# General information about supported captions formats
<a name="general-information-supported-formats"></a>

 The following table shows the formats that are supported in MediaLive. It 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 |  |  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 |  | Yes |  From input: It is technically impossible for the encoder to read burn-in captions. Therefore, from an input viewpoint, they can't 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.  | 
|  EBU-TT-D  |  | Yes |  Captions that are compliant with EBU Tech 3380, EBU-TT-D Subtitling Distribution Format, 2018.   | 
| Embedded | Yes | Yes |  In most containers: Captions that are compliant with the EIA-608 standard (also known as CEA-608 or *line 21 captions*) or the CEA-708 standard (also known as EIA-708). In a Link input container: Captions carried as ancillary captions that are compliant with SMPTE 334. The ancillary captions are compliant with EIA-608 standard (also known as CEA-608 or *line 21 captions*) or CEA-708 standard (also known as EIA-708).  | 
| Embedded\$1SCTE-20 | Yes | Yes |  Captions that have both embedded and SCTE-20 in the video. The embedded captions are inserted before the SCTE-20 captions.   | 
| RTMP CaptionInfo |  | Yes | Captions that are compliant with the Adobe onCaptionInfo format. | 
| 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\$1Embedded |  | Yes | Captions that are compliant with SCTE-43. The SCTE-20 captions are inserted in the video before the embedded captions. | 
| SCTE-27 | Yes |  | Captions that are compliant with the standard “SCTE-27 (2011), Subtitling Methods for Broadcast Cable.” | 
| SMPTE-TT |  | Yes | Captions that are compliant with the standard "SMPTE ST 2052-1:2010". | 
| Teletext  | Yes | Yes | From TS input: Captions in the EBU Teletext format.From a CDI input, a SMPTE2110 input, or in a Link container: Captions in OP47 teletext format, also known as SMPTE RDD-08 (compliant with ITU-R BT.1120-7). | 
| TTML |  | 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/](http://dev.w3.org/html5/webvtt/)). |