关于vtt 与 srt 字幕 的相互转换

我在下载的udacity中教程时,字幕和视频是分离的,对于英文还无法完全听懂的我来说,字幕还是比较重要.不想看解释的可直接跳到最后复制代码运行即可.

查看了vtt和srt的区别,使用记事本打开vtt和srt,发现主要有两个

1. 首行多了 WEBVTT\n\n 标识符
2. 标点格式区别,vtt内部的"."在srt中为","

流程图:

基于python写了一个简单的脚本对其进行批量修改

• 1 引入依赖

1. 1. os获取文件信息
   2. sys获取命令行输入args
   3. re对获取的文件内容进行匹配或更换

import os
import sys
import re

• 2 定义主函数　

• if __name__ == '__main__':
      args = sys.argv
      print(args)
  
      if os.path.isdir(args[1]):
          file_list = get_file_name(args[1], ".vtt")
          for file in file_list:
              vtt2srt(file)
  
      elif os.path.isfile(args[1]):
          vtt2srt(args[1])
      else:
          print("arg[0] should be file name or dir")

• 3 定义获取文件名称函数get_file_name

• def get_file_name(dir, file_extension):
      f_list = os.listdir(dir)
  
      result_list = []
  
      for file_name in f_list:
          if os.path.splitext(file_name)[1] == file_extension:
              result_list.append(os.path.join(dir, file_name))
      return result_list

• 4 定义转换逻辑

• def vtt2srt(file_name):
      content = open(file_name, "r", encoding="utf-8").read()
      # 删除WEBVTT行
  
      content = re.sub("WEBVTT\n\n",'',content)
      # 替换“.”为“,”
      content = re.sub("(\d{2}:\d{2}:\d{2}).(\d{3})", lambda m: m.group(1) + ',' + m.group(2), content)
  
      output_file = os.path.splitext(file_name)[0] + '.srt'
      open(output_file, "w", encoding="utf-8").write(content)
  
  def srt2vtt(file_name):
      content = open(file_name, "r", encoding="utf-8").read()
      # 添加WEBVTT行
  
      content = "WEBVTT\n\n" + content
      # 替换“,”为“.”
      content = re.sub("(\d{2}:\d{2}:\d{2}),(\d{3})", lambda m: m.group(1) + '.' + m.group(2), content)
  
      output_file = os.path.splitext(file_name)[0] + '.vtt'
      open(output_file, "w", encoding="utf-8").write(content)

• 5 完整代码

• import os
  import sys
  import re
  
  def get_file_name(dir, file_extension):
      f_list = os.listdir(dir)
  
      result_list = []
  
      for file_name in f_list:
          if os.path.splitext(file_name)[1] == file_extension:
              result_list.append(os.path.join(dir, file_name))
      return result_list
  
  def vtt2srt(file_name):
      content = open(file_name, "r", encoding="utf-8").read()
      # 删除WEBVTT行
  
      content = re.sub("WEBVTT\n\n",'',content)
      # 替换“.”为“,”
      content = re.sub("(\d{2}:\d{2}:\d{2}).(\d{3})", lambda m: m.group(1) + ',' + m.group(2), content)
  
      output_file = os.path.splitext(file_name)[0] + '.srt'
      open(output_file, "w", encoding="utf-8").write(content)
  
  def srt2vtt(file_name):
      content = open(file_name, "r", encoding="utf-8").read()
      # 添加WEBVTT行
  
      content = "WEBVTT\n\n" + content
      # 替换“,”为“.”
      content = re.sub("(\d{2}:\d{2}:\d{2}),(\d{3})", lambda m: m.group(1) + '.' + m.group(2), content)
  
      output_file = os.path.splitext(file_name)[0] + '.vtt'
      open(output_file, "w", encoding="utf-8").write(content)
  
  if __name__ == '__main__':
      args = sys.argv
  
      if os.path.isdir(args[1]):
          file_list = get_file_name(args[1], ".vtt")
          for file in file_list:
              vtt2srt(file)
  
      elif os.path.isfile(args[1]):
          vtt2srt(args[1])
          print('done')
      else:
          print("arg[0] should be file name or dir")

  注意:

  • 1 为避免路径错误,请使用文件夹的绝对路径

  • 代码基于python3.x