Main Page/Media Timed Events TF

From Web and TV IG

Media Timed Events Task Force


The Media Timed Events Task Force is part of the Media & Entertainment Interest Group. The Task Force is responsible for gathering use cases and deriving technical requirements for improved support for timed events related to audio or video media on the web, where synchronization to a playing audio or video media stream is needed.

The goal is to extend the existing support in HTML for text track cue events to add support for dynamic content replacement cues and generic metadata events that drive synchronized interactive media experiences, and improve the timing accuracy of rendering of web content intended to be synchronized with audio or video media playback. Of particular interest is support for event data carried in-band with the audio or video media, such as DASH emsg events and ID3 timed metadata.

Basic Information

  • Start Date: 30 April 2018
  • End Date: TBD
  • Confidentiality: Public
  • Initial Moderator(s): Giridhar Mandyam (Qualcomm)
  • Meeting Schedule: The 3rd Monday of each month at 4pm UK time

Success Criteria

We have succeeded if we can fulfil the following tasks:

  • Definition of scenarios and use cases
  • Definition of specific technical requirements
  • Identified gaps in the Web platform where technical requirements are not currently met
  • Proposed solutions to those gaps, e.g., by submitting proposals to the Web Platform Incubator Community Group (WICG)


The Media Timed Events Task Force will work with the following W3C groups and external groups.

W3C groups

  • Timed Text WG
  • Audio Description CG
  • Multi-device Timing CG

External groups


Conference calls

The TF holds teleconferences every two weeks as follows.

Date/Time: Every 3rd Monday of the month, at 15:00 UTC.

WebEx Service: TODO [WebEx Best Practice]

IRC chat:

  1. Go to:
  2. Pick your nickname

Meeting minutes

Task Force discussions are usually held during IG teleconferences and IG face-to-face meetings as well. The minutes of these meetings are available on the IG wiki top page.

All the minutes can also be retrieved from mailing-list archives.



Participation in this Task Force's telephone conferences and face-to-face meetings is open to W3C Members and Invited Experts. However, all public mailing list subscribers can participate in the Task Force discussion on the list.


  • Aim to conclude work by TPAC 2018