python读取所有图片名写入txt文件，并用opencv播放成视频

1. 读取目录下图片名

   import os
   import sys
   import argparse
   
   if __name__ == "__main__":
       parser = argparse.ArgumentParser(description="读取输入文件夹下的文件名, 写入txt文件")
       parser.add_argument('dirname', type = str, default = '')
       args = parser.parse_args()
       dirname = args.dirname
       if not os.path.exists(dirname):
           print("error: directory ", dirname, " not exits!")
           sys.exit()
       else:
           print("successful: directory ", dirname, " exist")
       file = open(dirname+"\\filenames.txt", "w")
       ## 读取文件夹dirname下的文件和子文件夹，并判断是文件还是文件夹
       names = os.listdir(dirname)
       for name in names:
           # path = os.path.join(dirname, name)  ##很有必要，不然结果会不对
           if name.split('.')[-1]=='png': ##png格式的图片才写入，可以改成jpg
               file.write("{0}\n".format(name))
       file.close()
   

2. 读取图片并播放

   import os
   import argparse
   import cv2
   
   if __name__ == "__main__":
       parser = argparse.ArgumentParser()
       #文件夹里有图片和写入图片名的txt文件
       parser.add_argument("dir_name")
       args = parser.parse_args()
       dir_name = args.dir_name
       image_files = []
       with open(dir_name + "\\filenames.txt", "r") as f:
           for line in f.readlines():
               line = line.strip('\n')
               image_files.append(line)
       N = len(image_files)
       cv2.namedWindow("image_video", cv2.WINDOW_AUTOSIZE)
       for i in image_files:
           image_file = os.path.join(dir_name, i)
           image = cv2.imread(image_file, cv2.IMREAD_UNCHANGED)
           cv2.imshow("image_video", image)
           ##帧率为1000/50 = 20 pfs
           key = cv2.waitKey(50)
           ##点击q或Esc退出
           if key & 0xFF == ord('q') or key == 27:
               cv2.destroyAllWindows()
               break