如何使用opencv计算视频(带处理)的fps

import cv2

def calculate_fps(video_path):
    # 打开视频文件
    cap = cv2.VideoCapture(video_path)

    # 获取视频帧数和帧率
    total_frames = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))
    fps = cap.get(cv2.CAP_PROP_FPS)

    # 初始化计时器
    prev_tick = cv2.getTickCount()

    while cap.isOpened():
        # 读取视频帧
        ret, frame = cap.read()

        if ret:
            # 显示视频帧
            cv2.imshow('Video', frame)

            # 计算帧率
            current_tick = cv2.getTickCount()
            fps = cv2.getTickFrequency() / (current_tick - prev_tick)
            prev_tick = current_tick

            # 显示帧率信息
            cv2.putText(frame, f"FPS: {int(fps)}", (10, 30), cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 255, 0), 2)
            cv2.imshow('Video', 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()
    cv2.destroyAllWindows()

# 调用函数计算视频帧率
calculate_fps('video.mp4')