.m4a file showing duration 0:0 while its size is 1690 KB

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C#

Hi all,

I have an issue while reading duration of m4a file using C#
its showing me 0.0 duration while its size is more than 1600 Kb
can anyone guide me about what the actual reason of this type of file.
in the same code other m4a files calculate the correct duration.
your quick response will be appreciated
Thanks in advance.
[Wajid Hussain]

What I have tried:

here is code that i m trying

ShellFile so = ShellFile.FromFilePath(fromPath);
               double nanoseconds;
               double.TryParse(so.Properties.System.Media.Duration.Value.ToString(), out nanoseconds);
               Console.WriteLine("NanaoSeconds: {0}", nanoseconds);
               if (nanoseconds > 0)
               {
                   // double milliseconds = nanoseconds * 0.000001;
                   double seconds = Convert100NanosecondsToMilliseconds(nanoseconds) / 1000;
                   string duration=  Convert.ToInt64(seconds) / 60 + ":" + Convert.ToInt64(seconds) % 60;
                   Console.WriteLine(duration.ToString());
               }