之前的帖子 https://www.52pojie.cn/forum.php?mod=viewthread&tid=1726138&page=1#pid45082722
新特点：
1、这次用的指定秒提取，免得解析每一帧，减少时间
2、可以输入的是文件夹地址，也可以是单个视频文件的地址
[Python] 纯文本查看 复制代码import cv2
import os
#图片截取
def get_frame_from_video(video_name, frame_time, img_dir, img_name):
"""
get a specific frame of a video by time in milliseconds
:param video_name: video name
:param frame_time: time of the desired frame
:param img_dir: path which use to store output image
:param img_name: name of output image
:return: None
"""
vidcap = cv2.VideoCapture(video_name)
# Current position of the video file in milliseconds.
vidcap.set(cv2.CAP_PROP_POS_MSEC, frame_time - 1)
# read(): Grabs, decodes and returns the next video frame
success, image = vidcap.read()
if not os.path.exists(img_dir):
os.makedirs(img_dir)
if success:
# save frame as JPEG file
#cv2.imwrite(img_dir + sep + img_name, image)
cv2.imencode('.jpg', image)[1].tofile(img_dir +'/'+ str(img_name)+'.jpg') ##正确方法
# cv2.imshow("frame%s" % frame_time, image)
# cv2.waitKey()
#得到相应的秒值列表
def qvmiaozhi(zongmiao,jiangemiao):
a=[]
miao = 1
while miao
