VideoCapture from HTC Vive camera?

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Hi,

I'm trying to get frames from the HTC Vive front facing camera but I'm only getting seemingly gray frames out (though they are theoretically not empty).

My code looks like this:

int main() {
VideoCapture videoSource(0);

    Size size{
        (int)videoSource.get(CV_CAP_PROP_FRAME_WIDTH),
        (int)videoSource.get(CV_CAP_PROP_FRAME_HEIGHT)
    };


namedWindow("input", WINDOW_NORMAL);
resizeWindow("input", size.width, size.height);

Mat frameIn;

auto p1 = videoSource.get(CAP_PROP_MODE);
auto p2 = videoSource.get(CAP_PROP_FORMAT);
auto p3 = videoSource.get(CAP_PROP_FPS);
unsigned f = (unsigned)videoSource.get(CV_CAP_PROP_FOURCC);

char fourcc[] = {
    (char)f,
    (char)(f >> 8),
    (char)(f >> 16),
    (char)(f >> 24),
    '\0'
};

cout << "\n\nCAPTURE DEVICE\n---------------"
    << "\nmode: " << p1
    << "\nformat: " << p2
    << "\nfps: " << p3
    << "\nFOURCC: " << string(fourcc)
    << "\nsize: " << size;

// One frame, to check info:
videoSource >> frameIn;

cout << "\n\nFRAME IN (MAT):\n--------------" 
    << "\ntype: " << frameIn.type() 
    << "\ndepth: " << frameIn.depth() 
    << "\nsize: " << frameIn.size();


while (!frameIn.empty()) {
    imshow("input", frameIn);

    char key = waitKey(10);

    if (key == 27) {
        cvDestroyAllWindows();
        break;
    }

    videoSource >> frameIn;
}

return 0;
}

And the output (other than a gray window) is:

CAPTURE DEVICE

mode: 0 format: 0 fps: 30.0003 FOURCC: YUY2 size: [612 x 460]

FRAME IN (MAT):

type: 16 depth: 0 size: [612 x 460]

I'm new to OpenCV so I might be missing something obvious. But from the above, it seems like the camera is being detected. The 4cc is yuy2 though, but it still returns 0 for mode and format.

When I check frameIn.empty() is returns false, but as you can see, there doesn't seem to be anything in the mats.

Any help would be greatly appreciated.