From Web and TV IG

Media Pipeline Task Force (MPTF)


The MPTF is a subset of the Web and TV Interest Group. The goal of the MPTF is to discuss requirements placed on the HTML5 video, audio and media interfaces by media formats that will be used for Web and TV. The MPTF will also propose APIs that meet these requirements.

Basic Information of the Task Force's work

  • End Date: Nov 2011
  • Confidentiality: Public
  • Moderator: Clarke Stevens - CableLabs
  • Meeting Schedule: Thursdays 15:00Z (details)


The goal of the MPTF is to propose HTML5 video and audio element extensions to support new media formats and commercial video provider service requirements. Potential areas are:

  • Script access to parameters controlling user agent adaptive bit rate algorithms.
  • User agent content splicing.
  • Browser handling of dynamic tracks in linear media streams of infinite length.
  • Enhancements to metadata track elements to support commercial video provider applications.
  • Other API changes that arise from use of media formats used by commercial video providers.

It is not considered within scope to specify HTML5 support for any particular adaptive bit rate format. Note the content protection for high-value content is not within scope of the MPTF even though it is acknowledged that there is likely overlap between MPTF scope and the area of content protection.

Success Criteria

We have succeeded if we can achieve consensus on requirements and a set of API concepts to be pursued within W3C.


The MPTF will do the following:

  • Refine the requirements and design goals at:
 @@@URL of MPTF Requirement Document@@@
  • Identity clear gaps in the Open Web platform, and categorize all the use cases/requirements into the following categories:
  1. Ignore
  2. It's resolved already
  3. Laision with others
  4. New requirements for existing Working Group
  5. Requires new working group
  6. We know it needs to go into a W3C working group we just don't know where
  7. We don't know where it goes and need more research
  • Propose WG charter(s) to W3C Director for recommendation track work fulfilling some (or all) of those requirements.


The MPTF should deliver the above listed deliverables by the end date mentioned in this charter (i.e. Nov 2011)

Detailed timeline is available below:

  • 3 months for the TF (that can be exceptionally extended up to 6 months on request from TF participants). At the end of this period, the TF should produce a report about the TF deliverables as described in this charter.
  • 1 month to present the result to the IG and reach consensus inside the IG


The MPTF will work with the following W3C groups and external groups...


This Task Force primarily conducts its technical work on the public mailing list at (archive).

TF emails should be labelled accordingly, by prefixing the email subject with the TF identifier "[MEDIA_PIPELINE_TF]". See W3C mailing list and archive usage guidelines.

There is also a member-only list to be used for administrative purposes at (archive).

The moderator maintains the Task Force page on the public Wiki, with the help of the Task Force participants if needed.


Participation in this Task Force's telephone conferences and f2f meetings is open to W3C Members and Invited Experts. However, all the public mailing list subscribers can participate in the Task Force discussion on the list.

To keep track of Task Force participation, all the participants should register his/her name and affiliation on the MPTF Participants Wiki page.


  1. If you have already sent an email to the public list, it would be appreciated if you could add your name/affiliation to the Task Force Wiki yourself. In this way we can confirm that the wiki is working as expected.
  2. In order to be a Task Force participant (and to edit the wiki yourself), you need to be an official IG participant, as explained at: