I have a very strange question with xamarin.form and libvlcsharp - xamarin.forms

Question

When I create LibVLC and MediaPlayer objects in the constructor and play the video, there is only sound but no image. When I create LibVLC and MediaPlayer objects in the'Play' function, there are sounds and images. I don't want to create a MediaPlayer object every time the play function is called. what should I do?
using System;
using System.ComponentModel;
using System.Windows.Input;
using LibVLCSharp.Shared;
using static Xamarin.Essentials.Permissions;
namespace MediaElement
{
/// <summary>
/// Represents the main viewmodel.
/// </summary>
public class MainViewModel : INotifyPropertyChanged
{
/// <summary>
/// Property changed event
/// </summary>
public event PropertyChangedEventHandler PropertyChanged;
/// <summary>
/// Initializes a new instance of <see cref="MainViewModel"/> class.
/// </summary>
public MainViewModel()
{
Core.Initialize();
LibVLC = new LibVLC();
MediaPlayer = new MediaPlayer(LibVLC) { EnableHardwareDecoding = true };
}
private LibVLC _libVLC;
/// <summary>
/// Gets the <see cref="LibVLCSharp.Shared.LibVLC"/> instance.
/// </summary>
public LibVLC LibVLC
{
get => _libVLC;
private set => Set(nameof(LibVLC), ref _libVLC, value);
}
private MediaPlayer _mediaPlayer;
/// <summary>
/// Gets the <see cref="LibVLCSharp.Shared.MediaPlayer"/> instance.
/// </summary>
public MediaPlayer MediaPlayer
{
get => _mediaPlayer;
private set => Set(nameof(MediaPlayer), ref _mediaPlayer, value);
}
/// <summary>
/// Initialize LibVLC and playback when page appears
/// </summary>
public void Play(String path)
{
MediaPlayer.Play(new LibVLCSharp.Shared.Media(LibVLC, new Uri(path)));
}
private void Set<T>(string propertyName, ref T field, T value)
{
if (field == null && value != null || field != null && !field.Equals(value))
{
field = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}

Answer 1

You only sent half of your code, we don't know how you are using your VideoView control.
As a general rule of thumb:
How do you attach the MediaPlayer to your view?
Do you properly wait for the view to be visible before calling Play?
Have a look at the samples here and compare to see what you did wrong.