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Media timed events API for MPEG DASH MPD #122
Request for Mozilla Position on an Emerging Web Specification
Folks from the BBC are requesting feedback an API proposal. From WICG discourse thread:
There is a need in the media industry for an API to support metadata events synchronized to audio or video media, specifically for both out-of-band event streams and in-band discrete events (e.g., MPD -carriage and emsg events in MPEG DASH... These media timed events can be used to support use cases such as ad insertion or presentation of supplemental content alongside the audio or video.