public static extern IntPtr Concatenate(string firstInputFilename, string secondInputFilename, string outputFilename, ProgressCallback fProgressCallback, OperationCompleteCallback fEofCallback, ErrorCallback fErrorCallback);
public static extern IntPtr Cut(string inputFilename, string outputFilename, int startCutTime, int endCutTime, ProgressCallback fProgressCallback, OperationCompleteCallback fEofCallback, ErrorCallback fErrorCallback);