Convert from RGB to YUYV to OpenCV

Question

Is there any way to convert from RGB to YUYV (YUY 4: 2: 2) format? I noticed that OpenCV has the opposite operation, but not RGB for YUYV for some reason. Maybe someone can point out the code that does this (even outside of the OpenCV library)?

UPDATE

I found a libyuv library that can work for this purpose by making BGR to convert ARGB and then ARGB to YUY2 format (hopefully this is the same as YUYV 4: 2: 2). But it doesn't seem to work. Do you happen to know what the size / type of the yuyv buffer looks like? What is his step?

To clarify YUYV and YUY2, these are the same formats if that helps.

UPDATE 2 Here is my libyuv library usage code:

  Mat frame;
  // Convert original image im from BGR to BGRA for further use in libyuv
  cvtColor(im, frame, CVX_BGR2BGRA);
  // Actually libyuv requires ARGB (i.e. reverse of BGRA), so I swap channels here
  int from_to[] = { 0,3, 1,2, 2,1, 3,0 };
  mixChannels(&frame, 1, &frame, 1, from_to, 4);
  // This is the most confusing part. Not sure what argb_stride suppose to be - length of a row in bytes or size of single value in the array?
  const uint8_t* argb_data = frame.data;
  int argb_stride = 8;

  // Also it is not clear what size of yuyv frame should be since we duplicate one Y 
  Mat yuyv(frame.rows, frame.cols, CVX_8UC2);
  uint8_t* yuyv_data = yuyv.data;
  int yuyv_stride = 16;
  // Do actual conversion
  libyuv::ARGBToYUY2(argb_data, argb_stride, yuyv_data, yuyv_stride, 
  frame.cols, frame.rows);
  // Then I feed yuyv_data to video stream buffer and see green or purple image instead of video stream.

UPDATE 3

  Mat frame;
  cvtColor(im, frame, CVX_BGR2BGRA);

  // ARGB
  int from_to[] = { 0,3, 1,2, 2,1, 3,0 };
  Mat rgba(frame.size(), frame.type());
  mixChannels(&frame, 1, &rgba, 1, from_to, 4);
  const uint8_t* argb_data = rgba.data;
  int argb_stride = rgba.cols*4;

  Mat yuyv(rgba.rows, rgba.cols, CVX_8UC2);
  uint8_t* yuyv_data = yuyv.data;
  int yuyv_stride = width * 2;
  int res = libyuv::ARGBToYUY2(argb_data, argb_stride, yuyv_data, yuyv_stride, rgba.cols, rgba.rows);

Answer 1

, ARGBToYUY2, BGRA ( ).