利用Python怎么实现一个图像处理功能

import subprocess
import imageio
import os
from PIL import Image

def video2mp3(file_name):
 """
 将视频转为音频
 :param file_name: 传入视频文件的路径
 :return:
 """
 outfile_name = file_name.split('.')[0] + '.mp3'
 subprocess.call('ffmpeg -i ' + file_name
     + ' -f mp3 ' + outfile_name, shell=True)

def video_add_mp3(file_name, mp3_file):
 """
  视频添加音频
 :param file_name: 传入视频文件的路径
 :param mp3_file: 传入音频文件的路径
 :return:
 """
 outfile_name = file_name.split('.')[0] + '-txt.mp4'
 subprocess.call('ffmpeg -i ' + file_name
     + ' -i ' + mp3_file + ' -strict -2 -f mp4 '
     + outfile_name, shell=True)

def compose_gif(file_path):
 """
  将静态图片转为gif动图
  :param file_path: 传入图片的目录的路径
  :return:
 """
 img_paths = sorted([int(p[3:-4]) for p in os.listdir(file_path) if os.path.splitext(p)[1] == ".png"])
 img_paths = img_paths[:int(len(img_paths) / 3.6)]
 gif_images = []
 for path in img_paths:
  gif_images.append(imageio.imread('{0}/out{1}.png'.format(file_path, path)))
 imageio.mimsave("test.gif", gif_images, fps=30)

def compress_png(file_path):
 """
  将gif动图转为每张静态图片
  :param file_path: 传入gif文件的路径
  :return:
 """
 img_paths = [p for p in os.listdir(file_path) if os.path.splitext(p)[1] == ".png"]
 for filename in img_paths:
  with Image.open('{0}/{1}'.format(file_path, filename)) as im:
   width, height = im.size
   new_width = 150
   new_height = int(new_width * height * 1.0 / width)
   resized_im = im.resize((new_width, new_height))
   output_filename = filename
   resized_im.save('{0}/{1}'.format(file_path, output_filename))

if __name__ == '__main__':
 # video2mp3(file_name='data-a.mp4')
 video_add_mp3(file_name='swap-data-a.mp4', mp3_file='data-a.mp3')
 # compose_gif(file_path='merged')
 # compress_png(file_path='merged')