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Asked: 2022-05-02 01:26:15 +0800 CST

Capturing webcam video with OpenCV in WSL2

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I am trying to access my webcam through OpenCV in WSL2 (Ubuntu). I found this blog post where it explains how to connect USB devices to WSL2. Running usbipd wsl list in windows command prompt lists the following devices:

> usbipd wsl list
BUSID  VID:PID    DEVICE                                                        STATE
1-1    0c45:6725  Integrated Webcam                                             Not attached
1-2    046d:c534  USB Input Device                                              Not attached
1-3    0cf3:e007  Qualcomm QCA61x4A Bluetooth                                   Not attached
1-4    27c6:639c  Goodix Moc Fingerprint                                        Not attached
2-2    8564:7000  USB Mass Storage Device                                       Not attached

Here my machine's integrated webcam is a USB device with BUSID 1-1. I ran usbipd wsl attach --busid 1-1 to connect my integrated webcam to WSL.

Now from WSL, typing lsusb lists the devices as follows:

> lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 0c45:6725 Microdia Integrated_Webcam_HD
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

It looks like the integrated webcam has been successfully connected to WSL (listed as Microdia Integrated_Webcam_HD).

This is the code used to access the webcam:

import cv2
import sys

source = cv2.VideoCapture(0)

win_name = 'Camera Preview'
cv2.namedWindow(win_name, cv2.WINDOW_NORMAL)

while cv2.waitKey(1) != 27:  # Escape
    has_frame, frame = source.read()
    if not has_frame:
        break
    cv2.imshow(win_name, frame)

source.release()
cv2.destroyWindow(win_name)

Here cv2.VideoCapture() takes an index as argument. The OpenCV documentation mentions: doc

If I run the code above with 0 as the argument, I get the following output:

[ WARN:[email protected]] global /io/opencv/modules/videoio/src/cap_v4l.cpp (889) open VIDEOIO(V4L2:/dev/video0): can't open camera by index

I have connected USB devices to WSL, but still I am not able to access the integrated webcam. Any ideas how to get around this problem would be much appreciated!

usb

0 Answers