How do I create or edit a closed captions file?

Written by Stuart Auld

Last published at: June 25th, 2020

If you wish to create or edit your own closed captions file, you can do so using a text editor such as Notepad++ or VS Code. Note: word processing software such as MS Word is not suitable for creating caption files.

Viostream supports captions formatted in accordance with the WebVTT standard. A WebVTT file in general consists of a sequence of text segments associated with a time-interval, called a cue.

A sample WebVTT file is shown below. Each cue consists of a start time, a finish time and the text to display


00:00.000 --> 00:03.000
This is the first caption

00:03.000 --> 00:08.000
Captions can be

00:08.000 --> 00:15.000
However, the player will automatically insert line-breaks where required, therefore manual line breaks are not recommended

Be sure to save your files with a .vtt extension so that you can upload them to Viostream.