为了从视频中提取每一帧图片，编写Python脚本实现该功能
video_path为指定的视频路径
interval为指定分割视频是是否跳帧，默认不跳帧，即全部分割
width, height 为指定对分割帧图片调整大小，默认不调整
该脚本自动对帧图片编号，设置为7位编码，最多可分割9999999帧图片，即92小时的30FPS视频
# !/usr/bin/env python
# -*- coding: utf-8 -*-
# ============================================================
# @Date : 2021/12/08 14:40:31
# @Author : LiShan
# @Email : lishan@st.xatu.edu.com
# @File : extract.py
# @IDE : PyCharm
# @Func : Extract video image
# ============================================================
import os.path
import time
import cv2
video_path = "./assets/intersection.mp4"
idx1 = video_path.rfind('/')
idx2 = video_path.rfind('.')
save_path = "./assets/" + video_path[idx1+1:idx2]
if os.path.exists(save_path):
pass
else:
os.mkdir(save_path)
cap = cv2.VideoCapture(video_path)
fps = int(cap.get(cv2.CAP_PROP_FPS))
print('FPS:{:.2f}'.format(fps))
rate = cap.get(5)
frame_num = cap.get(7)
duration = frame_num/rate
print('video total time:{:.2f}s'.format(duration))
# width, height = 1920, 1080
cnt = 0
num = 0
# interval = int(fps) * 4
interval = 1
process_num = frame_num // interval
print('process frame:{:.0f}'.format(process_num))
t0 = time.time()
while cap.isOpened():
ret, frame = cap.read()
if ret:
cnt += 1
if cnt % interval == 0:
num += 1
# frame = cv.resize(frame, (width, height))
cv2.imwrite(save_path + "/%07d.jpg" % num, frame)
remain_frame = process_num - num
t1 = time.time() - t0
t0 = time.time()
print("Processing %07d.jpg, remain frame: %d, remain time: %.2fs" % (num, remain_frame, remain_frame * t1))
else:
break
if cv2.waitKey(1) & 0xff == 27:
break
cap.release()
cv2.destroyAllWindows()
print("done")
