EBU-TT Part 3 Carriage over WebSocket

EBU Tech 3370 S1

This document describes how EBU‑TT Live documents (EBU Tech 3370) can be carried from node to node using WebSocket connections.

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The EBU‑TT Part 3 specification (Tech 3370) defines the payload data for live subtitling applications, and the requirements for specifying carriage mechanisms for transferring live subtitle sequences between nodes.

This document defines one such carriage mechanism, based on the WebSocket protocol. This protocol provides a way to establish TCP socket connections over IP networks in a “web friendly” way that uses HTTP upgrades and has a TLS encryption mode.