CCSUBS meet-up at NAB 2024

The ttconv open source converter now supports EBU STL input and WebVTT output. Convert CEA 608 captions to IMSC and WebVTT. Thanks Andreas Tai for the insights on STL and WebVTT. https://github.com/sandflow/ttconv/releases/tag/1.0.3 #imsc #subtitles #captioning #accessibility #webvtt