HTML Media Task Force Teleconference -- 25 Jun 2013

<trackbot> Date: 25 June 2013

<paulc> Agenda: http://lists.w3.org/Archives/Public/public-html-media/2013Jun/0027.html

<scribe> ScribeNick: adrianba

<scribe> Scribe: Adrian Bateman

Roll call, introductions and selection of scribe

paulc: done

Previous meeting minutes

<paulc> http://www.w3.org/2013/06/11-html-media-minutes.html

paulc: used these minutes to generate the agenda

Review of action items and issues

paulc: none for MSE

MSE status and bugs

<paulc> Latest Editor's draft: http://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html

paulc: spec hadn't been updated yesterday

<paulc> Current bug list: http://tinyurl.com/6pdnzej

adrianba: aaron had added PRE_LAST_CALL to the whiteboard field

<acolwell> PRE_LAST_CALL

adrianba: for all the bugs that are pre-last call
... so the new bugs (about half) are last call comments

paulc: there are 7 pre last call bugs < 22148

<paulc> See http://tinyurl.com/q3do7nx

paulc: are you suggesting prioritising these?

adrianba: yes

<paulc> https://www.w3.org/Bugs/Public/show_bug.cgi?id=22148#c3

Bug 22148 - Request that we reconsider adding jitter to video quality metrics

acolwell: i need to look at it some more but fine adding it for now
... not clear how this improves things but fine making the change
... i'll update the text

paulc: for comment 3

Bug 22137 - changes in number of audio tracks during advert insertion

<paulc> Bug 22137 - changes in number of audio tracks during advert insertion

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22137

adrianba: jerry might have some questions on this

jdsmith: not clear the proposal makes switching deterministic and simple

acolwell: the idea is that if there is a default track indicate in the init segment
... then you just pick the first default track for each type
... first default video or first default audio
... if there is no default indicated then you pick the first
... which tends to be the lowest track id but not always

jdsmith: will this be a good consistent experience

acolwell: i don't know - was a proposal to address the concern without adding too much complexity
... not clear what multi-track content is like

<paulc> Proposal is in https://www.w3.org/Bugs/Public/show_bug.cgi?id=22137#c3

jdsmith: need to do more research on content to see how this works
... sounds like it would be deterministic but want to make sure it is sensible

BobLund: consistent with MPEG2TS defines the lowest number first in the metadata (since there is no way to signal default)

<scribe> ACTION: jdsmith to review bug 22137 and provide feedback [recorded in http://www.w3.org/2013/06/25-html-media-minutes.html#action01]

<trackbot> Error finding 'jdsmith'. You can review and register nicknames at <http://www.w3.org/html/wg/media/track/users>.

<scribe> ACTION: adrianba to work with Jerry to review bug 22137 and provide feedback [recorded in http://www.w3.org/2013/06/25-html-media-minutes.html#action02]

<trackbot> Created ACTION-21 - Work with Jerry to review bug 22137 and provide feedback [on Adrian Bateman - due 2013-07-02].

Bug 22136 - Inband Storage for SPS/PPS in ISO BMFF

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22136

ACTION adrianba to work with jerry to confirm the proposal in 22136 is acceptable

<trackbot> Created ACTION-22 - Work with jerry to confirm the proposal in 22136 is acceptable [on Adrian Bateman - due 2013-07-02].

Bug 22135 - Changing Source Buffers

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22135

paulc: now resolved

Bug 22134 - When do multiple SourceBuffers have to be used

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22134

acolwell: think need to go through an be more explicit - need to go back and make more clear

ACTION acolwell to update spec for bug 22134 by the next call

<trackbot> Created ACTION-23 - Update spec for bug 22134 by the next call [on Aaron Colwell - due 2013-07-02].

Bug 22117 - Add a conformance section

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22117

paulc: Cyril says that he needs a little more time

acolwell: and i assigned the bug to him

<scribe> ACTION: Cyril to propose text for 22117 [recorded in http://www.w3.org/2013/06/25-html-media-minutes.html#action03]

<trackbot> Error finding 'Cyril'. You can review and register nicknames at <http://www.w3.org/html/wg/media/track/users>.

Bug 22112 - Merge appendBuffer and appendStream text

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22112

adrianba: haven't got to this yet - bug is assigned to me

Bug 22110 - Javascript decoding data

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22110

adrianba: fixed this morning

Bug 22109 - Use of the word sequence

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22109

acolwell: just need to sit down and think about again - didn't get to it

Bug 21431 - Specify splicing behavior for text tracks

https://www.w3.org/Bugs/Public/show_bug.cgi?id=21431

paulc: glenn responded and bug is marked resolved, fixed
... we have 7 outstanding bugs and we know who is responsible for each of them: jerry, adrian, aaron, and cyril
... once we have those fixed we will do CfC in TF to go to LC
... suggest we use the rest of the time for the post pre-LC bugs

Bug 22432 - Allow SourceBuffer.appendBuffer to take ownership of the ArrayBuffer

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22432

acolwell: think this is from somebody at mozilla
... think i agree with this - so we don't have to do the copy

<paulc> Suggestion: add wording similar to that added to Web Audio's decodeAudioBuffer method: https://dvcs.w3.org/hg/audio/rev/ef43ae5230bf

acolwell: are there other apis that do this?

adrianba: in two minds about this: on the one hand this seems like a solution to a problem that often happens with arraybuffers
... but on the other it's probably not something we're going to do soon
... up to now we've assumed that changing the buffer while an operation is happening is undefined
... and we might leave it that way so the spec reflects reality

acolwell: okay, not sure if they will object to a resolution that the spec doesn't imply copying

paulc: adrianba, should you respond to the bug?

Bug 22431 - HTMLVideoElement.videoPlaybackQuality should be a live object rather than returning a new object

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22431

acolwell: this is the discussion we had before about attribute vs. method
... i responded in the bug
... i don't feel strongly

paulc: maybe that will provoke a response in the bug

Bug 22430 - Handling multiple media element attachments

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22430

acolwell: believe we cover this case and it will probably be WONTFIX or WORKSFORME

Bug 22401 - [MSE]

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22401

acolwell: assigned to myself - editorial one word change

Bug 22371 - [MSE] Ogg byte streams

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22371

acolwell: will start by saying a little biased against ogg but will try to be fair
... not sure if want to add another format to the spec
... but each format has a constituency
... wonder if now is a good time to specify a mechanism for other formats
... so that we don't keep getting more and more added
... what do we want to do to stop bugs for everyone's favourite format

paulc: there is a proposal in the bug too

acolwell: yes, i have comments on the text too

pal: is there any reason why additional formats couldn't be done in separate documents as long as MSE specifies what needs to be included

acolwell: that's the point i think we're getting to
... we included formats originally to show how to support MSE
... but this won't scale
... otherwise new formats will constantly block MSE getting done

paulc: acolwell, you were talking about responding - was that about specific things

acolwell: there are some specific things about the proposal
... but the other task is maybe to define what a bytestream format spec looks like
... so we can provide a different place to put this than in the main spec

paulc: could be an annexe in the MSE doc that says if you want to define a new format here is what you must and should do

acolwell: think we have the start of that in the first part of this section
... we just don't say how you specify this

Bug 22329 - [MSE] TextTrack attributes settable in conflict with the html spec

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22329

<paulc> Aaron's response is in https://www.w3.org/Bugs/Public/show_bug.cgi?id=22329#c1

acolwell: i responded a while ago saying this is intentional because we're extending for supporting DASH

paulc: suggest resolving WONTFIX - person can reopen if they don't like the disposition
... we've gone through all the bugs

Any other business

paulc: any other business?
... lots of actions assigned

Adjournment

paulc: adjourned

- DRAFT -

HTML Media Task Force Teleconference

25 Jun 2013

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