python 摄像头 异常,opencvpython摄像头读取错误

我有个错误VIDEOIO ERROR: V4L2: Pixel format of incoming image is unsupported by OpenCV

Unable to stop the stream: Device or resource busy

VIDEOIO ERROR: V4L: can't open camera by index 0

尝试运行代码时import time

import datetime

import cv2

import boto3

rekog = boto3.client('rekognition')

video = cv2.VideoCapture(0)

class VideoCamera(object):

def __init__(self):

# Using OpenCV to capture from device 0. If you have trouble capturing

# from a webcam, comment the line below out and use a video file

# instead.

# self.video = cv2.VideoCapture(0)

# If you decide to use video.mp4, you must have this file in the folder

# as the main.py.

# self.video = cv2.VideoCapture('video.mp4')

print('camera loaded')

def __del__(self):

self.video.release()

def get_frame(self):

# success, image = self.video.read()

success, image = video.read()

overlay = image.copy()

overlayTxt = image.copy()

h, w = image.shape[:2]

regImg = cv2.resize(image, (int(0.2 * w), int(0.2 * h)))

_, newjpeg = cv2.imencode('.jpg', regImg)

imgbytes = newjpeg.tobytes()

t0 = time.time()

resp = rekog.detect_labels(Image={'Bytes': imgbytes})

cv2.rectangle(overlay, (10, 10), (300, 50 + 50 * len(resp['Labels'])), (0, 0, 0), -1)

alpha = 0.3

cv2.addWeighted(overlay, alpha, image, 1 - alpha, 0, image)

cnt = 1

now = str(datetime.datetime.now())

cv2.putText(image, now, (20, 40 * cnt), cv2.FONT_HERSHEY_SIMPLEX, 0.4, (255, 255, 255), 1)

cnt = cnt + 1

for label in resp['Labels']:

outTxt = label['Name'] + ' (' + str(int(label['Confidence'])) + '%)'

cv2.putText(image, outTxt, (20, 40 * cnt), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (255, 255, 255), 1)

cnt = cnt + 1

# We are using Motion JPEG, but OpenCV defaults to capture raw images,

# so we must encode it into JPEG in order to correctly display the

# video stream.

ret, jpeg = cv2.imencode('.jpg', image)

t0 = time.time()

resp = rekog.detect_labels(Image={'Bytes': imgbytes})

print("{} ---> {}".format((time.time() - t0), resp["Labels"]))

return jpeg.tobytes()

摄像头正在工作，在另一个应用程序中进行了测试。在

这些错误的原因是什么？在