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\$1SCTE-20
+ SCC
+ SCTE-20
+ SCTE-27
+ SMI
+ SRT
+ STL<a name="supported-caption-output"></a>

**Supported Output Caption Formats**
+ Ancillary\$1Embedded
+ ARIB
+ Burn-in
+ CFF-TT
+ DVB-Sub
+ Embedded
+ Embedded\$1SCTE-20
+ RTMP CaptionInfo
+ RTMP CuePoint
+ SCC
+ SCTE-20\$1Embedded
+ 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. 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\$1Embedded  | 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. 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\$1SCTE-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\$1Embedded  |  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. From MXF file input: Captions in the EBU Teletext format. 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.  |