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AWS Elemental MediaLive
User Guide

Supported Formats

The following table shows the supported formats, specifies whether they are supported in inputs or outputs, and specifies the standard that defines each format.

Caption Supported in Input Supported in Output Description
Ancillary data Yes From MXF input, data that is compliant with “SMPTE 291M: Ancillary Data Package and Space Formatting” and that is contained in ancillary data.
ARIB Yes Yes Captions that are compliant with ARIB STD-B37 Version 2.4.
Burn-in N/A Yes From input: It is technically impossible for the encoder to read burn-in captions. Therefore, from an input viewpoint, they cannot be considered to be captions.

For output: Burn-in captions are captions that are converted into text and then overlaid on top of the picture directly in the video stream.

DVB-Sub Yes Yes Captions that are compliant with ETSI EN 300 743.
Embedded Yes Yes Captions that are compliant with the EIA-608 standard (also known as CEA-608 or SMPTE-259M or “line 21 captions”) or the CEA-708 standard (also known as EIA-708).
Embedded+SCTE-20 Yes Yes Captions that have both embedded and SCTE-20 in the video. The embedded captions are inserted before the SCTE-20 captions.
SCTE-20 Yes Captions that are compliant with the standard “SCTE 20 2012 Methods for Carriage of CEA-608 Closed Captions and Non-Real Time Sampled Video.”
SCTE-20+Embedded Yes Captions that are compliant with SCTE-43. The SCTE-20 captions are inserted in the video before the embedded captions.
SCTE-27 Yes Yes Captions that are compliant with the standard “SCTE-27 (2011), Subtitling Methods for Broadcast Cable.”
Teletext Yes Yes From TS input: Captions in the EBU Teletext format.
TTML Yes Yes Captions files that are compliant with the standard “Timed Text Markup Language 1 (TTML1) (Second Edition).”
WebVTT Yes Captions that are compliant with “webvtt: The Web Video Text Tracks Format” (http://dev.w3.org/html5/webvtt/).