Reproducir video en Android usando Xamarin

Encontré la respuesta:

 public class MainActivity : Activity, MediaPlayer.IOnPreparedListener, ISurfaceHolderCallback { MediaPlayer mediaPlayer; protected override void OnCreate (Bundle bundle) { base.OnCreate (bundle); SetContentView (Resource.Layout.Main); var videoView = (VideoView)FindViewById<VideoView> (Resource.Id.videoView); ISurfaceHolder holder = videoView.Holder; holder.SetType (SurfaceType.PushBuffers); holder.AddCallback( this ); var descriptor = Assets.OpenFd("test.ogv"); mediaPlayer = new MediaPlayer (); mediaPlayer.SetDataSource(descriptor.FileDescriptor, descriptor.StartOffset, descriptor.Length); mediaPlayer.Prepare(); mediaPlayer.Looping = true; mediaPlayer.Start(); } public void SurfaceCreated(ISurfaceHolder holder) { Console.WriteLine("SurfaceCreated"); mediaPlayer.SetDisplay(holder); } public void SurfaceDestroyed(ISurfaceHolder holder) { Console.WriteLine("SurfaceDestroyed"); } public void SurfaceChanged(ISurfaceHolder holder, Android.Graphics.Format format, int w, int h) { Console.WriteLine("SurfaceChanged"); } public void OnPrepared(MediaPlayer player) { } } 

 var uri= Android.Net.Uri.Parse("android.resource://" + Application.PackageName + "/" + Resource.Raw.demo); video.SetVideoURI(uri); video.Start();