Logitech Brio OpenCV Capture Settings - opencv

Question

I'm trying to record from a Logitech Brio at 60fps, preferably at 1080p.
It should work because I can get it working on OBS and many others have achieved the settings.
Here is the code I am using to try to capture at this rate:
// Do some grabbing
cv::VideoCapture video_capture;
video_capture.set(cv::CAP_PROP_FRAME_WIDTH, 1920);
video_capture.set(cv::CAP_PROP_FRAME_HEIGHT, 1080);
video_capture.set(cv::CAP_PROP_FPS, 60);
{
INFO_STREAM("Attempting to capture from device: " << device);
video_capture = cv::VideoCapture(device);
// Read a first frame often empty in camera
cv::Mat captured_image;
video_capture >> captured_image;
}
if (!video_capture.isOpened())
{
FATAL_STREAM("Failed to open video source");
return 1;
}
else INFO_STREAM("Device or file opened");
cv::Mat captured_image;
video_capture >> captured_image;
What should I be doing differently for the Brio?

Answer 1

I had the same problem: same camera, couldn't change resolution or fps . After hours of working on this and digging the internet I found a solution:
Need to use DSHOW and need to instead read from capture device 1 (instead of 0). Code below for reference
fourcc = cv2.VideoWriter_fourcc('M','J','P','G')
cap = cv2.VideoCapture()
cap.open(cameraNumber + 1 + cv2.CAP_DSHOW)
cap.set(cv2.CAP_PROP_FOURCC, fourcc)
cap.set(cv2.CAP_PROP_FRAME_WIDTH, 1920)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 1080)
cap.set(cv2.CAP_PROP_FPS, 60)
sorry I only did this in Python, but I hope the same solution works in c++
I assume you can do something along the lines of
video_capture = cv::VideoCapture(device + 1 + cv::CAP_DSHOW);

Answer 2

With OpenCV 4.1.0, this achieved 4K video under Windows, with my Logitech BRIO. The important thing in the end seemed to be to use CAP_DSHOW and to set the resolution after initialising the camera, not before.
cv::VideoCapture capture;
capture = cv::VideoCapture(cv::CAP_DSHOW);
if (!capture.isOpened())
{
cerr << "ERROR: Can't initialize camera capture" << endl;
return 1;
}
capture.set(cv::CAP_PROP_FRAME_WIDTH, 3840);
capture.set(cv::CAP_PROP_FRAME_HEIGHT, 2160);
capture.set(cv::CAP_PROP_FPS, 30);

Answer 3

I think the problem has nothing to do with the camera. The code might not work because you are creating a separate scope for opening the video capture. Upon exiting that scope, the destructor of video_capture instance will be called and therefore the !isOpened() check will always return true. I can't understand why you use those braces. Instead it should be:
INFO_STREAM("Attempting to capture from device: " << device);
auto video_capture = cv::VideoCapture(device);
if (!video_capture.isOpened())
{
FATAL_STREAM("Failed to open video source");
return 1;
}
cv::Mat captured_image;
video_capture.set(cv::CAP_PROP_FRAME_WIDTH, 1920);
video_capture.set(cv::CAP_PROP_FRAME_HEIGHT, 1080);
video_capture.set(cv::CAP_PROP_FPS, 60);
INFO_STREAM("Device or file opened");
video_capture >> captured_image;

Answer 4

After some troubleshooting of my own, I found that #ffarhour's solution worked for me.
fourcc = cv2.VideoWriter_fourcc('M','J','P','G')
cap = cv2.VideoCapture()
cap.open(cameraNumber + 1 + cv2.CAP_DSHOW)
cap.set(cv2.CAP_PROP_FOURCC, fourcc)
cap.set(cv2.CAP_PROP_FRAME_WIDTH, 1920)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 1080)
cap.set(cv2.CAP_PROP_FPS, 60)
But for anyone troubleshooting this in the future, I also want to add that you need a good USB cable and preferably direct access to a usb 3.0 port. I had the camera in my dock first, and only 1080p worked.
A good check is the windows 10 built in camera tool. My experience is that high resolutions will only show as options here, if your cable and usb port support it. So do not bother with Opencv if this does not work first.
Aditionally for those just starting out: the code snippit above goes before your opencv while loop. and Inside your while loop you add:
while True:
ret, frame = cap.read()
frame = cv2.cvtColor(frame, 1)
cv2.imshow('original image', frame)
cv2.waitKey(2)
Finally I want to note that 30 fps worked best for me (better than 24 fps) and that the max available resolution from the camera is NOT 3840 x 2160 pixel but 4096 x 2160, how cool is that?
I also strongly advise to download the logitech driver for brio called 'logitech camera settings' it allows you to set the FOV, autofocus and other things you otherwise could never access.