python视频与帧图片的相互转化,以及查看视频分辨率

1.拆分视频为帧图片

import cv2

def video2frame(videos_path,frames_save_path,time_interval):

    vidcap = cv2.VideoCapture(videos_path)

    success, image = vidcap.read()

    count = 0

    while success:

        success, image = vidcap.read()

    count = count + 1

    if count % time_interval == 0:

        cv2.imencode('.jpg', image)[1].tofile(frames_save_path + "frame%d.jpg" % count)

    print('一共{}张，选取其中{}张'.format(count,int(count/time_interval)))

if __name__ == '__main__':

    videos_path = 'C:\\Users\\cjk\\Desktop\\test.mp4' #视频的存放路径

    frames_save_path = 'C:\\Users\\cjk\\Desktop\\images\\' #视频切分成帧之后图片的保存路径

    time_interval = 5 #每5帧保存一次

    video2frame(videos_path, frames_save_path, time_interval)

2.用帧图片合成视频

import cv2

import os

import numpy as np

from PIL import Image

def frame2video(im_dir,video_dir,fps):

    im_list = os.listdir(im_dir)

    im_list.sort(key=lambda x: int(x.replace("frame","").split('.')[0]))

    img = Image.open(os.path.join(im_dir,im_list[0]))

    img_size = img.size #获得图片分辨率，im_dir文件夹下的图片分辨率需要一致

    fourcc = cv2.VideoWriter_fourcc(*'XVID')

    videoWriter = cv2.VideoWriter(video_dir, fourcc, fps, img_size)

    for i in im_list:

        im_name = os.path.join(im_dir+i)

        frame = cv2.imdecode(np.fromfile(im_name, dtype=np.uint8), -1)

        videoWriter.write(frame)

    videoWriter.release()

if __name__ == '__main__':

    im_dir = 'C:\\Users\\cjk\\Desktop\\images\\'#帧存放路径

    video_dir = 'C:\\Users\\cjk\\Desktop\\ok.avi' #合成视频存放的路径

    fps = 30 #帧率

    frame2video(im_dir, video_dir, fps)

3.查看视频分辨率

import os,time

import cv2

#获取文件夹中的文件名列表

def get_file_list(file_path):

    dir_list = os.listdir(file_path)

    if not dir_list:

        return

    else:

        dir_list = sorted(dir_list,key=lambda x: os.path.getmtime(os.path.join(file_path, x)))

        return dir_list

file_path = 'H:\视频\\'

dir_list = get_file_list(file_path)

#获取使用cv2获得视频的分辨率width和height。

def get_vedio_height_width(filename):

    cap = cv2.VideoCapture(filename)

    width = cap.get(cv2.CAP_PROP_FRAME_WIDTH )

    height = cap.get(cv2.CAP_PROP_FRAME_HEIGHT)

    #print(width,height)

    return width,height

if __name__ == '__main__':

    for dir in dir_list:

        width,height = get_vedio_height_width(file_path+dir)

        print('文件名:',dir)

        print('分辨率:',width,height)

python视频与帧图片的相互转化,以及查看视频分辨率的相关教程结束。