Python:从视频中截取屏幕截图

Question

这个想法是，用户应该能够从本地计算机加载视频并告诉程序每 5 秒或 30 秒从视频中截取一次屏幕截图。有没有图书馆可以帮助我完成这项任务？任何有关如何进行的想法都会有所帮助。

Answer 1

通过发出以下命令安装 opencv-python (这是一个非官方的 Python 预构建 OpenCV 包):

pip install opencv-python

# Importing all necessary libraries
import cv2
import os
import time

# Read the video from specified path
cam = cv2.VideoCapture("C:/Users/User/Desktop/videoplayback.mp4")

try:

    # creating a folder named data
    if not os.path.exists('data'):
        os.makedirs('data')

    # if not created then raise error
except OSError:
    print('Error: Creating directory of data')

# frame
currentframe = 0

while (True):
    time.sleep(5) # take schreenshot every 5 seconds
    # reading from frame
    ret, frame = cam.read()

    if ret:
        # if video is still left continue creating images
        name = './data/frame' + str(currentframe) + '.jpg'
        print('Creating...' + name)

        # writing the extracted images
        cv2.imwrite(name, frame)

        # increasing counter so that it will
        # show how many frames are created
        currentframe += 1
    else:
        break

# Release all space and windows once done
cam.release()
cv2.destroyAllWindows()