Python • Cannot open camera by index

Code:

[0:03:00.542245672] [2552]  INFO Camera camera_manager.cpp:284 libcamera v0.1.0+118-563cd78e[0:03:00.571168714] [2562]  WARN RPiSdn sdn.cpp:39 Using legacy SDN tuning - please consider moving SDN inside rpi.denoise[0:03:00.573974638] [2562]  INFO RPI vc4.cpp:444 Registered camera /base/soc/i2c0mux/i2c@1/ov5647@36 to Unicam device /dev/media0 and ISP device /dev/media1[0:03:00.574054305] [2562]  INFO RPI pipeline_base.cpp:1142 Using configuration file '/usr/share/libcamera/pipeline/rpi/vc4/rpi_apps.yaml'[0:03:00.578403164] [2552]  INFO Camera camera_manager.cpp:284 libcamera v0.1.0+118-563cd78e[0:03:00.606613276] [2565]  WARN RPiSdn sdn.cpp:39 Using legacy SDN tuning - please consider moving SDN inside rpi.denoise[0:03:00.608878048] [2565]  INFO RPI vc4.cpp:444 Registered camera /base/soc/i2c0mux/i2c@1/ov5647@36 to Unicam device /dev/media0 and ISP device /dev/media1[0:03:00.608954253] [2565]  INFO RPI pipeline_base.cpp:1142 Using configuration file '/usr/share/libcamera/pipeline/rpi/vc4/rpi_apps.yaml'[0:03:00.614843528] [2552]  INFO Camera camera.cpp:1183 configuring streams: (0) 640x480-XRGB8888 (1) 640x480-SGBRG10_CSI2P[0:03:00.615262457] [2565]  INFO RPI vc4.cpp:608 Sensor: /base/soc/i2c0mux/i2c@1/ov5647@36 - Selected sensor format: 640x480-SGBRG10_1X10 - Selected unicam format: 640x480-pGAA[ WARN:0@2.620] global cap_v4l.cpp:997 open VIDEOIO(V4L2:/dev/video0): can't open camera by index[ WARN:0@2.624] global obsensor_stream_channel_v4l2.cpp:82 xioctl ioctl: fd=67, req=-2140645888[ WARN:0@2.624] global obsensor_stream_channel_v4l2.cpp:138 queryUvcDeviceInfoList ioctl error return: 25[ERROR:0@2.626] global obsensor_uvc_stream_channel.cpp:159 getStreamChannelGroup Camera index out of range

Code:

import cv2import numpy as npimport dlibfrom imutils import face_utilsfrom picamera2 import Picamera2import RPi.GPIO as GPIObuzzer_pin = 16picam2 = Picamera2()picam2.configure(picam2.create_video_configuration(main={"format": 'XRGB8888', "size": (640, 480)}))picam2.start()GPIO.setmode(GPIO.BOARD)GPIO.setwarnings(False)GPIO.setup(buzzer_pin, GPIO.OUT)GPIO.output(buzzer_pin, GPIO.LOW)cap = cv2.VideoCapture(0)detector = dlib.get_frontal_face_detector()predictor = dlib.shape_predictor("shape_predictor_68_face_landmarks.dat")sleep = 0drowsy = 0active = 0status = ""color = (0, 0, 0)def compute(ptA, ptB):    dist = np.linalg.norm(ptA - ptB)    return distdef blinked(a, b, c, d, e, f):    up = compute(b, d) + compute(c, e)    down = compute(a, f)    ratio = up/(2.0*down)    if(ratio > 0.25):        return 2    elif(ratio > 0.21 and ratio <= 0.25):        return 1    else:        return 0while True:    frame = vs.read()    frame = imutils.resize(frame, width=450)    gray = cv2.cvtColor(im, cv2.COLOR_BGR2GRAY)    faces = detector(gray)    face_frame = frame.copy()    for face in faces:        x1 = face.left()        y1 = face.top()        x2 = face.right()        y2 = face.bottom()                cv2.rectangle(face_frame, (x1, y1), (x2, y2), (0, 255, 0), 2)        landmarks = predictor(gray, face)        landmarks = face_utils.shape_to_np(landmarks)        left_blink = blinked(landmarks[36], landmarks[37],                             landmarks[38], landmarks[41], landmarks[40], landmarks[39])        right_blink = blinked(landmarks[42], landmarks[43],                              landmarks[44], landmarks[47], landmarks[46], landmarks[45])        if(left_blink == 0 or right_blink == 0):            sleep += 1            drowsy = 0            active = 0            if(sleep > 6):                status = "SLEEPING !!!"                color = (255, 0, 0)                GPIO.output(buzzer_pin, GPIO.HIGH)        elif(left_blink == 1 or right_blink == 1):            sleep = 0            active = 0            drowsy += 1            if(drowsy > 6):                status = "Drowsy !"                color = (0, 0, 255)                GPIO.output(buzzer_pin, GPIO.HIGH)        else:            drowsy = 0            sleep = 0            active += 1            if(active > 6):                status = "Active :)"                color = (0, 255, 0)                GPIO.output(buzzer_pin, GPIO.LOW)        cv2.putText(frame, status, (100, 100),                    cv2.FONT_HERSHEY_SIMPLEX, 1.2, color, 3)        for n in range(0, 68):            (x, y) = landmarks[n]            cv2.circle(face_frame, (x, y), 1, (255, 255, 255), -1)    cv2.imshow("Frame", frame)    cv2.imshow("Result of detector", face_frame)    key = cv2.waitKey(1)    if key == 27:        break