python/opencv 读取，写入和显示视频

最新推荐文章于 2025-06-17 17:02:00 发布

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最新推荐文章于 2025-06-17 17:02:00 发布

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本文介绍如何使用Python和OpenCV库读取、显示并处理视频文件。通过具体代码示例，展示了创建VideoCapture对象、检查摄像头或视频文件是否成功打开、逐帧读取和显示视频的方法。此外，还讲解了如何正确释放视频捕获对象和关闭所有窗口。

import cv2
import numpy as np

# Create a VideoCapture object and read from input file
# If the input is the camera, pass 0 instead of the video file name
cap = cv2.VideoCapture('chaplin.mp4')
#cap = cv2.VideoCapture(0)
# Check if camera opened successfully
if (cap.isOpened()== False): 
  print("Error opening video stream or file")

# Read until video is completed
while(cap.isOpened()):
  # Capture frame-by-frame
  ret, frame = cap.read()
  if ret == True:

    # Display the resulting frame
    cv2.imshow('Frame',frame)

    # Press Q on keyboard to  exit
    if cv2.waitKey(25) & 0xFF == ord('q'):
      break

  # Break the loop
  else: 
    break

# When everything done, release the video capture object
cap.release()

# Closes all the frames
cv2.destroyAllWindows()

learn opencv-使用OpenCV（C ++ / Python）读取，写入和显示视频