AWS Elemental MediaLive
User Guide

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Captions Categories

Captions are grouped into five categories, based on how the captions are included in the output.

Captions Format

Category of This Format

ARIB

Object-style

Burn-in

Burn-in

DVB-Sub

Object-style

Embedded

Embedded

Embedded+SCTE-20

Embedded

RTMP CaptionInfo

Object-style

SCTE-20+Embedded

Embedded

SCTE-27 Object-style
SMPTE-TT Stream

Teletext

Object-style

TTML

Sidecar

Web-VTT

Sidecar

Embedded Captions

The captions are carried inside the video encode, which is itself in an output in the output group. There is only ever one captions entity within that video encode, although that entity might contain captions for up to four languages.

Object-style Captions

All the captions encodes for a given output group are in the same output as the corresponding video and audio.

Sidecar Captions

Each captions encode for a given output group is in its own "captions-only" output. The output group can contain more than one captions output, for example, one for each language.

Each captions-only output becomes a separate file in the packaged output.

Stream

Each captions encode for a given output group is in its own "captions-only" output. The output group can contain more than one captions output, for example, one for each language.

Each captions-only output becomes a separate stream in the packaged output.

Burn-in Captions

The captions are converted into text and then overlaid on the picture directly in the video encode. Strictly speaking, once the overlay occurs, these are not really captions because they are indistinguishable from the video.