python视频截图

本文主要是介绍python视频截图，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

一、目的

截取某一个文件夹的全部视频，生成对应视频的对应图片文件夹。

二、实现

1、截图实现

videoCapture = cv2.VideoCapture(videopath)
if videoCapture.isOpened():   
    rval, frame = videoCapture.read()
else:
    rval = False
    print("false")
while rval:
    rval, frame = videoCapture.read()
    i += 1
    if (i%timeF==0):
        j += 1
        pass

2、保存数据

def saveImage(frame, SaveAddress, num):
    try:
        address = SaveAddress + "/" + str(num) + '.jpg'
        cv2.imencode('.jpg', frame)[1].tofile(address)
        print(num)
    except Exception:
        print(address)

3、遍历截图

import cv2
import os

i = 0
j = 0
filepath = '视频文件夹'
pathDir = os.listdir(filepath)
save_filename = '保存截图文件夹'
timeF = 6 #截图时间间隔
class Nstr:
    def __init__(self, arg):
       self.x=arg
    def __sub__(self,other):
        c=self.x.replace(other.x,"")
        return c

def saveImage(frame, SaveAddress, num):
    try:
        address = SaveAddress + "/" + str(num) + '.jpg'
        cv2.imencode('.jpg', frame)[1].tofile(address)
        print(num)
    except Exception:
        print(address)

for allDir in pathDir:
    videopath = filepath + '/' + allDir
    name = videopath.split("/")[1]
    if name[-4:] == ".mp4":
        new_name = Nstr(name) - Nstr(name[-4:])
        save_file = os.path.join(save_filename, new_name)
        if not os.path.exists(save_file):
            os.mkdir(save_file)
        videoCapture = cv2.VideoCapture(videopath)
        if videoCapture.isOpened():  # 判断是否正常打开
            rval, frame = videoCapture.read()
        else:
            rval = False
            print("false")
        while rval:
            rval, frame = videoCapture.read()
            i += 1
            if (i%timeF==0):
                j += 1
                saveImage(frame, save_file, j)
                pass

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