从 YouTube 上下载下来的 vtt 字幕是为双行显示优化过的，如果使用 ffmpeg 等工具，将其转换成 srt 字幕，结果可能是这样：
1
00:00:00,030 --> 00:00:02,659
what up YouTube and welcome to my first
2
00:00:02,659 --> 00:00:02,669
what up YouTube and welcome to my first
3
00:00:02,669 --> 00:00:09,589
what up YouTube and welcome to my first
ever episode of Lindsay beginnings a lot
4
00:00:09,589 --> 00:00:09,599
ever episode of Lindsay beginnings a lot
5
00:00:09,599 --> 00:00:11,419
ever episode of Lindsay beginnings a lot
of people ask me how I am the way I am
放到字幕软件里，根本无法制作翻译。
所以需要将其转换为单行的 srt 字幕。这样的：
1
00:00:00,030 --> 00:00:02,659
what up YouTube and welcome to my first
2
00:00:02,669 --> 00:00:09,589
ever episode of Lindsay beginnings a lot
3
00:00:09,599 --> 00:00:11,419
of people ask me how I am the way I am
4
00:00:11,429 --> 00:00:13,430
talking out to this point how was this
5
00:00:13,440 --> 00:00:17,269
created good question what when I was a
6
00:00:17,279 --> 00:00:19,340
youngin in high school my dad had some
这个脚本就是这个功能。
在命令行界面，用 python 执行这个脚本，然后会提示你输入 vtt 文件路径，将 vtt 文件拖入，再回车，就会生成一个转换好的 srt 文件