# General information about supported captions formats
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 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.<br />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).<br />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\+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.  | 
| 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\+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 |  | 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” ([https://www.w3.org/TR/webvtt1/](https://www.w3.org/TR/webvtt1/)). |