cannot open webcam from Linux guest in Virtualbox

My goal is to be able to capture an image using a Logitech hd C270 webcam on Ubuntu 20.04 using OpenCV but I'm encountering a problem that I don't understand.

Here is my program:

import cv2def capture_image(device_path, ouput) :     cap = cv2.VideoCapture(device_path)    if not cap.isOpened():        print("Error open the device")        return     ret, frame = cap.read()    print(ret)    print(frame)    if not ret:        print("Error capture image")        return    cv2.imwrite(ouput, frame)    cap.release    print("imahe capturée")if __name__ == "__main__":    device_path = "/dev/video0"    ouput = "image.jpg"       capture_image(device_path, ouput) `

When I launch my program, ret is False and frame is None.

This is my OS:

Linux nahel-VirtualBox 5.15.0-105-generic #115~20.04.1-Ubuntu SMP Mon Apr 15 17:33:04 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

nahel@nahel-VirtualBox:/$ v4l2-ctl --list-deviceC270 HD WEBCAM (usb-0000:00:06.0-2):/dev/video0/dev/video1

nahel@nahel-VirtualBox:/$ v4l2-ctl -VFormat Video Capture:Width/Height      : 640/480Pixel Format      : 'YUYV' (YUYV 4:2:2)Field             : NoneBytes per Line    : 1280Size Image        : 614400Colorspace        : sRGBTransfer Function : Rec. 709YCbCr/HSV Encoding: ITU-R 601Quantization      : Default (maps to Limited Range)Flags             :

nahel@nahel-VirtualBox:/$ v4l2-ctl --list-formatsioctl: VIDIOC_ENUM_FMTType: Video Capture[0]: 'YUYV' (YUYV 4:2:2)[1]: 'MJPG' (Motion-JPEG, compressed)

I tried my code on Windows and it worked.

Yes, I work with VirtualBox and Visual Studio code.

and here is the information obtained with V4L2

nahel@nahel-VirtualBox:/$ v4l2-compliancev4l2-compliance SHA: not available, 64 bitsCompliance test for uvcvideo device /dev/video0:Driver Info:Driver name      : uvcvideoCard type        : C270 HD WEBCAMBus info         : usb-0000:00:06.0-2Driver version   : 5.15.148Capabilities     : 0x84a00001Video CaptureMetadata CaptureStreamingExtended Pix FormatDevice CapabilitiesDevice Caps      : 0x04200001Video CaptureStreamingExtended Pix FormatRequired ioctls:test VIDIOC_QUERYCAP: OKAllow for multiple opens:test second /dev/video0 open: OKtest VIDIOC_QUERYCAP: OKtest VIDIOC_G/S_PRIORITY: OKtest for unlimited opens: OKDebug ioctls:test VIDIOC_DBG_G/S_REGISTER: OK (Not Supported)test VIDIOC_LOG_STATUS: OK (Not Supported)Input ioctls:test VIDIOC_G/S_TUNER/ENUM_FREQ_BANDS: OK (Not Supported)test VIDIOC_G/S_FREQUENCY: OK (Not Supported)test VIDIOC_S_HW_FREQ_SEEK: OK (Not Supported)test VIDIOC_ENUMAUDIO: OK (Not Supported)test VIDIOC_G/S/ENUMINPUT: OKtest VIDIOC_G/S_AUDIO: OK (Not Supported)Inputs: 1 Audio Inputs: 0 Tuners: 0Output ioctls:test VIDIOC_G/S_MODULATOR: OK (Not Supported)test VIDIOC_G/S_FREQUENCY: OK (Not Supported)test VIDIOC_ENUMAUDOUT: OK (Not Supported)test VIDIOC_G/S/ENUMOUTPUT: OK (Not Supported)test VIDIOC_G/S_AUDOUT: OK (Not Supported)Outputs: 0 Audio Outputs: 0 Modulators: 0Input/Output configuration ioctls:test VIDIOC_ENUM/G/S/QUERY_STD: OK (Not Supported)test VIDIOC_ENUM/G/S/QUERY_DV_TIMINGS: OK (Not Supported)test VIDIOC_DV_TIMINGS_CAP: OK (Not Supported)test VIDIOC_G/S_EDID: OK (Not Supported)Control ioctls (Input 0):test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OKtest VIDIOC_QUERYCTRL: OKfail: v4l2-test-controls.cpp(445): s_ctrl returned an error (13)test VIDIOC_G/S_CTRL: FAILfail: v4l2-test-controls.cpp(695): s_ext_ctrls returned an error (13)test VIDIOC_G/S/TRY_EXT_CTRLS: FAILtest VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: OKtest VIDIOC_G/S_JPEGCOMP: OK (Not Supported)Standard Controls: 14 Private Controls: 0Format ioctls (Input 0):test VIDIOC_ENUM_FMT/FRAMESIZES/FRAMEINTERVALS: OKtest VIDIOC_G/S_PARM: OKtest VIDIOC_G_FBUF: OK (Not Supported)test VIDIOC_G_FMT: OKtest VIDIOC_TRY_FMT: OKwarn: v4l2-test-formats.cpp(976): Could not set fmt2test VIDIOC_S_FMT: OKtest VIDIOC_G_SLICED_VBI_CAP: OK (Not Supported)test Cropping: OK (Not Supported)test Composing: OK (Not Supported)test Scaling: OK (Not Supported)Codec ioctls (Input 0):test VIDIOC_(TRY_)ENCODER_CMD: OK (Not Supported)test VIDIOC_G_ENC_INDEX: OK (Not Supported)test VIDIOC_(TRY_)DECODER_CMD: OK (Not Supported)Buffer ioctls (Input 0):test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: OKtest VIDIOC_EXPBUF: OKtest Requests: OK (Not Supported)Total for uvcvideo device /dev/video0: 44, Succeeded: 42, Failed: 2, Warnings: 1