Subtitle editor

In television, subtitles are used for "clarification, translation, services for the deaf, as well as identifying places or people in the news."

[1] Subtitles are frequently used to provide informative details regarding the action on screen, such as the names and titles of interview subjects,[2] a discussion topic change, to spell out web URLs or email addresses, to assist understanding speakers who mumble, details in instructional videos such as recipe ingredients, and humorous effects such as commentary or contradictory captions.

[4] Time is measured either in video frames, in milliseconds, or in hours:minutes:seconds.frames/milliseconds.

The exact format and separator characters(colon, period, comma, etc.)

A capable subtitle editor can convert one time measurement system into another without error.