将单个视频转成图片

参数

• -i: 视频文件地址
• -o: 图片输出文件夹地址
• -f: 抽取帧数跨步

代码

核心就是cv2模块，先cv2.VideoCapture读取视频，然后通过cv对象的read()来获取每一个视频画面帧，进行进行存储等操作。

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import cv2
import os
import argparse
import glob
import time
from common import init_logger, output_log
import shutil

'''
将单个视频文件转换成图片
'''

ROOT_DIR = os.path.abspath(os.path.dirname(__file__))
FILE_NAME = os.path.basename(__file__)[:-3]


def make_parser():
    parser = argparse.ArgumentParser(description="将视频转换成图片")
    parser.add_argument("-i", "--input", dest="input_path", required=True, help="待转换的视频或者视频目录", type=str)
    parser.add_argument("-o", "--output", dest="output_dir", required=True, help="输出目录", type=str)
    parser.add_argument("-f", "--frequency", dest="frequency", help="抽取祯的频度, 例如：当指定为10时，则抽取第10、20、30祯，...，依次类推", default=10, type=int)
    return parser


def save_frames(video_file, output_path, frequency):
    start_ms = int(time.time() * 1000)
    video_name = os.path.basename(video_file)[:-4]

    output_dir = os.path.join(output_path, video_name)
    if os.path.exists(output_dir):
        shutil.rmtree(output_dir)
    os.makedirs(output_dir)

    cap = cv2.VideoCapture(video_file)
    index = 0
    while True:
        flag, frame = cap.read()
        if flag:
            index += 1
            if(index % frequency == 0):
                # frame = frame[:, 1304:]
                path = os.path.join(output_dir, "%s_%04d.jpg" % (video_name, index))
                output_log(path)
                cv2.imencode('.jpg', frame)[1].tofile(path)
        else:
            break
    cap.release()
    cv2.destroyAllWindows()
    end_ms = int(time.time() * 1000)
    output_log("save_frames %s finished in %d ms" % (video_file, end_ms - start_ms))


def video_2_image(video_file, output_dir, frequency):
    if video_file.lower().endswith((".mkv", ".mp4", ".avi", ".mov")):
        save_frames(video_file, output_dir, frequency)


def main():
    init_logger(os.path.join(ROOT_DIR, FILE_NAME + '.log'))

    parser = make_parser()
    args = vars(parser.parse_args())
    input_path = args["input_path"]
    output_dir = args["output_dir"]
    frequency = args["frequency"]

    output_log("input_path: %s" % input_path)
    output_log("output_dir: %s" % output_dir)
    output_log("frequency: %d" % frequency)

    if os.path.isdir(input_path):
        for p in sorted(glob.glob(input_path + "/*.*")):
            video_2_image(p, output_dir, frequency)
    elif os.path.isfile(input_path):
        video_2_image(input_path, output_dir, frequency)


if __name__ == '__main__':
    main()