如何在Python OpenCV中保存视频

import cv2

# 定义保存视频的文件名、编解码器、帧率和分辨率
filename = 'output.avi'
fourcc = cv2.VideoWriter_fourcc(*'XVID')
fps = 30
frame_width = 640
frame_height = 480

# 创建VideoWriter对象
out = cv2.VideoWriter(filename, fourcc, fps, (frame_width, frame_height))

# 打开视频文件
cap = cv2.VideoCapture('input.mp4')

while cap.isOpened():
    # 读取视频帧
    ret, frame = cap.read()
    
    if ret:
        # 在窗口中显示帧
        cv2.imshow('Frame', frame)
        
        # 保存帧到视频文件
        out.write(frame)
        
        # 按下'q'键退出循环
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    else:
        break

# 释放资源
cap.release()
out.release()
cv2.destroyAllWindows()