class Program
    {
        private static TimeSpan ts = new TimeSpan(0, 0, 0, 00);
        private static TimeSpan tsAdd = new TimeSpan(0, 0, 0, 30);

        private static string timeSpan = "00:00:30";

        static void Main(string[] args)
        {
            for (int i = 0; i <= 108; i++)
            {
                string fileName = string.Format("{0:00}{1:00}{2:00}.flv", ts.Hours, ts.Minutes, ts.Seconds);
                string startTime = string.Format("{0:00}:{1:00}:{2:00}", ts.Hours, ts.Minutes, ts.Seconds);

                ProcessStartInfo info = new ProcessStartInfo();
                info.FileName = @"C:\ffmpeg";
                info.Arguments = string.Format("-i C:\\Movie.flv -sameq -ss " + startTime + " -t " + timeSpan + " C:\\OutputFolder\\" + fileName);
                info.CreateNoWindow = true;
                info.UseShellExecute = false;

                Process process = Process.Start(info);
                process.WaitForExit();

                if (process.ExitCode != 0)
                {
					//Whatever goes here
                }

                process.Close();
                process.Dispose();

                ts = ts.Add(tsAdd);
            }
        }
    }