File Extension: .srt
The SRT format is one of the most popular file formats for subtitles. They are plain text files with the subtitle data written in this format:
[subtitle number]
[start time as HH:MM:SS,mmm] --> [end time as HH:MM:SS,mmm]
[subtitle text]
For example:
69
00:07:02,871 --> 00:07:08,470
We set sail on this new sea because
there is new knowledge to be gained
70
00:07:08,470 --> 00:07:15,771
and new rights to be won, and they must
be won and used for the progress of all people.
71
00:07:15,819 --> 00:07:22,050
For space science, like nuclear
science and all technology
In SRT files, time values are represented in milliseconds, not frames. They represent video run time, not camera SMPTE timecode.
HH:MM:SS,mmm corresponds to the digits for hours, minutes, seconds, and milliseconds, respectively.