Learn about captions
Captions and subtitles are types of time-synchronized text that help your viewers to understand the audio components of your video content.
|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.
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 / Creators||VIEWERS|
|• 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
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.
|CEA-608 / CEA-708||Embedded||Used in videos that originally were on broadcast television|
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.
|WebVTT (.vtt)||Embedded or|
|Common format used for online video|
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.
Your .vtt files should be saved using UTF8 encoding to prevent rendering issues.
|SubRip Text (.srt)||Side-loaded||Common format used for online video|
SubRip Text captions only include the caption. Neither description nor metadata information can be included.
Updated 3 months ago