# Understanding Captions (Live)

## In brief

Goal
  Live videos have captions.
What to do
  Provide synchronized text for audio content in real-time videos.
Why it's important
  People who are deaf or hard of hearing can understand audio in real-time video content.

## Intent of Captions (Live)

The intent of this Success Criterion is to enable people who are deaf or hard of hearing to watch real-time presentations. Captions provide the part of the content available via the audio track. Captions not only include dialogue, but also identify who is speaking and notate sound effects and other significant audio.

This success criterion was intended to apply to broadcast of synchronized media and is not intended to require that two-way multimedia calls between two or more individuals through web apps must be captioned regardless of the needs of users. Responsibility for providing captions would fall to the content providers (the callers) or the “host” caller, and not the application.

## Benefits of Captions (Live)

- People who are deaf or have a hearing loss can access the auditory information in the synchronized media content through captions.

## Examples of Captions (Live)

A Web cast
  A news organization provides a live, captioned Web cast.
A music Web cast
  An orchestra provides Communication Access Realtime Translation (CART) captioning of each real-time Web performance. The CART service captures lyrics and dialog as well as identifies non-vocal music by title, movement, composer, and any information that will help the user comprehend the nature of the audio.

## Resources for Captions (Live)

- See 1.2.2: Captions (Prerecorded).

## Techniques for Captions (Live)

### Sufficient Techniques for Captions (Live)

- Creating captions for live synchronized media AND Providing open captions that are embedded directly in the video stream
- Creating captions for live synchronized media AND Providing closed captions using any readily available media format that has a video player that supports closed captioning

- Creating captions for live synchronized media AND Providing closed captions using one of the following techniques:

  - Providing captions through synchronized text streams in SMIL 1.0
  - Providing captions through synchronized text streams in SMIL 2.0

Captions may be generated using real-time text translation service.

### Additional Techniques (Advisory) for Captions (Live)

### Failures for Captions (Live)