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import cv2

import os

def extract_all_frames(video_path, output_dir="frames"):

# 创建输出目录

if not os.path.exists(output_dir):

os.makedirs(output_dir)

# 打开视频文件

cap = cv2.VideoCapture(video_path)

# 检查视频是否成功打开

if not cap.isOpened():

print("无法打开视频文件")

return

# 获取视频的帧率（FPS）和总帧数

fps = cap.get(cv2.CAP_PROP_FPS)

total_frames = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))

# 逐帧读取

frame_count = 0

while True:

success, frame = cap.read()

if not success:

break

# 计算当前帧的毫秒时间

ms_time = (frame_count / fps) * 1000

# 保存帧为图片

output_path = os.path.join(output_dir, f"frame_{frame_count:06d}_{int(ms_time)}ms.jpg")

cv2.imwrite(output_path, frame)

# 打印帧号和对应的毫秒时间

print(f"帧 {frame_count}: {ms_time:.2f}ms")

frame_count += 1

# 释放视频对象

cap.release()

print(f"提取完成，共 {frame_count} 帧")

# 示例调用

video_path = "example.mp4" # 替换为你的视频路径

extract_all_frames(video_path)