Support for WebVTT captioning and subtitles

5 min read

Support for WebVTT captioning and subtitles

Those looking to add captions to their on-demand video content are in luck, as IBM Cloud Video has introduced support for WebVTT captioning on uploaded video assets. This empowers content owners to provide both captions and subtitles, in a multitude of languages, in conjuncture with their video content.

If WebVTT (Web Video Text Tracks) is an unfamiliar term, it stands for a caption format for displaying text tied to an HTML5 element, in this case video content. The actual WebVTT is written out in a format that includes timestamps followed by what text should be associated with each. While this can be created from a raw text file, there are a variety of programs and services which can assist in their creation as well.

Once generated, these caption files are then uploaded to the IBM Cloud Video service. They become associated with a particular video asset at this point, with the content owner designating a language for that particular track. After being uploaded, a manager on the account can unpublish them later or even download them, to make edits if they notice something is either incorrect or not timed properly.

After being enabled on a vid  eo, the end viewer can click a “CC” button to turn captions on. If multiple language tracks are available, they select which caption language they want to utilize. After making this selection, white text will appear toward the bottom of the video, surrounded by a partially transparent black line to improve visibility.

This content with captions can be enjoyed from a variety of formats, such as when shared on Twitter. It is also accessible on mobile devices, where content is transcoded to include multiple bitrates to be watched there.

Learn more about using WebVTT captioning for your video content.

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