Re: Media Capture and Streams Last Call review; deadline May 15

On 15/04/2015 16:11, "Harald Alvestrand" <harald@alvestrand.no> wrote:

>On 04/15/2015 04:31 PM, Nigel Megitt wrote:
>> Hi Arthur,
>>
>> Does this work include the capture of related streams of media and/or
>>data
>> with common timing references, such as captions or subtitles?
>
>No, it does not.
>
>The concept of synchronization between tracks is mentioned, but only as
>an intent - "this is not a hard requirement" (section 4.1).
>
>Further work could be done to expose timing information and/or link to
>other media forms, but this is not part of the current Last Call.

Thanks. Assuming that the intent of capturing media is to replay it at
some point, clearly it's important to be able to replay it alongside
anything required to support accessibility requirements. It doesn't seem
appropriate to define solutions right now, but it's conspicuous that the
only MediaStreamTrack @kind values listed are audio and video and the only
track source types are camera and microphone. Since this spec could be
used for example to allow capture of live television streams then it
follows that caption (aka subtitle) tracks should additionally be
included, or at least that an extension mechanism is defined to permit
them to be added. Or failing that, that sufficient information is
available to permit a UA to play back a separately obtained caption or
subtitle resource alongside the captured media.

Can I suggest that the HTML Accessibility Task Force and Web Content
Accessibility Guidelines Working Group also be invited to provide review?
I will also make the Timed Text Working Group (which I co-chair) aware,
though conceivably the members will not take a direct interest - just an
indirect one.

>
>>
>> Kind regards,
>>
>> Nigel
>>
>>
>> On 15/04/2015 11:43, "Arthur Barstow" <art.barstow@gmail.com> wrote:
>>
>>> -------- Forwarded Message --------
>>> Subject:       Media Capture and Streams Last Call review
>>> Date:  Wed, 15 Apr 2015 05:31:32 +0000
>>> From:  Stefan Håkansson LK <stefan.lk.hakansson@ericsson.com>
>>> To:    rubys@intertwingly.net <rubys@intertwingly.net>,
>>> Paul.Cotton@microsoft.com <Paul.Cotton@microsoft.com>, mjs@apple.com
>>> <mjs@apple.com>, chaals@yandex-team.ru <chaals@yandex-team.ru>,
>>> art.barstow@gmail.com <art.barstow@gmail.com>, joe@noteflight.com
>>> <joe@noteflight.com>, matthew.paradis@bbc.co.uk
>>> <matthew.paradis@bbc.co.uk>, hillbrad@fb.com <hillbrad@fb.com>,
>>> dveditz@mozilla.com <dveditz@mozilla.com>, w3c@adambarth.com
>>> <w3c@adambarth.com>, Virginie.GALINDO@gemalto.com
>>> <Virginie.GALINDO@gemalto.com>, yosuke@funahashi.cc
>>> <yosuke@funahashi.cc>, giuseppep@opera.com <giuseppep@opera.com>,
>>> mark_vickers@cable.comcast.com <mark_vickers@cable.comcast.com>,
>>> runnegar@isoc.org <runnegar@isoc.org>, tjwhalen@google.com
>>> <tjwhalen@google.com>, daniel.appelquist@telefonica.com
>>> <daniel.appelquist@telefonica.com>, peter.linss@hp.com
>>> <peter.linss@hp.com>, janina@rednote.net <janina@rednote.net>
>>> CC:    Chairs@w3.org Chairs <Chairs@w3.org>
>>>
>>>
>>>
>>> The WebRTC and Device APIs Working Groups request feedback on the Last
>>> Call Working Draft of Media Capture and Streams, a JavaScript API that
>>> enables access to cameras and microphones from Web browsers as well as
>>> control of the use of the data generated (e.g. rendering what a camera
>>> captures in a html video element):
>>> http://www.w3.org/TR/2015/WD-mediacapture-streams-20150414/

>>>
>>> The groups have identified the following other W3C Working Groups as
>>> likely sources of feedback:
>>>
>>> - HTML Working Group, especially the HTML Media Task Force, as our API
>>> extends the HTMLMediaElement interface and defines a new type of media
>>> input via MediaStream
>>>
>>> - WebApps Working Group, especially on the overall usage of Web IDL and
>>> the definition of error handling
>>> Audio Working Group, as the Web Audio API builds upon the MediaStream
>>> interface
>>>
>>> - WAI Protocol and Formats Working Group, especially on the impact of
>>> the user consent dialog and the applicability of the indicators of
>>> device usage in assistive tools
>>>
>>> - Web and TV Interest Group, as the manipulation of media input can be
>>> relevant to some of their use cases (e.g. glass to glass)
>>>
>>> - Web App Security Working Group, especially on our links between
>>> secured origins and persistent permissions, and our current policy with
>>> regard to handling access to this "powerful feature"
>>>
>>> - Web Security Interest Group, especially on our security
>>>considerations
>>> Privacy Interest Group, as access to camera and microphone has strong
>>> privacy implications
>>>
>>> - Technical Architecture Group, for an overall review of the API,
>>> especially the introduction of the concept of a IANA registry-based
>>> constraints system, the use of promises, and our handling of persistent
>>> permissions
>>>
>>> We naturally also welcome feedback from any other reviewers.
>>>
>>> The end of last call review for this specification is set to May 15
>>> 2015; should that deadline prove difficult to meet, please get in touch
>>> so that we can determine a new deadline for your group.
>>>
>>> As indicated in the document, comments should be sent to the
>>> public-media-capture@w3.org mailing list.
>>>
>>> Thanks,
>>>
>>> Frederick Hirsch, Device APIs Working Group Chair,
>>> Harald Alvestrand and Stefan Hakansson, WebRTC Working Group Chairs and
>>> Media Capture Task Force Chairs
>>>
>>>
>>
>>
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Received on Wednesday, 15 April 2015 15:29:07 UTC