MediaCapture mediaCapture;
MediaEncodingProfile videoEncodingProperties;protected override async void OnNavigatedTo(NavigationEventArgs e)
{HardwareButtons.CameraHalfPressed += HardwareButtons_CameraHalfPressed;HardwareButtons.CameraReleased += HardwareButtons_CameraReleased;videoCaptrueElement.Source = await Initialize();await mediaCapture.StartPreviewAsync();
}async void HardwareButtons_CameraHalfPressed(object sender, CameraEventArgs e)
{if( mediaCapture != null ){var video = await KnownFolders.VideosLibrary.CreateFileAsync("video.mp4", CreationCollisionOption.GenerateUniqueName);
await mediaCapture.StartRecordToStorageFileAsync(videoEncodingProperties, video);}
}async void HardwareButtons_CameraReleased(object sender, CameraEventArgs e)
{if( mediaCapture != null ){await mediaCapture.StopRecordAsync();}
}private async Task<MediaCapture> Initialize()
{mediaCapture = new MediaCapture();await mediaCapture.InitializeAsync();mediaCapture.VideoDeviceController.PrimaryUse = CaptureUse.Video;videoEncodingProperties = MediaEncodingProfile.CreateMp4(VideoEncodingQuality.Vga);return mediaCapture;
}protected override void OnNavigatedFrom(NavigationEventArgs e)
{if( mediaCapture != null ){mediaCapture.Dispose();mediaCapture = null;}
}

MediaClip video = await MediaClip.CreateFromFileAsync(　　　　　　　　　　　　　　　　await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///thanks.mp4")));MediaComposition videos = new MediaComposition();
videos.Clips.Add(video);BackgroundAudioTrack bgm = await BackgroundAudioTrack.CreateFromFileAsync(　　　　　　　　　　　　　　　　　　　　await StorageFile.GetFileFromApplicationUriAsync(new Uri("Above Your Hand.mp3")));
videos.BackgroundAudioTracks.Clear();
videos.BackgroundAudioTracks.Add(bgm);await videos.SaveAsync(await ApplicationData.Current.LocalFolder.CreateFileAsync("video.mp4", CreationCollisionOption.ReplaceExisting));

var screenCapture = ScreenCapture.GetForCurrentView();mediaCapture = new MediaCapture();
await mediaCapture.InitializeAsync(new MediaCaptureInitializationSettings
{VideoSource = screenCapture.VideoSource,AudioSource = screenCapture.AudioSource,
});var file = await KnownFolders.VideosLibrary.CreateFileAsync("screenrecording.mp4", CreationCollisionOption.ReplaceExisting);
await mediaCapture.StartRecordToStorageFileAsync(MediaEncodingProfile.CreateMp4(VideoEncodingQuality.Auto), file);

if( mediaCapture != null )
{await mediaCapture.StopRecordAsync();mediaCapture.Dispose();mediaCapture = null;
}