{minutes} HTML WG media telecon 2015-06-30 - Action items, MSE bug status and MSE CR test suite

See http://www.w3.org/2015/06/30-html-media-minutes.html and below.

/paulc

Paul Cotton, Microsoft Canada
17 Eleanor Drive, Ottawa, Ontario K2E 6A3
Tel: (425) 705-9596 Fax: (425) 936-7329


[W3C]<http://www.w3.org/>

- DRAFT -
HTML Media Task Force Teleconference
30 Jun 2015

Agenda<https://lists.w3.org/Archives/Public/public-html-media/2015Jun/0046.html>

See also: IRC log<http://www.w3.org/2015/06/30-html-media-irc>

Attendees
Present
paulc, MattWolenetz, davide, jdsmith
Regrets
Chair
paulc
Scribe
paulc
Contents

  *   Topics<http://www.w3.org/2015/06/30-html-media-minutes.html#agenda>
     *   MSE action items<http://www.w3.org/2015/06/30-html-media-minutes.html#item01>
     *   MSE testing update<http://www.w3.org/2015/06/30-html-media-minutes.html#item02>
     *   MSE Bug 28822<http://www.w3.org/2015/06/30-html-media-minutes.html#item03>
     *   MSE Bug 28857<http://www.w3.org/2015/06/30-html-media-minutes.html#item04>
     *   Range removal algorithm<http://www.w3.org/2015/06/30-html-media-minutes.html#item05>
     *   Next meeting<http://www.w3.org/2015/06/30-html-media-minutes.html#item06>
  *   Summary of Action Items<http://www.w3.org/2015/06/30-html-media-minutes.html#ActionSummary>

________________________________

<trackbot> Date: 30 June 2015

<scribe> Agenda: https://lists.w3.org/Archives/Public/public-html-media/2015Jun/0046.html

Scribnick: paulc

test

Zakimk, who is present?

<scribe> Agenda: https://lists.w3.org/Archives/Public/public-html-media/2015Jun/0046.html
MSE action items

ACTION-95?

<trackbot> ACTION-95 -- Paul Cotton to Try to get some to update the firefox results -- due 2015-06-23 -- OPEN

<trackbot> http://www.w3.org/html/wg/media/track/actions/95

See http://w3c.github.io/test-results/media-source/all.html

Matt added these results

Close ACTION-95

<trackbot> Closed ACTION-95.

ACTION-96

<trackbot> ACTION-96 -- Jerry Smith to Update microsoft mse test results -- due 2015-06-23 -- OPEN

<trackbot> http://www.w3.org/html/wg/media/track/actions/96

Matt: I added the Spartan results. Jerry please check these.
... I wonder what the priority of MSE prioritzation within MSFT?
... Previously Jerry said he was working "heads down" on EME.

Jerry: Just started to looks at MSE results

Matt: Please let me know if you want any assistance or have questions

close ACTION-96

<trackbot> Closed ACTION-96.

ACTION-97?

<trackbot> ACTION-97 -- Paul Cotton to Contact apple about safari support and if they are interested in mse testing -- due 2015-06-23 -- OPEN

<trackbot> http://www.w3.org/html/wg/media/track/actions/97

Mike Smith added Safari results in http://w3c.github.io/test-results/media-source/all.html

Matt: Mike may have updated the Firefox results as well and lost a Chrome set of results
... Lots of time outs for Safari - could be a test runner problem, or a special flag is needed

Close ACTION-97

<trackbot> Closed ACTION-97.
MSE testing update

Update from Matt: https://lists.w3.org/Archives/Public/public-html-media/2015Jun/0040.html

Matt: I have been asking about the WebIDL possible problems

[Chromium] MSE w3c web-platform-tests interface.html shows multiple unexpected failures: https://code.google.com/p/chromium/issues/detail?id=504170

paulc: Matt's work has been concentrated on generates "columns" of results for different MSE implementations.
... Has anyone thought about whether we have ther right number of "rows" ie the right number or coverage of tests?

Matt: Mozilla is active in changing and adding tests
... I want to post up some new Chromium tests as well
... there are likely some coverage tests
... The Mozilla new tests are being done as Pull Requests by ms2ger and jgraham
... I will be working on fixing bad cells and adding coverage as we go forward

Jun 29 test results including Safari results: http://w3c.github.io/test-results/media-source/all.html
MSE Bug 28822

https://www.w3.org/Bugs/Public/show_bug.cgi?id=28822

MSE] Spec is ambiguous as to event behavior of an explicit MediaSource duration of +Infinity

"By my reading, the specs are currently ambiguous as to what happens when the MediaSource.duration gets set to +Infinity. Do we fire durationchange or not?"

Matt: Should we allow changing the Duration from +infinity to something else?
... The spec only sets +Infinity when we extract it from the in band media ie if there is no value there
... The bug contains a good question
... Does it make sense to change a finite duration to +Infinity?

Jerry: When would this occur ie going from a fixed duration to an unknown duration?

Matt: Inifinity is used for an unbounded stream

<MattWolenetz> http://www.w3.org/TR/html5/embedded-content-0.html#durationChange

The quoted text in the bug is from Step 6 in http://www.w3.org/TR/media-source/#duration-change-algorithm

Matt: I will respond to this bug, resolve it WONTFIX since Infinity is a known value (it means unbounded). The only unknow value is NaN which is the initial value.
MSE Bug 28857

https://www.w3.org/Bugs/Public/show_bug.cgi?id=28857

[MSE] Support attachment (and inspection) of MediaSource to HTMLMediaElement via HTMLMediaElement.srcObject

See suggested change in https://www.w3.org/Bugs/Public/show_bug.cgi?id=28857#c1

First the HTML5 reference is http://www.w3.org/TR/html5/embedded-content-0.html#location-of-the-media-resource

The HTML5.1 reference is http://www.w3.org/html/wg/drafts/html/master/semantics.html#location-of-the-media-resource

paulc: The question here is if we want to align MSE 1.0 with a feature that is not in HTML5 but is in HTML5.1
... we could fork MSE 1.0 to start working on MSE 1.1, we could start a list of future features to include this one, etc.
... So the summary here is that adding this 5.1 feature would definitely taking MSE out of CR and back to WD or LC

<MattWolenetz> https://www.w3.org/Bugs/Public/page.cgi?id=fields.html#bug_status

Matt will update as RESOLVED LATER and we can in the future collect together additional features for a new version of MSE
Range removal algorithm

Matt: There is set of related bugs on the range removal algorithm

<MattWolenetz> bugs 27980, 27982 and one other like "no frame removed on duration truncation"

https://www.w3.org/Bugs/Public/show_bug.cgi?id=27980

https://www.w3.org/Bugs/Public/show_bug.cgi?id=27982

Matt: There two bugs are dependent on each other
... The problem here is fall out from moving the algorithm from synchronous to asynchronous

jerry: I will comment on the bug after the meeting.

paulc: Add the third bug to the dependency list.
Next meeting

proposal is that EME next week and then return to MSE in two weeks

And note Zakim is going away and we are switching to Webex for future meetings. so the phone call changes.

Webex information: https://www.w3.org/wiki/HTML/Media_Task_Force/Call

Summary of Action Items
[End of minutes]
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$Date: 2015/06/30 16:08:05 $
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Present: paulc MattWolenetz davide jdsmith

Agenda: https://lists.w3.org/Archives/Public/public-html-media/2015Jun/0046.html

Found Date: 30 Jun 2015

Guessing minutes URL: http://www.w3.org/2015/06/30-html-media-minutes.html

People with action items:


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