#!/usr/bin/env python
#-*- coding:utf-8 -*-
# @Time : 19-4-21 上午10:31
# @Author : chen

"""
VideoCapture()的使用
"""
import cv2
import argparse
import os
import pdb

ap = argparse.ArgumentParser()
ap.add_argument("-v", "--videoPath", default="./video_1.mp4", help="path to input video")
ap.add_argument("-o", "--outputPath", default="grabImages", help="path to output frames")

args = vars(ap.parse_args())

# 初始化,并讀取第一幀
# rval表示是否成功獲取幀
# frame是捕獲到的圖像
vc = cv2.VideoCapture(args["videoPath"])
rval, frame = vc.read()

# 獲取視頻fps
fps = vc.get(cv2.CAP_PROP_FPS)
# 獲取視頻總幀數(shù)
frame_all = vc.get(cv2.CAP_PROP_FRAME_COUNT)
print("[INFO] 視頻FPS: {}".format(fps))
print("[INFO] 視頻總幀數(shù): {}".format(frame_all))
print("[INFO] 視頻時長: {}s".format(frame_all/fps))

outputPath = os.path.sep.join([args["outputPath"]])
if os.path.exists(outputPath) is False:
 print("[INFO] 創(chuàng)建文件夾,用于保存提取的幀")
 os.mkdir(outputPath)

# 每隔100幀保存一張圖片
frame_interval = 100
# 統(tǒng)計當前幀
frame_count = 1
# 保存圖片個數(shù)
count = 0
while rval:
 rval, frame = vc.read()
 if frame_count % frame_interval == 0:
  filename = os.path.sep.join([outputPath, "test_{}.jpg".format(count)])
  cv2.imwrite(filename, frame)
  count += 1
  print("保存圖片:{}".format(filename))
 frame_count += 1

# 關(guān)閉視頻文件
vc.release()
print("[INFO] 總共保存：{}張圖片".format(count))