s 852x480
// -y 
var settings = SettingsCollection.ForOutput(
  new CodecVideo("libx264"), 
  new BitRateVideo(3000), 
  new Size(852, 480), 
  new OverwriteOutput()); 

//we need to create an instance of a command factory.   
var factory = CommandFactory.Create(); 

//staging all input video streams for concatenation, filtering, and mapping to output
factory.CreateOutputCommand()
       .WithInput<VideoStream>("c:/foo/bar1.mp4")
       .WithInput<VideoStream>("c:/foo/bar2.mp4")
       .WithInput<VideoStream>("c:/foo/bar3.mp4")
       .Filter(filterchain)
       .MapTo<Mp4>("c:/foo/bar4.mp4", settings);
       
//the render command will start feeding the commands to FFmpeg
factory.Render();