private void SendFrame(Stream output)
{
VideoFrame frame = camera.GetPreviewFrameAsync().Result;
SoftwareBitmap bitmap = SoftwareBitmap.Convert(frame.SoftwareBitmap, BitmapPixelFormat.Bgra8, 0);
byte[] buffer = bitmap.GetEncodedBytes(BitmapEncoder.JpegEncoderId).Result;
output.Write(buffer, 0, buffer.Length);
output.Flush();
}