如何在你的文件夹中使用opencv改变视频的速度后保存？

import cv2

video_path = '视频文件路径'
cap = cv2.VideoCapture(video_path)

output_path = '保存路径/保存文件名.mp4'
fourcc = cv2.VideoWriter_fourcc(*'mp4v')
fps = cap.get(cv2.CAP_PROP_FPS)
frame_width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
frame_height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
out = cv2.VideoWriter(output_path, fourcc, fps, (frame_width, frame_height))

speed_factor = 2  # 修改的速度因子，2表示加速两倍，0.5表示减速一半
while cap.isOpened():
    ret, frame = cap.read()
    if not ret:
        break
    
    # 修改视频速度
    modified_frame = cv2.resize(frame, None, fx=speed_factor, fy=speed_factor, interpolation=cv2.INTER_LINEAR)
    
    # 写入修改后的帧到输出视频文件
    out.write(modified_frame)
    
    # 显示修改后的帧
    cv2.imshow('Modified Video', modified_frame)
    
    # 按下 'q' 键退出循环
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
out.release()
cv2.destroyAllWindows()