private static void Main(string[] args) { var a = new AutioTools(); var e = Path.GetFullPath(@"C:\ffmpeg\bin\ffmpeg.exe"); var i = Path.GetFullPath(@"d:\55384dd8-cef7-4a1b-a631-b715048d05e6.mp3"); var duration = a.GetLength(e, i); if (!String.IsNullOrEmpty(duration)) { var ts = TimeSpan.Parse(duration); Console.WriteLine(ts.TotalSeconds); } Console.ReadLine(); }