as easy as pie!
Step 1: Open the SRT subtitle file!
Add a WEBVTT header to the first line of the subtitle file!
WEBVTT
1
00:00:04,400 --> 00:00:06,000
字幕文本1
2
00:00:20,133 --> 00:00:23,800
字幕文本2the second step!
Replace the English comma [,] in the subtitles with an English period [.]!
WEBVTT
1
00:00:04.400 --> 00:00:06.000
字幕文本1
2
00:00:20.133 --> 00:00:23.800
字幕文本2the third step!
Save and Exit!
After exiting, simply change the subtitle file's extension to.vtt!
Super easy!