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[MEDIA_PIPELINE_TF] minutes - 5 April 2012

From: Kazuyuki Ashimura <ashimura@w3.org>
Date: Fri, 06 Apr 2012 00:56:16 +0900
Message-ID: <4F7DC0A0.8090508@w3.org>
To: public-web-and-tv@w3.org
available at:

also as text below.

Thanks a lot for taking these minutes, Jan!



       [1] http://www.w3.org/

                                - DRAFT -

                 Media Pipeline Task Force Teleconference

05 Apr 2012



    See also: [3]IRC log

       [3] http://www.w3.org/2012/04/05-webtv-irc


           Kazuyuki_Ashimura, Giuseppe_Pascale, Clarke_Stevens,
           John_Simmons, Niklas_Schmücker, Bryan_Sullivan,
           Glenn_Adams, Joe_Steele, Aaron_Colwell,
           David_Corvoysier, Mark_Watson, Jan_Lindquist, Dave_Mays,
           Russell_Berkoff, Franck_Denoual, Paul_Gausman,
           Jason_Lewis, Kevin_Streeter, David_Mays,
           Juhani_Huttunen, SungOk_You, +1.425.269.aabb, ??P63,
           ??P25, +1.858.735.aagg, +1.360.367.aahh




      * [4]Topics
          1. [5]ABR proposal
          2. [6]Bugs
      * [7]Summary of Action Items

ABR proposal

    clarke states we will review what was not complete last week,
    open bugs and open issues in bugzilla

    if there is time discuss what the group wants to do

    going forward

    from last week what is left to do

    is to put the requirements into a real draft

    still open

    clarke to contact david singer to check if adaptive streaming
    is disadvantaged

    need some more time to give david more time to respond

    next item is discussion over requirment 10

    error reporting

    additional errors to feed back

    ads and splicing

    using another video element

    need for a use case to handle position timeframe

    <KevinStreeter> It should be possible to seamlessly splice
    content with a discontinuous timeline (such as advertising)
    into the presentation [this requirement may conflict with (2)?]

    this req may conflict with req 2

    continous timeline is required

    lets have some more discussion

    need a common time reference

    Aaron pointed out that use cases that are overlapping should be
    considered and timeshift

    need to be considered to properly support the use case

    need to keep a buffer to handle trickplay

    need a master timeline to insert ads into

    possibly need to adjust or map to the master timeline

    may need to expose a timestamp offsetting to the API

    2 is indep requirement

    it is fully addressed by the proposal

    11 is an additional requirement

    any thing else on the abr requirements?

    between here and next week clarke to add clarification before
    sending req to html5


    next subject is bugs

    <kaz> [8]Bugs section

       [8] http://www.w3.org/2011/webtv/wiki/MPTF#Bugs

    profile group has decided to use bugzilla to handle issues
    raised to the task force

    bug 13625

    <scribe> In process. Hixie needs to read provided materials.

    bug 12399

    <scribe> In process. Should this be generalized beyond video?
    Maybe start with video and consider a broader scope in any

    bug 13359

    <scribe> In process. Discussions on parameters and whether
    changes are necessary. "Must be human readable" requirement.

    bugs 13357 and 14492 have not been address since filed

    2 new bugs

    david: bugs came from discussions in profiling TF

    bug 16479


       [9] https://www.w3.org/Bugs/Public/show_bug.cgi?id=16479


      [10] https://www.w3.org/Bugs/Public/show_bug.cgi?id=16479

    bug relates not being able to piping multiple streams

    <joesteele> +q

    nothing is stated as to how resources are freed

    what webkit does the resource are not released when video tag
    is unloaded

    only when garbage collection actually removes the resources

    joe points that decryption resources are not released

    david: video decoder has been the main issue

    aeren: what is issue, if opening multiple videos

    some content depending on decryption may require hardware

    which is locked

    there are 2 errors, if there are policy concerns and there
    should be a warning if software is going to be used as fallback

    many audio tracks may be opened at the same time in order to
    give special effects which may confuse what should be handled

    david: when listening audio may be persisted

    when should resources be released

    javascript may remove tag from dom and reinsert it

    same media element may be used when transferring it

    david: may some use cases are required

    gius: add the use cases into the bug

    next bug


      [11] https://www.w3.org/Bugs/Public/show_bug.cgi?id=16480

    when needing to have broadcast channel where there is a mosaic
    of the channels

    may want an interface to select one of the channels

    need to draw borders in order to select channel or everything
    is done in javascript

    map element would be a much easier solution to be used but it
    is not available for the video element

    only images

    <bryan> is there anyway to use SVG as an scalable overlay
    frame, and trigger events from it?

    for each of the elements need to put the source to handle the
    multiple stream types

    <bryan> just a random idea

    wiht map you can associated anchors

    gius: investigate if there are better solutions

    bryan: there might be markup language like svg that can help in
    providing a solution

    giuseppe to explain how bugzilla to be used

    bugzilla to be used to collect issues

    and it is a better way to monitor questions and share with
    other groups

    it is a prefilter of the raised issues

    if agreed then it is pushed into the different WG's

    there is a template for filling out issues

    it is in the main wiki webpage



    use template to describe use case

    clarke: what could be useful to add the template to the mptf as
    a reference
    ... once the discussion is started it is necessary to highlight
    to clarke to be discussed
    ... person who filed bug has responsibility to highlight it
    ... general discussion
    ... in next couple of week finishup the requirements documents
    ... use time every week to discuss opened bugs
    ... soon to limit the number of phone conferences
    ... if any suggestions forward them to clarke as to how to

    move to phone conf every 2 weeks

    adhock would make it harder to plan attending

    <bryan> I like the building of the agenda on the wiki. It's
    easy to keep up as the topics for discussion are collected.

    clarke: plan to continue phone conf every week until req done

    joe to be scribe next week

    <bryan> That approach can help make the calls more adhoc but
    keep people engaged on the agenda as it builds.

    could use wiki agenda to identify critical mass of issues to be

    <kaz> [ adjourned ]

Summary of Action Items

    [End of minutes]

     Minutes formatted by David Booth's [13]scribe.perl version
     1.136 ( [14]CVS log)
     $Date: 2012/04/05 15:52:45 $

      [13] http://dev.w3.org/cvsweb/~checkout~/2002/scribe/scribedoc.htm
      [14] http://dev.w3.org/cvsweb/2002/scribe/
Received on Thursday, 5 April 2012 15:57:34 UTC

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