京东猪脸识别比赛数据预处理：用Python将视频每一帧提取存储为图片

#! encoding: UTF-8

import os

import cv2
import cv

videos_src_path='/sata_disk/E_office/zhouhongli/pig/train'
images_save_path='/sata_disk/E_office/zhouhongli/pig/frame'

videos = os.listdir(videos_src_path)
videos = filter(lambda x: x.endswith('mp4'), videos)

for each_video in videos:
    print each_video

    # get the name of each video, and make the directory to save frames
    each_video_name,_=each_video.split('.')
    os.mkdir(images_save_path +'/'+ each_video_name)

    each_video_save_full_path=os.path.join(images_save_path, each_video_name) + '/'

    # get the full path of each video, which will open the video tp extract frames
    each_video_full_path=os.path.join(videos_src_path, each_video)

    cap=cv2.VideoCapture(each_video_full_path)
    frame_count = 1
    success = True
    while(success):
        success, frame=cap.read()
        print 'Read a new frame: ', success

        params = []
        params.append(cv.CV_IMWRITE_PXM_BINARY)
        params.append(1)
        cv2.imwrite(each_video_save_full_path + each_video_name + "_%d.jpg" % frame_count, frame, params)

        frame_count = frame_count+1

cap.release()

zhouhongli@1080TI:~$ find  . -name '*_2952.jpg' -size 0 -print0 |xargs -0 rm