How I Get Duration (Flv) At Mvc 4?

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C#

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How i get duration at mvc-4 ??

i read all of posts , but i cant add some of dlls and some of dlls do not work .

now i am using:

from

Microsoft.WindowsAPICodePack.Shell

and

Microsoft.WindowsAPICodePack.Shell.PropertySystem

these namespace get me just duration of mp-3 . but do not get duration *.flv. This code is for mp3 :

using Microsoft.WindowsAPICodePack.Shell;
using Microsoft.WindowsAPICodePack.Shell.PropertySystem;

public static double Convert100NanosecondsToMilliseconds(double nanoseconds)
{
    return nanoseconds * 0.0001;
}

below code is in my action :

var fle = "Path of mp3";
ShellFile so = ShellFile.FromFilePath(fle);
double nanoseconds;
double.TryParse(so.Properties.System.Media.Duration.Value.ToString(), out nanoseconds);
if (nanoseconds > 0 )
{
    double seconds = Convert100NanosecondsToMilliseconds(nanoseconds) / 1000;
    double time = Math.Round(seconds / 60, 1);
    string res = time.ToString();
}

my visual studio is 2013 .
my windows is 8 .