Supported source captions and output captions in a captions-only output container

This table describes the caption formats that can be included on their own in an output. With this option, the container is always a raw container that contains only the captions (video would be in another container that may be a raw container or may be some other type).

If you have one of the source caption formats listed in the first column – regardless of the source container – you can convert it to an external captions file and include it in a raw container that contains only that captions file.

Source input container	Source caption format	Supported output captions
Any container	SRT	SMI, SMPTE-TT, SRT, TTML, EBU-TT-D, Web-VTT
	SMI	SMI, SMPTE-TT, SRT, TTML, EBU-TT-D, Web-VTT
	TTML	SMI, SMPTE-TT, SRT, TTML, EBU-TT-D, Web-VTT
	SMPTE-TT	SMI, SMPTE-TT, SRT, TTML, EBU-TT-D, Web-VTT
	STL	SMI, SMPTE-TT, SRT, TTML, EBU-TT-D, Web-VTT
	Embedded	SCC, SMI, SMPTE-TT, SRT, TTML, EBU-TT-D, Web-VTT
	SCC	SCC, SMI, SMPTE-TT, SRT, TTML, EBU-TT-D, Web-VTT
	SCTE-20	SCC, SMI, SMPTE-TT, SRT, TTML, EBU-TT-D, Web-VTT
	SCTE-20+Embedded	SCC, SMI, SMPTE-TT, SRT, TTML, EBU-TT-D, Web-VTT
	Embedded+SCTE-20	SCC, SMI, SMPTE-TT, SRT, TTML, EBU-TT-D, Web-VTT
	Ancillary Data	SCC, SMI, SMPTE-TT, SRT, TTML, EBU-TT-D, Web-VTT
	Teletext	SMI, SMPTE-TT, SRT, TTML, EBU-TT-D, Web-VTT
	DVBSub	SMPTE-TT
	SCTE-27	SMPTE-TT