# Identifying content in an SRT source
<a name="extract-contents-srt"></a>

The content in an SRT input is always a transport stream (TS). The TS is made up of one program (SPTS) or multiple programs (MPTS). Each program contains a combination of video, a combination of audio, and optional captions. 

Obtain identifying information from the content provider.


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[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/medialive/latest/ug/extract-contents-srt.html)