Program.cs

using MediaToolkit;
using MediaToolkit.Model;
public class Program
{

    public static int PlayListTotalTimer(string path)
    {
        int playListTotalRunningTime = 0;
        if (!Directory.Exists(path))
        {
            return -1;
        }

        string[] videoExtensions = { ".mp4", ".avi", ".mov", ".mkv", ".flv", ".wmv", ".webm", ".mpeg", ".mpg" };
        string[] files = Directory.GetFiles(path,"*.*",SearchOption.AllDirectories)
            .Where(file=> videoExtensions.Contains(Path.GetExtension(file).ToLower())).ToArray();

        if (files.Length > 0)
        {
            Console.WriteLine("Video Files and Duration:");

            foreach (string file in files)
            {
                var inputFile = new MediaFile { Filename = file };
                using (var engine = new Engine()) // MediaToolkit Engine
                {
                    engine.GetMetadata(inputFile);
                    Console.WriteLine($"{Path.GetFileName(file)} - Duration: {inputFile.Metadata.Duration}");
                    playListTotalRunningTime += (int)inputFile.Metadata.Duration.TotalSeconds;
                }
            }
        }
        else
        {
            Console.WriteLine("\nNo Video file found");
        }
        return playListTotalRunningTime;

    }
    public static void Main(string[] args)
    {
        Console.WriteLine("PlaylistTotalTimer");
        string? path = Console.ReadLine();
        if (path == null)
        {
            Console.WriteLine("Please give the proper path");
        }
        int playListTimeLength = PlayListTotalTimer(path);

        if (playListTimeLength == -1)
        {
            Console.WriteLine("Invalid path. Please enter correct path and try again...");
        }

        Console.WriteLine($"Total PlayListLength : {playListTimeLength / 3600} hr: {(playListTimeLength%3600)/60} mins: {((playListTimeLength % 3600) / 60 )% 60} sec" );
        Console.WriteLine($"{Environment.NewLine} Thankyou... for using PlayListTotalTimer...");
    }
}