This is version 2.18 of the AWS Elemental Server documentation. This is the latest version. For prior versions, see the *Previous Versions* section of [AWS Elemental Conductor File and AWS Elemental Server Documentation](https://docs.aws.amazon.com/elemental-server/).

# Reference: Supported Captions Formats
<a name="supported-formats"></a>

The following lists show supported input and output captions types. The table at the end of this topic provides definitions for each of these captions types.

**Note**  
Support for an input format and support for an output format doesn't mean that AWS Elemental Server supports *conversion from* a particular input format to a particular output format. For that information, see the **Reference** tab of the documentation on the web interface of your appliance. To go to the documentation, choose the **Support** tab at the top of the interface.<a name="supported-caption-input"></a>

**Supported Input Caption Formats**
+ Ancillary data
+ ARIB
+ DVB-Sub
+ Embedded
+ Embedded\+SCTE-20
+ SCC
+ SCTE-20
+ SCTE-27
+ SMI
+ SRT
+ STL<a name="supported-caption-output"></a>

**Supported Output Caption Formats**
+ Ancillary\+Embedded
+ ARIB
+ Burn-in
+ CFF-TT
+ DVB-Sub
+ Embedded
+ Embedded\+SCTE-20
+ RTMP CaptionInfo
+ RTMP CuePoint
+ SCC
+ SCTE-20\+Embedded
+ SMI
+ SRT
+ Teletext
+ TTML
+ WebVTT


**Caption Format Descriptions**  

|  Caption  |  Description  | 
| --- | --- | 
| Ancillary data | From MXF input, data that is compliant with “SMPTE 291M: Ancillary Data Package and Space Formatting” and is contained in ancillary data.<br />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 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 below. | 
| ARIB | Captions that are compliant with the ARIB STD-B37 Version 2.4 | 
| Burn-in | It is technically impossible for the encoder to read burn-in captions. Therefore, from an input viewpoint, they cannot be considered to be captions.<br />Burn-in captions are captions that are converted into text and then overlaid on top of the picture directly in the video stream. | 
| CFF-TT | Captions for Ultraviolet output. | 
| DVB-Sub | Captions that are compliant with ETSI EN 300 743. | 
| 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. | 
| SRT | Captions in the SRT format. | 
| STL | Captions in the EBU STL format. Spruce STL format is not supported. | 
| Teletext | From TS input: Captions in the EBU Teletext format.<br />From MXF file input: Captions in the EBU Teletext format.<br />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” as defined by the W3C organization. |