python 3。当我在 __init__ 方法中深度复制具有 cv2.VideoCapture 的类的实例时出现错误

Question

这是我的代码。

import cv2
import numpy as np
from copy import deepcopy

class Video:

def __init__(self, path):

    self.name = path.split('/')[-1]
    self.cap = cv2.VideoCapture(path)

当我创建一个 Video 类的实例并尝试对其进行深度复制时，出现此错误。

video = Video('video.mp4')
print(video)
print(deepcopy(video))

错误:

<main.Video object at 0x103496630> Traceback (most recent call last): File "test.py", line 28, in print(deepcopy(video)) File "/Users/tigranfahradyan/.local/share/virtualenvs/pyvideoproc-x3IHrdzn/lib/python3.7/copy.py", line 180, in deepcopy y = _reconstruct(x, memo, *rv) File "/Users/tigranfahradyan/.local/share/virtualenvs/pyvideoproc-x3IHrdzn/lib/python3.7/copy.py", line 280, in _reconstruct state = deepcopy(state, memo) File "/Users/tigranfahradyan/.local/share/virtualenvs/pyvideoproc-x3IHrdzn/lib/python3.7/copy.py", line 150, in deepcopy y = copier(x, memo) File "/Users/tigranfahradyan/.local/share/virtualenvs/pyvideoproc-x3IHrdzn/lib/python3.7/copy.py", line 240, in _deepcopy_dict y[deepcopy(key, memo)] = deepcopy(value, memo) File "/Users/tigranfahradyan/.local/share/virtualenvs/pyvideoproc-x3IHrdzn/lib/python3.7/copy.py", line 169, in deepcopy rv = reductor(4) TypeError: can't pickle cv2.VideoCapture objects

但是当我删除“cv2.VideoCapture(path)”时，一切正常。

import cv2
import numpy as np
from copy import deepcopy

class Video:

    def __init__(self, path):

        self.name = path.split('/')[-1]

输出:

<main.Video object at 0x10d0f7c18> <main.Video object at 0x119693eb8>

Answer 1

我有点想出了解决这个问题的方法，但我确信这不是最好的方法。由于某些原因，当您尝试深度复制字段设置为“cv2.VideoCapture(path_to_video)”的类的实例时，它会出错。

但是你可以有这样的局部变量。

import cv2

class Test:

    def __init__(self):
        cap = cv2.VideoCapture(path_to_video)

        """This will probably give an error for you 
           if you try to deepcopy the instance of this class"""
        # self.cap = cv2.VideoCapture(path_to_video)