"""
Created on Thu Nov 15 09:38:32 2018

@author: baijun
"""
import os
import argparse,random
import cv2
from tqdm import tqdm

def parse_args():
    '''parse args'''
    parser = argparse.ArgumentParser()
    parser.add_argument('--input','-i', dest='input',help='video input path')
    parser.add_argument('--output','-o',dest='output',help='video output path')
    parser.add_argument('--num','-n',dest='numFramePerSecond',type=int,default=1,help='num frame to get per second')
    return parser.parse_args()

def main(args):
    list_video=os.listdir(args.input)
    if not os.path.exists(args.output):
        os.system('mkdir -p %s'%args.output)
    for video_name in tqdm(list_video):
        video_path=os.path.join(args.input,video_name)
        cap = cv2.VideoCapture(video_path)

        # FPS=int(cap.get(cv2.CAP_PROP_FPS))
        
        # random_index = random.sample(range(FPS), FPS)
        # indexFrame=random_index[:args.numFramePerSecond]
        
        ret=True
        count=1
        numOfImage=0
        while ret:
            ret,frame = cap.read()
            if ret == False:
                break
            count+=1
            if count % 30 == 0:
            #     count=0
            # if count in indexFrame:
            #     numOfImage+=1
                image_name="background_" + video_name+'_%06d'%count+'.jpg'
                image_path=os.path.join(args.output,image_name)
                cv2.imwrite(image_path,frame)
if __name__ == '__main__':
    args = parse_args()
    main(args)