Question

这是我的代码

import cv2
video_capture = cv2.VideoCapture("test.mpeg")
cv2.convertMaps

while True:
    # get frame by frame
    ret, frame = video_capture.read()
    cv2.imwrite('pic.png',frame)
    cv2.imshow('Video', frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

我收到以下错误：

None

Traceback (most recent call last):
  File "D:/Itellingence Transportation Systems/Material-lab8/home_work8.py", line 12, in <module>
    cv2.imshow('Video', frame)
error: ..\..\..\..\opencv\modules\highgui\src\window.cpp:261: error: (-215) size.width>0 && size.height>0 in function cv::imshow

有什么问题？

Answer 1

简单的回答，我相信。您的循环在视频完成时无法检测到任何内容。最终，在尝试阅读时，video_capture对象将返回False。您应该在循环中检查该条件是否正常退出。

import cv2
video_capture = cv2.VideoCapture("test.mpeg")

while True:
    # get frame by frame
    ret, frame = video_capture.read()
    if not ret:
        break
    cv2.imwrite('pic.png',frame)
    cv2.imshow('Video', frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

我试图使用python逐帧读取视频，以在帧上执行某些进程

1 个答案: