init.cs

readonly MediaPlayer _mp;
const string URL = "https://archive.org/download/ImagineDragons_201410/imagine%20dragons.mp4";

public void Init()
{
    // create a libvlc media
    _mp.Media = new Media(_libVLC, URL, Media.FromType.FromLocation);

    // disable video output, we only need audio
    _mp.Media.AddOption(":no-video");

    // subscribe to libvlc playback events
    _mp.TimeChanged += TimeChanged;
    _mp.PositionChanged += PositionChanged;
    _mp.LengthChanged += LengthChanged;
    _mp.EndReached += EndReached;
    _mp.Playing += Playing;
    _mp.Paused += Paused;
}

// when the libvlc mediaplayer events fire, publish an event with the MessagingCenter
private void PositionChanged(object sender, MediaPlayerPositionChangedEventArgs e) =>
    MessagingCenter.Send(MessengerKeys.App, MessengerKeys.Position, e.Position);

private void Paused(object sender, System.EventArgs e) =>
    MessagingCenter.Send(MessengerKeys.App, MessengerKeys.Play, false);

private void Playing(object sender, System.EventArgs e) =>
    MessagingCenter.Send(MessengerKeys.App, MessengerKeys.Play, true);

private void EndReached(object sender, System.EventArgs e) =>
    MessagingCenter.Send(MessengerKeys.App, MessengerKeys.EndReached);

private void LengthChanged(object sender, MediaPlayerLengthChangedEventArgs e) =>
    MessagingCenter.Send(MessengerKeys.App, MessengerKeys.Length, e.Length);

private void TimeChanged(object sender, MediaPlayerTimeChangedEventArgs e) =>
    MessagingCenter.Send(MessengerKeys.App, MessengerKeys.Time, e.Time);