20-mediafrag-minutes.html
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<title>Media Fragments Working Group Teleconference -- 20 Oct
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<h1>Media Fragments Working Group Teleconference</h1>
<h2>20 Oct 2010</h2>
<p><a href=
'http://lists.w3.org/Archives/Public/public-media-fragment/2010Oct/0013.html'>
Agenda</a></p>
<p>See also: <a href=
"http://www.w3.org/2010/10/20-mediafrag-irc">IRC log</a></p>
<h2><a name="attendees" id="attendees">Attendees</a></h2>
<div class="intro">
<dl>
<dt>Present</dt>
<dd>Philip, raphael, davy, jack_(irc), silvia, Yves</dd>
<dt>Regrets</dt>
<dd>Erik, Jack</dd>
<dt>Chair</dt>
<dd>Raphael</dd>
<dt>Scribe</dt>
<dd>raphael</dd>
</dl>
</div>
<h2>Contents</h2>
<ul>
<li>
<a href="#agenda">Topics</a>
<ol>
<li><a href="#item01">1. Admin</a></li>
<li><a href="#item02">2. MEDIA FRAGMENT EXTENSION</a></li>
<li><a href="#item03">3. Implementation experiment</a></li>
<li><a href="#item04">4. AOB</a></li>
</ol>
</li>
<li><a href="#ActionSummary">Summary of Action Items</a></li>
</ul>
<hr />
<div class="meeting">
<p class='phone'></p>
<p class='phone'></p>
<p class='irc'><<cite>trackbot</cite>> Date: 20 October
2010</p>
<p class='irc'><<cite>scribe</cite>> Scribe: raphael</p>
<p class='irc'><<cite>scribe</cite>> Scribenick:
raphael</p>
<h3 id="item01">1. Admin</h3>
<p class='phone'>PROPOSED to accept the minutes of the 06
October 2010 telecon</p>
<p class='phone'><a href=
"http://www.w3.org/2010/10/06-mediafrag-minutes.html">http://www.w3.org/2010/10/06-mediafrag-minutes.html</a></p>
<p class='irc'><<cite>foolip</cite>> +1</p>
<p class='irc'><<cite>davy</cite>> +1</p>
<p class='phone'>minutes are accepted</p>
<p class='phone'>ACTION-185?</p>
<p class='irc'><<cite>trackbot</cite>> ACTION-185 -- Yves
Lafon to book zakim for the 2 days meeting of the group on Mon
1st and Tue 2nd Nov -- due 2010-09-29 -- OPEN</p>
<p class='irc'><<cite>trackbot</cite>> <a href=
"http://www.w3.org/2008/WebVideo/Fragments/tracker/actions/185">
http://www.w3.org/2008/WebVideo/Fragments/tracker/actions/185</a></p>
<p class='irc'><<cite>foolip</cite>> November 1 and 2,
any time between 0800 and 1800 in UTC+2</p>
<p class='phone'><cite>Raphael:</cite> for Silvia and Philip,
could you write down time slot where we can phone you</p>
<p class='irc'><<cite>silvia</cite>> Monday is better for
me than Tuesday - it's both in the afternoon/evening for me, I
think</p>
<p class='irc'><<cite>foolip</cite>> in other words, any
time is fine, since I'm in the same timezone as TPAC</p>
<p class='irc'><<cite>silvia</cite>> if you start early,
I can join in the mornings</p>
<h3 id="item02">2. MEDIA FRAGMENT EXTENSION</h3>
<p class='phone'>ACTION-189?</p>
<p class='irc'><<cite>trackbot</cite>> ACTION-189 --
Raphaël Troncy to put the top-level production rules back into
the document (in section 4.3.5 or 4.1) -- due 2010-10-06 --
OPEN</p>
<p class='irc'><<cite>trackbot</cite>> <a href=
"http://www.w3.org/2008/WebVideo/Fragments/tracker/actions/189">
http://www.w3.org/2008/WebVideo/Fragments/tracker/actions/189</a></p>
<p class='irc'><<cite>silvia</cite>> ok</p>
<p class='irc'><<cite>foolip</cite>> can't say anything
until I see the actual suggestion for the spec</p>
<p class='phone'><cite>Raphael:</cite> I will implement the
ACTION-189 in the spec and ask all the group if we can close
this issue</p>
<h3 id="item03">3. Implementation experiment</h3>
<p class='phone'><cite>Raphael:</cite> problem with pixels, are
we talking about physical pixels or css pixels?</p>
<p class='phone'><cite>Silvia:</cite> pixels in video are
always a problem</p>
<p class='phone'><cite>Raphael:</cite> I'm looking for a
reference that we could use so that any developers understand
what we are talking about</p>
<p class='phone'><cite>Philip:</cite> this definition is
provided by HTML5 and not CSS</p>
<p class='irc'><<cite>foolip</cite>> <a href=
"http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#concept-video-intrinsic-width">
http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#concept-video-intrinsic-width</a></p>
<p class='irc'><<cite>foolip</cite>> <a href=
"http://dev.w3.org/html5/spec/video.html#concept-video-intrinsic-width">
http://dev.w3.org/html5/spec/video.html#concept-video-intrinsic-width</a></p><a name="action01"
id="action01"></a>
<p class='irc'><<cite>scribe</cite>>
<strong>ACTION:</strong> troncy to update our spec to talk
about video intrinsic width [recorded in <a href=
"http://www.w3.org/2010/10/20-mediafrag-minutes.html#action01">http://www.w3.org/2010/10/20-mediafrag-minutes.html#action01</a>]</p>
<p class='irc'><<cite>trackbot</cite>> Created ACTION-190
- Update our spec to talk about video intrinsic width [on
Raphaël Troncy - due 2010-10-27].</p>
<p class='irc'><<cite>foolip</cite>> well, there's an
issue we discussed at FOMS</p>
<p class='phone'><cite>Davy:</cite> this issue is solved</p>
<p class='irc'><<cite>foolip</cite>> ah :)</p>
<p class='phone'><cite>Davy:</cite> there is indeed too many
byte ranges to send to the UA</p>
<p class='irc'><<cite>foolip</cite>> do you always
redirect, or just when number of ranges > n ?</p>
<p class='phone'><cite>Davy:</cite> therefore, we send a
redirect pointing to a media fragment with the ?</p>
<p class='irc'><<cite>foolip</cite>> always seems simpler
:)</p>
<p class='phone'><cite>Davy:</cite> currently, always
redirect</p>
<p class='phone'><cite>Raphael:</cite> the UA issues a new
request with the query parameter</p>
<p class='phone'><cite>Davy:</cite> yes, and we had a Link
header pointing to the master resource</p>
<p class='phone'><cite>Philip:</cite> we could implement that
but I really wonder if it is useful<br />
... we will always need a specialized server<br />
... so the query parameter migt be enough</p>
<p class='phone'><cite>Davy:</cite> there are other scenarios
where the # is useful<br />
... we should have both<br />
... even if in the retrieval scenario, the # will always be
converted into the ?</p>
<p class='phone'><cite>Philip:</cite> what should we do with
the name dimension</p>
<p class='phone'><cite>Davy:</cite> in MP4, refer to the cue
points; in Matroska, refer to the chapters names</p>
<p class='phone'><cite>Philip:</cite> OK, yes the chapters are
part of WebM</p>
<p class='irc'><<cite>silvia</cite>> and Ogg can have
chapters through a srt chapter track in Ogg Kate</p>
<p class='phone'><cite>Raphael:</cite> ok, so it seems
important that we cover the name dimension even if it is
limited to chapter names!<br />
... last issue from Philip, make the hour optional in
specifying the time dimension<br />
... currently, we need one or two digits<br />
... but most clips have duration less than 1 hour<br />
... but the grammar will be more complicated<br />
... because we could then have just one digit for the
minutes</p>
<p class='phone'><cite>Philip:</cite> in WebSRT, the hours are
optional</p>
<p class='phone'><cite>Raphael:</cite> I suggest we discuss
this at the F2F</p>
<p class='irc'><<cite>silvia</cite>> I would support that
if you can find a grammar to describe it correctly - it's also
more complicated to implement then, btw</p>
<p class='phone'>Look at the demos at <a href=
"http://www.w3.org/2008/WebVideo/Fragments/code/plugin/demos/">http://www.w3.org/2008/WebVideo/Fragments/code/plugin/demos/</a></p>
<p class='phone'><cite>Davy:</cite> yes, Ninsuna understands
range request with SMPTE time codes<br />
... and answers with smpte time codes<br />
... though I need to check</p>
<p class='phone'>Yes Silvia, that's also our conclusion, re the
grammar</p>
<p class='phone'><cite>scribe:</cite> the questio is who is
willing to work out this more complex grammar? I suggest to
hack this during the f2f but if you want to work on it before,
please feel free</p>
<p class='irc'><<cite>silvia</cite>> do it with Yves - he
is good at that stuff :)</p>
<h3 id="item04">4. AOB</h3>
<p class='phone'>no other topic to discuss</p>
<p class='phone'>meeting adjourned</p>
<p class='irc'><<cite>foolip</cite>> ok, about the syntax
then</p>
<p class='irc'><<cite>foolip</cite>> it's be simplest to
just say that all components are 1 or 2 digits</p>
<p class='irc'><<cite>foolip</cite>> ugly, but simpler,
and simple is good :)</p>
<p class='phone'>:-)</p>
<p class='irc'><<cite>foolip</cite>> but let's discuss
that further later</p>
<p class='phone'>we will see what the grammar should loook
like, indeed, Yves might be able to sort that out elegantly</p>
</div>
<h2><a name="ActionSummary" id="ActionSummary">Summary of Action
Items</a></h2><!-- Action Items -->
<strong>[NEW]</strong> <strong>ACTION:</strong> troncy to update
our spec to talk about video intrinsic width [recorded in
<a href="http://www.w3.org/2010/10/20-mediafrag-minutes.html#action01">
http://www.w3.org/2010/10/20-mediafrag-minutes.html#action01</a>]<br />
<br />
[End of minutes]<br />
<hr />
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$Date: 2010/10/20 09:48:54 $
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