Supported caption formats - AWS Elemental Live

Supported caption formats

Caption Supported in input Supported in output Description
Ancillary data √

  • From MXF input, data that is compliant with “SMPTE 291M: Ancillary Data Package and Space Formatting” and that is contained in ancillary data.

  • From QuickTime input or for QuickTime output, data that is compliant with EIA-608 (also known as CEA-608) or CEA-708 (also known as EIA-708) and that is contained in ancillary data.
Ancillary+Embedded √ For QuickTime output only, the output combines captions in ancillary data and embedded captions. The ancillary captions are compliant with EIA-608 (also known as CEA-608) or CEA-708 (also known as EIA-708). The embedded captions are described later in this table.
ARIB √ √ Captions that are compliant with the ARIB STD-B37 Version 2.4.
Burn-in N/A √

From input: It is technically impossible for Elemental Live 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 √ √ Captions that are compliant with ETSI EN 300 743.
EBU-TT-D √

Captions that are compliant with EBU Tech 3380, EBU-TT-D Subtitling Distribution Format, 2018.
Embedded √ √ 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 √ √ Captions that have both embedded and SCTE-20 in the video. The embedded captions are inserted before the SCTE-20 captions.
RTMP CaptionInfo √ Captions that are compliant with the Adobe onCaptionInfo format.
RTMP CuePoint √ Captions that are in the cuePoint format.
SCC √ √ Captions that are in the Scenarist format, file extension .scc.
SCTE-20 √ 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 √ Captions that are compliant with SCTE-43. The SCTE-20 captions are inserted in the video before the Embedded captions.
SCTE-27 √ Captions that are compliant with the standard “SCTE-27 (2011), Subtitling Methods for Broadcast Cable.”
SMI √ √ Captions in the Microsoft SAMI format.
SMPTE-TT √ Captions that are compliant with the standard “SMPTE ST 2052-1:2010.”
SRT √ √ Captions in the SRT format.
STL √ Captions in the EBU STL format. Spruce STL format is not supported.
Teletext √ √

From SDI input. Captions in:

  • OP42 teletext format. SMPTE 2031 field is unchecked in source.

  • OP47 teletext format wrapped in a SMPTE-2031 envelope. SMPTE 2031 field is checked in source.

  • OP47 teletext format, also known as SMPTE RDD-08 (compliant with ITU-R BT.1120-7). SMPTE 2031 field is unchecked in source.

From TS input: Captions in the EBU Teletext format.

From MXF file input: OP47 teletext format, also known as SMPTE RDD-08 (compliant with ITU-R BT.1120-7). SMPTE 2031 field is unchecked in source.

For output: Captions in the EBU Teletext format.
TTML √ √ Caption files that are compliant with the standard “Timed Text Markup Language 1 (TTML1) (Second Edition).”
WebVTT √ Captions that are compliant with “webvtt: The Web Video Text Tracks Format” (http://dev.w3.org/html5/webvtt/).