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=== EBU-TT ===
The [[European Broadcasting Union]] (EBU) defined several related profiles. EBU-TT Part 1 (Tech3350) uses a subset of [https://www.w3.org/TR/ttml1/ TTML1] constraining the features to make it more suitable for archive, exchange and use with broadcast video and web video applications.<ref>{{cite web | url=https://tech.ebu.ch/publications/tech3350 |title=Part 1: EBU-TT Part 1 - Subtitle format definition (EBU Tech 3350) |date=24 May 2017}}</ref> EBU-TT Part 3 (Tech3370) extends and constrains Part 1 further, in particular adding functionality to support live streaming of subtitles from the subtitle author to a distribution encoder.<ref>{{cite web | url=https://tech.ebu.ch/publications/tech3370 |title=Part 1: EBU-TT Part 3 Live Subtitling (EBU Tech 3370) |date=24 May 2017}}</ref> EBU-TT-D (Tech3380) is highly constrained profile of TTML1 intended specifically for distribution to players, and has been adopted by HbbTV, DVB and Freeview Play for example.<ref>{{cite web | url=https://tech.ebu.ch/publications/tech3380 |title=EBU-TT-D Subtitling Distribution Format (Tech3380) |date=22 May 2018}}</ref>
=== IMSC ===
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