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[MEDIA_PIPELINE_TF] minutes - 1 December 2011

From: Kazuyuki Ashimura <ashimura@w3.org>
Date: Thu, 08 Dec 2011 15:40:42 +0900
Message-ID: <4EE05BEA.9020509@w3.org>
To: public-web-and-tv@w3.org
sorry for the delay.

The minutes from the MPTF call on Dec. 1 are available at:
http://www.w3.org/2011/12/01-webtv-minutes.html

also as text below.

Thanks a lot for taking these minutes, Russell!

Kazuyuki

---
    [1]W3C

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

                                - DRAFT -

                     Media Pipeline Task Force call
                               1 Dec 2011

Attendees

    Present
           +1.720.934.aaaa, Joseph_Scheuhammer, +1.417.671.aabb, Canon,
           tedleung, Duncan, +1.425.888.aacc, Jan_Lindquist, glenn,
           Mark_Watson, +1.858.942.aadd, Mark_Vickers

    Regrets
           Kaz

    Chair
           Clarke

    Scribe
           R_Berkoff
      _________________________________________________________

    Clarke: Request to take notes - R-Berkoff
    ... Cover discussions on reflector about different errors
    ... Cover Mark W comments on errors
    ... Then Jan and Disney comments

    <glenn> Clarke, the TF's Telcoo page seems to have the wrong time
    listed ... 1500Z ... needs to be updated to winter time (1600Z)

    Clarke: Most errors about communications errors - Disney errors
    concerns authorization issues

    Jan: On Mark's comments - Generic syntax on error identification -
    May not make sense
    ... Combined with Mark's proposal
    ... Added DNS server errors

    Mark?: Why was categorization scheme dropped?

    Jan: Describes http error scheme?
    ... Added header for RTSP
    ... Added string identifier ex: Protocol:...

    Mark?: HTML5 might not accept scheme?

    Jan: Combined with Marks draft w/additions

    Mark: Will send comments on Jan's proposal

    Clarke: To Mark: Please explain proposal - Had 600 errors

    <glenn> note other error values in DOM, etc., are defined as
    enumerated integers, not strings

    Mark: HTML WG conservative on allocating errors

    Clarke: If Mark's proposal followed - 10 to 12 errors added to HTML
    media element

    Mark: 2nd level error - Network error - then what kind of error
    ... Also list errors like no route to host etc

    Jason: Does proposed list include DRM errors

    Mark: No .. DNS errors, etc

    Clarke: Disney error set related to DRM - highter level errors

    Disney: Separate out DRM errors from others

    Mark: Working on detailed proposal
    ... Separating Authentication/Auth from other errors

    Clarke: Where should line be drawn?

    Bob: Some DRM vendors should provide input - PC clients module
    bundled with player does DRM work
    ... If DRM / Content Providers dont like arch then proposal not
    useful

    Mark: Errors codes would not impact robustness of DRM

    Bob: If Web Content passes keys to video player - Q1 is this
    accurate Q2 How would this work in HTML environment

    Mark: DRM module on client communicates to Video Tag
    ... Back-end system doesnt need to know about DRM just Authorization

    ??: On key security - key typically not at risk - Uses Public Key
    encryption

    Bob: Request for key gets routed through JS (not acted upon in JS)

    Jan: Existing API
    ... --From OIPF

    Mark: OIPF API has methods we can use - but doesnt split components
    in arch

    Jan: Additional spec available - JS and Conent Protection

    Mark: Please forward specs

    Clarke: Please post spec - Compare with PlayReady implementation

    Mark: PlayReady being implemented in HbbTV

    ??: On OIPF - How could OIPF specs be transferred to W3C

    Jan: Need to establish liaison
    ... OMA to W3C
    ... Doubtful W3C will go into DRM arch

    Mark: Need to discuss DRM arch - Needs not to be black-box
    components
    ... Scope to key exchange

    Jan: Need W3C WG to create APIs?

    Clarke: Should encourage DRM providers to participate

    MS: MS can provide resources for DRM
    ... Need workflow - Based on OIPF or Hybrid - Would need to address
    liaison issues
    ... Propose interface acceptable to W3C. MS & other DRM providers
    agree to proposed arch
    ... AR to propose something for next call

    MarkV?: Eventually would need separate group
    ... Would need to deal w/IP issues for OIPF

    <glenn> W3C specs can normatively ref specs from other orgs that
    have different IPR policies than W3C

    Clarke: Next topic

    Duncan: How many streams in adaptive set

    Jason: Helpful to have multi-bitrate controls - would improve apps

    Duncan: Will send proposal for discussion

    ??: Check WhatWG webpage?

    Duncan: Doesnt cover adaptive streams sets
    ... DTG beginning to consider related ideas

    ??: Related to DASH proposals?

    Clarke: To Duncan: Please post to MPTF Wiki
    ... Last topic - 3rd categories

    1 - Error codes

    <Johnsim> sorry - "??" above is Johnsim

    2 Feedback for Adaptive streaming

    ??: Thx John

    Clarke: Other questions?

    Jason: MediaSource extension

    Clark Francois proposal - Proposal to generate media streams from JS

    ... From Chrome guys - Feed content from JS into video tag
    ... Concerns whether viable on constrained platforms

    Clarke: Concerns about interop

    Jason: Video Tag doesnt define codecs

    Jasons: For ex HTTP-Live Streaming - JS can feed content into video
    tag

    Jason: Similar to Mark's proposal to pass Key into Video Tag
    ... May have performance concerns (involving JS)

    Clarke: Encourage participants to evaluate proposal ... Cover in
    more detail when Francois is available
    ... End of agenda - will update holiday schedule

    End

Summary of Action Items

    [End of minutes]
      _________________________________________________________


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Received on Thursday, 8 December 2011 06:42:00 UTC

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