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2020-12-10 22:58:48 -0600	received badge	● Notable Question (source)
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2017-09-14 15:49:03 -0600	asked a question	cv2.fisheye camera calibration (Python) cv2.fisheye camera calibration (Python) I am trying to calibrate wide-angle/fisheye lenses in OpenCV using python and th
2017-08-21 12:12:19 -0600	answered a question	Multi-Cam Support on Raspberry Pi Bump. Any ideas?
2017-08-14 11:28:32 -0600	asked a question	Multi-Cam Support on Raspberry Pi I am running Python 3.4, Open CV 3.2, Raspbian Jessie, and two ELP Mini USB Cameras. When I open the two cameras: `cap0 = cv2.VideoCapture(0) cap1 = cv2.VideoCapture(1)` I get the following error in the console every time, which can cause a variety of issues with displaying/saving the camera images: `VIDIOC_QUERYCTRL: Input/output error VIDIOC_QUERYCTRL: Input/output error` Running dmesg gives: `uvcvideo: Failed to query (GET_DEF) UVC control 2 on unit 2: -110 uvcvideo: Failed to query (GET_DEF) UVC control 3 on unit 2: -110` I am a newbie to OpenCV and raspberry pi/linux, but from what I've been able to gather there's an issue with Video4Linux where it produces the error because it can't distinguish between the two identical cameras plugged in. If I swap one of the cameras out such that there is two different camera models plugged into the Pi the error is no longer produced and everything works reliably. However, I would like to use the two identical cameras. I'm hoping there may be some way to explicitly give camera ID's in VideoCapture(index) rather than just the generic 0 or 1 index. Any insight is greatly appreciated and or any other potential work arounds to prevent the error. Thank you!