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Captions and subtitles are types of time-synchronized text that help your viewers to understand the audio components of your video content.


Screenshot of an English caption in a video

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Synchronized TextDescription
**Captions**A caption displays the text of the original audio and includes non-speech elements like noises.
**Subtitles**Used when the viewer has the ability to hear the content but does not understand the language of the video content A subtitle translates the text of the original audio into a different language. Non-speech elements are not captured.

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For simplicity, both captions and subtitles are referred to as captions in our documentation.

JWP supports the rendering of captions in the video display. A viewer can enable captions by clicking the CC icon.

When added to your video content, captions provide several benefits to you and your viewers.

Publishers / Broadcasters / CreatorsVIEWERS
• Increasing the discoverability of your content through video SEO • Adhering to legal requirements• Showing text explanations of audio • Increasing content retention • Enabling viewers to watch video content in quiet environments

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## Supported caption types

Captions can either be embedded in the video (embedded captions) or loaded from a separate file (side-loaded or sidecar captions). The web player supports both types of captions.

The following table lists common caption formats that are supported.

<table> <thead> <tr> <th> Format </th> <th> Type </th> <th> Description </th> </tr> </thead> <tbody> <tr> <td width="20%"><strong>CEA-608<br />CEA-708 </strong></td> <td width="17%">Embedded</td> <td width="63%">Used in videos that originally were on broadcast television <br /><br /> Captions are included as part of the video content. These captions are styled according to the device's captions and subtitle settings that the viewer sets. </td> </tr> <tr> <td><strong><a href="https://www.w3.org/TR/webvtt1/" target="_blank">WebVTT</a> (.vtt)</strong></td> <td>Embedded or Side-loaded</td> <td>Common format used for online video <br /><br /> Captions can be embedded as part of a live stream or can be side-loaded as a separate file. WebVTT captions can include the caption, a description, and metadata information.

  • A .vtt file should always be saved in UTF8 encoding to prevent character issues.

  • The body of the WebVTT file must contain the string WEBVTT in the header in order to be parsed correctly. Learn more about <a href="https://www.w3.org/TR/webvtt1/#file-structure" target="_blank">formatting a .vtt file</a>.

</td> </tr> <tr> <td><strong>SubRip Text (.srt)</strong></td> <td>Side-loaded</td> <td>Common format used for online video <br /><br /> SubRip Text captions only include the caption. Neither description nor metadata information can be included. </td> </tr> </tbody> </table>

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