public async void setSourceAsync(string link, MediaPlayer mediaElement)
{
YouTube youTube = YouTube.Default;
YouTubeVideo video = null;
video = await youTube.GetVideoAsync(link);
Debug.WriteLine("Download Display: " + video.Resolution + ", AudioBit: " + video.AudioBitrate + ", 포맷: " + video.Format);
var memStream = new MemoryStream();
await(await video.StreamAsync()).CopyToAsync(memStream);
memStream.Position = 0;
mediaElement.Source = MediaSource.CreateFromStream(memStream.AsRandomAccessStream(), video.FileExtension);
mediaElement.Play();
}