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Python OpenCV讀取視頻報(bào)錯(cuò)的問(wèn)題解決

更新時(shí)間：2022年01月10日 14:10:13 作者：Hong_Youth

大家好，本篇文章主要講的是Python OpenCV讀取視頻報(bào)錯(cuò)的問(wèn)題解決，感興趣的同學(xué)趕快來(lái)看一看吧，對(duì)你有幫助的話記得收藏一下

最近由于項(xiàng)目的需要，經(jīng)常需要使用opencv讀視頻操作，會(huì)經(jīng)常遇到一個(gè)問(wèn)題，就是視頻讀完之后會(huì)出現(xiàn)報(bào)錯(cuò)的情況，雖然不影響代碼結(jié)果，但是對(duì)于吹毛求疵的我實(shí)在忍受不了。

會(huì)報(bào)錯(cuò)的程序：

# -*-coding:utf-8-*-
"""
File Name: read_video.py
Program IDE: PyCharm
Create File By Author: Hong
"""
import cv2


def read_video(video_path: str):
    """
    OpenCV讀視頻小工具，解決視頻讀完報(bào)錯(cuò)的問(wèn)題
    :param video_path: 輸入需要讀取的視頻文件路徑
    :return: 沒有返回值
    """
    print('視頻路徑：', video_path)
    cap = cv2.VideoCapture(video_path)
    while cap.isOpened():
        # get a frame
        ret, frame = cap.read()

        cv2.imshow("capture", frame)

        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    print('視頻讀完！')
    cap.release()
    cv2.destroyAllWindows()


if __name__ == '__main__':
    path = r'D:\multi_insect_videos\multi_object00.mp4'
    read_video(path)

可以把視頻正常讀完，但是結(jié)果會(huì)輸出錯(cuò)誤

Traceback (most recent call last):
  File "E:/PyCharmDocument/create_ST_image/multi_insect_processing/crop_video_to_images.py", line 76, in <module>
    read_video(path)
  File "E:/PyCharmDocument/create_ST_image/multi_insect_processing/crop_video_to_images.py", line 65, in read_video
    cv2.imshow("capture", frame)
cv2.error: OpenCV(4.5.3) C:\Users\runneradmin\AppData\Local\Temp\pip-req-build-uzca7qz1\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

原因是視頻結(jié)束后，opencv的imshow()函數(shù)讀不了幀就出錯(cuò)了。解決方法：在imshow()之前加入判斷，只有當(dāng)有幀時(shí)才讀，沒有幀時(shí)直接退出循環(huán)。

不會(huì)報(bào)錯(cuò)的代碼：

# -*-coding:utf-8-*-
"""
File Name: read_video.py
Program IDE: PyCharm
Create File By Author: Hong
"""
import cv2


def read_video(video_path: str):
    """
    OpenCV讀視頻小工具，解決視頻讀完報(bào)錯(cuò)的問(wèn)題
    :param video_path: 輸入需要讀取的視頻文件路徑
    :return: 沒有返回值
    """
    print('視頻路徑：', video_path)
    cap = cv2.VideoCapture(video_path)
    while cap.isOpened():
        # get a frame
        ret, frame = cap.read()
        if not ret:
            break
        cv2.imshow("capture", frame)

        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    print('視頻讀完！')
    cap.release()
    cv2.destroyAllWindows()


if __name__ == '__main__':
    path = r'D:\multi_insect_videos\multi_object00.mp4'
    read_video(path)

程序輸出結(jié)果：

視頻路徑： D:\multi_insect_videos\multi_object00.mp4
視頻讀完！

Process finished with exit code 0

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