var streams = new List();
streams.Add(new VFVEFFMPEGStream { Filename = "c:\\samples\\!video.avi", ID = "v" });
streams.Add(new VFVEFFMPEGStream { Filename = "c:\\samples\\!sophie.mp3", ID = "a" });
streams.Add(new VFVEFFMPEGStream { Filename = "c:\\samples\\!video2.avi", ID = "a" });
VideoEdit1.FastEdit_MuxStreams(streams, true, outputFile);