private async Task initCamera(CameraSensorLocation sensorLocation) { Windows.Foundation.Size res = new Windows.Foundation.Size(MediaElementWidth, MediaElementHeight); CameraOff(); camera = await AudioVideoCaptureDevice.OpenForVideoOnlyAsync(sensorLocation, res); await camera.SetPreviewResolutionAsync(res); frameBitmap = new WriteableBitmap((int)camera.PreviewResolution.Width, (int)camera.PreviewResolution.Height); }