First Public Working Draft: IMSC Hypothetical Render Model

The Timed Text Working Group has published a First Public Working Draft of IMSC Hypothetical Render Model. This specification specifies an Hypothetical Render Model (HRM) that measures the complexity of caption and subtitle documents that conform to the IMSC Recommendation, so that they do not overload players. For more information, see the blog post Keeping the complexity of IMSC documents under control.