TTML Simple Delivery Profile for Closed Captions (US) Note Published

The Timed Text Working Group has published a Group Note of TTML Simple Delivery Profile for Closed Captions (US). This document specifies the Simple Online Delivery Profile (US) of the Timed Text Markup Language (TTML). The primary goal of the profile is to establish a minimum level of interoperability between TTML 1.0 and legacy caption formats employed in US markets. This is accomplished by (1) defining a set of constraints that apply to TTML document instances that claim adherence to this profile, and (2) defining a set of mandatory features and behaviors that must be supported by implementations of a TTML Presentation Processor that claim adherence to this profile. Learn more about the Video in the Web Activity.