- From: Jim Allan <jimallan@tsbvi.edu>
- Date: Tue, 3 Jun 2014 08:37:05 -0500
- To: Daniel Davis <ddavis@w3.org>, WAI-ua <w3c-wai-ua@w3.org>, HTML A11Y TF Public <public-html-a11y@w3.org>
- Cc: Jeanne Spellman <jeanne@w3.org>, Kelly Ford <Kelly.Ford@microsoft.com>
- Message-ID: <CA+=z1W=SAhvvdy0gPFQqWD++YDF-4iEw82_Ayvcv+_+T=z7M=g@mail.gmail.com>
Hi Daniel On Tue, Jun 3, 2014 at 7:50 AM, Daniel Davis <ddavis@w3.org> wrote: > Hi Jim, > > Thanks for the compliment! > > Regarding the requirements, bullet 2 is already covered by user agents > that support playbackRate - when the speed is changed the pitch stays > the same. > That is excellent news! another bullet checked off > > For bullet 4, however, no browser (that I know of) supports Reset yet, > and they don't even support changing the rate as part of the native > controls either. As you say, it's easy to implement, both in the browser > and by authors, but the biggest blocker may be how to add such functions > to the UI while keeping them simple to use. Browser vendors so far have > kept their media controls to a bare minimum so the more practical > approach may be to encourage third-party media players [1] to > incorporate such a feature. My impression is that most sites in the wild > use these media player libraries which allow more customisation and > cross-browser compatibility, rather than rely on built-in players. > Ideally, the UA would have a robust/full set of controls. the author could choose a 'standard set' of controls to provide on their page. And, the user could choose to have a different more robust set always turned on in their browser to meet their needs, without the author having to do extra work. I am sure there are technical details that will make this much more complicated than I wish it were. I understand about authors using 3rd party players, the range of abilities (and holes in feature sets - especially accessibility) is a bit daunting for authors and troublesome for users. Do you know if there is a way to override the authors choice of 3rd party player and use the native browser video player instead? Jim > > Hope this helps, > Daniel > > [1] http://praegnanz.de/html5video/ > > On 03/06/14 21:31, Jim Allan wrote: > > Hi Daniel, > > great demo. is there a possibility that a browser might include these > > control as part of their standard control set for the media elements? > > The User Agent Accessibility Guidelines has a success criteria - > > > > > > 2.11.4 Adjustable Playback Rate for Prerecorded Content: > > > > The user can adjust the playback rate of prerecorded time-based media > > content, such that all of the following are true: (Level AA) > > > > * *Playback Rate:* The user can adjust the playback rate of the > > time-based media tracks to between 50% and 250% of real time. > > * *Pitch:* Speech whose playback rate has been adjusted by the user > > maintains pitch in order to limit degradation of the speech quality. > > * *Synchronization:* Audio and video tracks remain synchronized > > <http://jspellman.github.io/UAAG/UAAG20/#def-synchronize> across > > this required range of playback rates. > > * *Reset:* The user agent provides a function that resets the playback > > rate to normal (100%). > > > > your demo takes care of bullets 1 and 3. I tweaked the rate to 250%. Do > > you know of any UAs or authoring techniques that will cover bullets 2 > and 4? > > > > I would imagine that Reset would be simple to implement by the UA (if > > they included playbackRate in the default Controls) or by the author. > > Our (UAWG) preference would be for the UA to provide the functionality > > so it would be available to all and accessible. The author could skin > > the control. > > > > > > On Mon, Jun 2, 2014 at 7:35 PM, Daniel Davis <ddavis@w3.org > > <mailto:ddavis@w3.org>> wrote: > > > > Hi Janine, > > > > Regarding your possible new use case - timescale modification - I > had a > > similar use case but was told on the TV IG call that it already > exists. > > I made a demo to test it and sure enough, HTML5 video and audio > elements > > have a playbackRate attribute that can be changed on-the-fly. Maybe > this > > covers your use case as well. > > > > Anyway, the demo is here if you'd like to try it out: > > http://daniemon.com/tech/html5/playbackRate/ > > > > Cheers, > > Daniel > > > > On 03/06/14 04:47, Mark Sadecki wrote: > > > Thanks to everyone who attended today's Media Sub-Group meeting. > > Below are the > > > minutes in HTML and text format. > > > > > > HTML: > > > http://www.w3.org/2014/06/02-html-a11y-media-minutes.html > > > > > > TEST: > > > [1]W3C > > > > > > [1] http://www.w3.org/ > > > > > > HTML Accessibility Task Force Media Sub-Group > > > > > > 02 Jun 2014 > > > > > > See also: [2]IRC log > > > > > > [2] http://www.w3.org/2014/06/02-html-a11y-media-irc > > > > > > Attendees > > > > > > Present > > > JF, MarkS, Kazuyuki, janina, ShaneM, wuwei > > > > > > Regrets > > > Chair > > > MarkS > > > > > > Scribe > > > MarkS > > > > > > Contents > > > > > > * [3]Topics > > > 1. [4]Identify Scribe > > > 2. [5]TV & Web: Use Cases and Requirements (update) > > > 3. [6]Processing Media Accessibility User Requirements > > > Comments > > > 4. [7]Full Transcript > > > * [8]Summary of Action Items > > > __________________________________________________________ > > > > > > <trackbot> Date: 02 June 2014 > > > > > > Identify Scribe > > > > > > <scribe> scribe: MarkS > > > > > > TV & Web: Use Cases and Requirements (update) > > > > > > <kaz> [9]Web&TV minutes > > > > > > [9] http://www.w3.org/2014/05/28-webtv-minutes.html > > > > > > KAZ: Talked about new use cases on May 28. Everyone was very > > > impresed and interest > > > ... TV Broadcast chair, volunteered to take the lead and check > > > the use cases in detail. > > > ... need to identify what is new and which ones are just > > > extensions. > > > ... may need to reword a bit to fit the IGs use cases better > > > ... the IG has started to review use cases submitted by john > > > and mark. The new use cases submitted by janina will be added > > > to 2nd generation. > > > > > > JS: I have a new one that is related to timescale modification. > > > think it would be good to have a use case for it > > > ... useful for people who watch videos in a non-domininant > > > language > > > ... to slow it down > > > > > > KAZ: Might want to mention advantages to i18n as well > > > > > > JS: useful for travellers as well > > > > > > MS: do you think we will be able to provide feedback on the > > > outcome of that work soon? > > > > > > KAZ: yes > > > ... no date yet, will let you know soon. > > > ... AC meeting is next week, so it may take longer than > > > expected. > > > > > > MS: anyone attending AC that would be useful to talk to? > > > > > > KAZ: i will ask > > > > > > JS: i will be there on Monday > > > > > > KAZ: I wanted to thank everyone for your work. great use cases. > > > > > > Processing Media Accessibility User Requirements Comments > > > > > > [10]http://www.w3.org/WAI/PF/media-a11y-reqs/ > > > > > > [10] http://www.w3.org/WAI/PF/media-a11y-reqs/ > > > > > > [11]http://www.w3.org/WAI/PF/media-a11y-reqs/#KA-1 > > > > > > [11] http://www.w3.org/WAI/PF/media-a11y-reqs/#KA-1 > > > > > > SM: what are we doing with references to other documents? > > > > > > MS: Keeping an eye and doing our best to predict stability at > > > this point > > > > > > JS: Three steps before we publish > > > ... Need to make sure we are happy with this heartbeat. > > > ... we need to respond to all commenters > > > ... we might want to update vocabulary used since it has > > > changed > > > ...RE: section 4.8 might be a good time to re-write that > > > section. Shouldn't taken long. > > > ... know what we need to say and have gotten feedback > > > ... know we can at least change the title, which is very > > > awkward. Can probably use new term, second screen > > > > > > JF: That is very awkward. probably shorten it down. If we are > > > going to use second screen, we want to indicate that it refers > > > to one or more screens/devices > > > > > > JS: If you look at Sylvia's response to my email, that > > > addresses that. > > > ... there is understanding that it it more than one or two or > > > three additional devices. > > > ... I wonder if there is a definition somewhere that we can > > > reference > > > > > > JF: there is a second screen community group > > > > > > KAZ: that group is converting to a working group > > > > > > <JF> [12]http://www.w3.org/community/webscreens/ > > > > > > [12] http://www.w3.org/community/webscreens/ > > > > > > JF: the CG has a definition > > > > > > KAZ: Use Cases and requirements were discussed in the Web & TV > > > IG, and some of the participants launched a Community Group > > > based on the requirements > > > > > > JF: This is a very quiet group. There are some knowlegeable and > > > experienced participants. > > > ... lot of people watching it, but not a lot going on. > > > > > > JS: so there may be an API? > > > > > > KAZ: yes > > > > > > JS: That is important > > > > > > <kaz> [13]Presentation API > > > > > > [13] http://webscreens.github.io/presentation-api/ > > > > > > JF: If we're going to use this term, we need to have it clearly > > > defined > > > ... there is a concise defintion here. we may want to have a > > > more formal definition somewhere > > > > > > JS: it could be a set of bluetooth headphones... > > > > > > SM: maybe we should call it secondary device > > > > > > JS: I'm not picky about the distinction, but understand its not > > > always literally a visual display > > > > > > JF: so, the discussion is whether or not we want to use the > > > term second screen, but based on this convo, it might be too > > > limiting > > > > > > SM: It's not second, its secondary > > > > > > <JF> suggestion: 4.8 Requirements on the parallel use of > > > alternative content on secondary screens and other devices > > > > > > <janina> > > > [14]http://lists.w3.org/Archives/Public/public-html-a11y/2014Ma > > > y/0099.html > > > > > > [14] > > > http://lists.w3.org/Archives/Public/public-html-a11y/2014May/0099.html > > > > > > JS: I think we can take out alternative. Secondary screens and > > > other devices is circular, self-referential > > > > > > <ShaneM> suggestion: 4.8 Requirements on secondary screens and > > > other devices > > > > > > JS: I like that > > > > > > JF: I like that > > > > > > MS: me too > > > > > > JS: the rest of the section needs to be improved as well > > > ... take out references to UAAG and put it in the document > > > directly > > > ... I propose I take an action to rewrite this section > > > > > > JF: Looking at comment from Jim Allen, the title and intro > > > should be changed. > > > ... we can remove that comment and make sure the rest of the > > > comments from UAAG have been addressed. > > > > > > JS, MarkS, and JF will not be available next week. Propose > > > skipping next weeks meeting. Review rewritten text for this > > > section in two weeks > > > > > > JF: I think we just need to focus on the title and the > > > preamble. I think we can work on this via email > > > > > > JS: Has there been any discussions in other groups regarding > > > this section, or were they not aware that this applies to 2nd > > > screen > > > > > > KAZ: the idea of 2nd screen itself is not necessarily a > > > secondary device. During the Munich workshop, some participants > > > mentioned iPhone or iPad, usually 2nd screen could be the > > > primary device. > > > ... need to be careful how we refer to these devices > > > ... perhpas we can ask them to clarify > > > ... multiple devices or multiple modalities > > > > > > JF: its not talking about screens, its talking about multiple > > > devices, consuming the same media stream, different ways on > > > different devices. > > > ... the group is probably focused on video, not audio. > > > ... I think the preamble is where it needs to be cleaned up. > > > ... its deliberately broad. need to expand on it in the > > > introduction > > > > > > MS: any other sections that need work before we publish next > > > draft? > > > > > > JF: i don't remember reviewing the long list of feedback from > > > UAAG. > > > > > > JS: I think we did that already > > > > > > <JF> (UAAG feedback here: > > > [15]http://lists.w3.org/Archives/Public/public-html-a11y/2010Ju > > > l/0108.html) > > > > > > [15] > > > http://lists.w3.org/Archives/Public/public-html-a11y/2010Jul/0108.html) > > > > > > JF: we should remove link to that sentence then. > > > > > > <scribe> ACTION: MarkS to remove reference to UAWG email in > > > seciton 4.8 [recorded in > > > [16]http://www.w3.org/2014/06/02-html-a11y-media-minutes.html#a > > > ction01] > > > > > > <trackbot> Created ACTION-264 - Remove reference to uawg email > > > in seciton 4.8 [on Mark Sadecki - due 2014-06-09]. > > > > > > JS: EO will look at section two before our fall heartbeat > > > (hopefully LC) > > > > > > JF: Comment 33: CA-4, support filters. Clean audio, still > > > refers to pre-emphasis filters. Did we agree/disagree? > > > ... I think we need to go through these again to make sure they > > > were all addressed > > > ... there are 83 comments > > > > > > JS: We did not accept all of them > > > > > > JF: we refer to pre-emphasis filters. comment suggested we > > > shoudl just use filters > > > > > > JS: i think that was a spelling mistake > > > > > > JF: I will take a quick look at these to make sure they were > > > all addressed. > > > > > > JS: I'll look at minutes to see when we took these comments up > > > > > > Full Transcript > > > > > > JS: we have two proposals > > > > > > [17]https://www.w3.org/WAI/PF/HTML/wiki/Full_Transcript > > > > > > [17] https://www.w3.org/WAI/PF/HTML/wiki/Full_Transcript > > > > > > scribe: Plan 2014 specifies that we can create an extension > > > spec > > > > > > JF: Adrian expressed interest in this. I will have a chat with > > > him. > > > > > > JS: I will look for minutes > > > > > > MS: suggest adding any historical work to this wiki page so we > > > can make an informed decision on how to move forward. > > > > > > next meeting in two weeks > > > > > > Summary of Action Items > > > > > > [NEW] ACTION: MarkS to remove reference to UAWG email in > > > seciton 4.8 [recorded in > > > [18]http://www.w3.org/2014/06/02-html-a11y-media-minutes.html#a > > > ction01] > > > > > > [End of minutes] > > > __________________________________________________________ > > > > > > > > > Minutes formatted by David Booth's [19]scribe.perl version > > > 1.138 ([20]CVS log) > > > $Date: 2014-06-02 19:45:33 $ > > > > > > [19] > > http://dev.w3.org/cvsweb/~checkout~/2002/scribe/scribedoc.htm > > <http://dev.w3.org/cvsweb/%7Echeckout%7E/2002/scribe/scribedoc.htm> > > > [20] http://dev.w3.org/cvsweb/2002/scribe/ > > > > > > > > > > > > > > > -- > > Jim Allan, Accessibility Coordinator & Webmaster > > Texas School for the Blind and Visually Impaired > > 1100 W. 45th St., Austin, Texas 78756 > > voice 512.206.9315 fax: 512.206.9264 http://www.tsbvi.edu/ > > "We shape our tools and thereafter our tools shape us." McLuhan, 1964 > -- Jim Allan, Accessibility Coordinator & Webmaster Texas School for the Blind and Visually Impaired 1100 W. 45th St., Austin, Texas 78756 voice 512.206.9315 fax: 512.206.9264 http://www.tsbvi.edu/ "We shape our tools and thereafter our tools shape us." McLuhan, 1964
Received on Tuesday, 3 June 2014 13:37:32 UTC