WPF play video via VideoDrawing and DrawingImage

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp125
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private double width, height;
        public MainWindow()
        {
            InitializeComponent();
            WindowState = WindowState.Maximized;
            this.Loaded += MainWindow_Loaded;            
        }

        private void InitVideoDrawing()
        {
            MediaPlayer player = new MediaPlayer();
            player.Open(new Uri(@"D:\C\WpfApp125\WpfApp125\Video\v2.mp4", UriKind.Absolute));
            VideoDrawing videoDrawing = new VideoDrawing();
            videoDrawing.Rect = new Rect(0, 0, width, height);
            videoDrawing.Player = player;
            videoDrawing.Player.Play();
            DrawingImage drawingImage = new DrawingImage(videoDrawing);
            Image img = new Image();
            img.Source = drawingImage;
            this.Content = img;
        }

        private void MainWindow_Loaded(object sender, RoutedEventArgs e)
        {
            width = this.ActualWidth;
            height = this.ActualHeight;
            InitVideoDrawing();            
        }
    }
}