- From: Raphaël Troncy <Raphael.Troncy@cwi.nl>
- Date: Wed, 01 Apr 2009 15:04:35 +0200
- To: Media Fragment <public-media-fragment@w3.org>
- CC: Yves Lafon <ylafon@w3.org>
All,
The minutes of this week telecon are available for review at
http://www.w3.org/2009/04/01-mediafrag-minutes.html (and in text format
below).
During the call, the presents agreed to move the telecon hour to be more
convenient for Silvia (She will also switch to winter time this
week-end). From next week, my proposal would be to have the telecon at
12:00 UTC which means:
- San Francisco: 05:00 AM
- Galway: 13:00 PM
- Amsterdam/Ghent/Nice/Pretoria: 14:00 PM
- Tokyo: 21:00 PM
- Sydney: 22:00 PM
http://www.timeanddate.com/worldclock/fixedtime.html?day=08&month=04&year=2009&hour=12&min=00&sec=0&p1=0
If no concern is raised by the end of this week, I would ask Yves if he
could make the request to change the time slot on Zakim until the end of
this (European) summer.
New actions are:
* ACTION: Jack to enter formally in the tracker the ISSUE he has
found, regarding a) transcoding and b) spatial cropping [recorded in
http://www.w3.org/2009/04/01-mediafrag-minutes.html#action05]
* ACTION: Yves to change the formal grammar to have 'percent' spelled
[recorded in http://www.w3.org/2009/04/01-mediafrag-minutes.html#action03]
* ACTION: Yves to change the formal grammar to have unreserved
characters + %-escaped ones in utf8string and _not_ a set of pchars
[recorded in http://www.w3.org/2009/04/01-mediafrag-minutes.html#action04]
Cheers!
Erik & Raphael
-------------
[1]W3C
[1] http://www.w3.org/
- DRAFT -
Media Fragments Working Group Teleconference
01 Apr 2009
[2]Agenda
[2]
http://lists.w3.org/Archives/Public/public-media-fragment/2009Mar/0089.html
See also: [3]IRC log
[3] http://www.w3.org/2009/04/01-mediafrag-irc
Attendees
Present
Erik, Davy, Jack, Raphael, Silvia
Regrets
Michael, Yves, Conrad
Chair
Erik, Raphael
Scribe
Raphael
Contents
* [4]Topics
1. [5]1. Admin
2. [6]2. F2F meeting
3. [7]3. WD Document
4. [8]4. Implementation
* [9]Summary of Action Items
_________________________________________________________
<trackbot> Date: 01 April 2009
<scribe> Scribe: Raphael
<scribe> scribenick: raphael
1. Admin
Propose to accept the minutes of 25/03?
YEs
RESOLUTION: minutes of 25/03 are accepted
Raphael: should we move the telecon hour, to be more convenient for
Silvia ?
Jack: I will miss one telecon every two weeks
Raphael: proposal to have the telecon 2 hours later
... to be more convenient for Silvia
<scribe> ACTION: Raphael asks Silvia if she would like to have the
telecon 2 hours later [recorded in
[10]http://www.w3.org/2009/04/01-mediafrag-minutes.html#action01]
<trackbot> Sorry, couldn't find user - Raphael
trackbot, status
<scribe> ACTION: Raphaël asks Silvia if she would like to have the
telecon 2 hours later [recorded in
[11]http://www.w3.org/2009/04/01-mediafrag-minutes.html#action02]
<trackbot> Created ACTION-54 - Asks Silvia if she would like to have
the telecon 2 hours later [on Raphaël Troncy - due 2009-04-08].
2. F2F meeting
Erik list the participants: Michael, Jack, Erik, Davy, Raphael,
Conrad, David, Franck, Guillaume
scribe: + Yves / Silvia on the phone
3. WD Document
Erik: we will re-organize the section 5 significantly
Raphael: my proposal, finish the document by next Wed 8 of April,
and vote for publishing the document
... in our next telecon
... make a quick publication request
and hope to have the document published on the 9th
Erik: agree
Jack: Michael took my action, because I was busy ... but perhaps I
can take over
... I will send an email to Michael, to ask him if I can take over
Erik: difference between reference and informative sections?
Raphael: informative parts are just for giving hints to the reader,
generally dtd or schemas
3.1: Syntax
Problem 1: not use '%' but spell it
<scribe> ACTION: Yves to change the formal grammar to have 'percent'
spelled [recorded in
[12]http://www.w3.org/2009/04/01-mediafrag-minutes.html#action03]
<trackbot> Created ACTION-55 - Change the formal grammar to have
'percent' spelled [on Yves Lafon - due 2009-04-08].
Problem 2: use of single quote (') and sub-delims in utf8string
<scribe> ACTION: Yves to change the formal grammar to have
unreserved characters + %-escaped ones in utf8string and _not_ a set
of pchars [recorded in
[13]http://www.w3.org/2009/04/01-mediafrag-minutes.html#action04]
<trackbot> Created ACTION-56 - Change the formal grammar to have
unreserved characters + %-escaped ones in utf8string and _not_ a set
of pchars [on Yves Lafon - due 2009-04-08].
3.2: Technologies Survey
Erik and Davy will work on it on Monday / Tuesday
3.3: HTTP implementation
[14]http://www.w3.org/2008/WebVideo/Fragments/wiki/HTTP_implementati
on
[14]
http://www.w3.org/2008/WebVideo/Fragments/wiki/HTTP_implementation
close ACTION-52
<trackbot> ACTION-52 Replace all examples in the HTTP implementation
wiki page with the video Jack took closed
Raphael: how can I have the byte ranges that correspond to my
temporal interval?
Jack: now we are entering into a different problem, that is, should
we do transcoding or not?
... the bytes range will be different depending on transcoding or
not
... I have just sent an email stating we should consider more the
user
... see:
[15]http://lists.w3.org/Archives/Public/public-media-fragment/2009Ap
r/0003.html
[15]
http://lists.w3.org/Archives/Public/public-media-fragment/2009Apr/0003.html
Raphael: I think we should go for your option 2, and define what is
reasonable
... what is the point 4? Is it related to the in-context discussion?
Jack: no, no, no
Point 5: we leave that away, we haven't specified what the spatial
cropping will actually do!
Point 3: it seems to be related to the issue: transcoding or not
Davy: if we want to re-syn the audio and video, then we need to
transcode
Raphael: what is the worst thing that can happen?
Davy: the audio and video might not be aligned
Jack: the reason while I use a wget example, is that you want to
store this piece and re-use it later on
Davy: my proposal was to do no transcoding and have a reasonable
out-of-synch
... same than for the I-Frame
... we choose the closest timeframe
Jack: what is reasonable?
Davy: I think there is studies which show what is the largest
not-synch temporal interval that users can support
... you and I have different interpretation of what we allow for
transcoding
... I prefer Jack's interpretation
Jack: I had interpreted it as "we will not standardise any type of
fragmenting that we think cannot be implemented without using
transcoding".
Davy: I interpret it as "an implementation is not allowed to do any
transcoding".
Davy also now prefers Jack's interpretation
Jack: I think we can standardize a spec that can be implemented
without transcoding
Raphael: I'm also now confused, it is different from your previous
statement
Jack: if we have no boundary cases for media fragments, it should
work
Raphael: should we make the algorithm in the spec, that says, jump
to the previous I-Frame, etc.
Jack: no, we should have in the spec, the user expectation
Silvia: we should send larger sequence, in order to not transcode
<davy> +1 to Silvia
+1 to Silvia
Silvia: get wider intervals, on a best-effort basis
4. Implementation
Silvia: talk about the new ogg spec
<davy> I think mp4 is also capable of skipping frames
Silvia: the YouTube player is also working on a best effort, if you
click on a time offset, then the player goes to the closest frame he
can start to play
Raphael: what is the closest? can it be after?
Silvia: I think it always goes back in time
... I need to check, but this is my experience
close ACTION-53
<trackbot> ACTION-53 Check whether ffmpeg can slide movies easily,
need for implementation on client and server side closed
<jackjansen> give me an action
<scribe> ACTION: Jack to enter formally in the tracker the ISSUE he
has found, regarding a) transcoding and b) spatial cropping
[recorded in
[16]http://www.w3.org/2009/04/01-mediafrag-minutes.html#action05]
<trackbot> Created ACTION-57 - Enter formally in the tracker the
ISSUE he has found, regarding a) transcoding and b) spatial cropping
[on Jack Jansen - due 2009-04-08].
Silvia: I would like to have the telecon 2 hours later
... I think the section use case and requirements is ready
<Gui> I agree
Look at
[17]http://www.w3.org/2008/WebVideo/Fragments/wiki/HTTP_implementati
on
[17]
http://www.w3.org/2008/WebVideo/Fragments/wiki/HTTP_implementation
<Gui> Looking
<Gui> I am all sorry for myself, I didn't know I was late till now !
:-( I thought we were back to normal hours.
Davy: I will use our platform to discover the mapping between
seconds and bytes for this particular video
... and update the wiki
No, AOB, Meeting adjourned
Summary of Action Items
[NEW] ACTION: Jack to enter formally in the tracker the ISSUE he has
found, regarding a) transcoding and b) spatial cropping [recorded in
[18]http://www.w3.org/2009/04/01-mediafrag-minutes.html#action05]
[NEW] ACTION: Raphael asks Silvia if she would like to have the
telecon 2 hours later [recorded in
[19]http://www.w3.org/2009/04/01-mediafrag-minutes.html#action01]
[NEW] ACTION: Raphaël asks Silvia if she would like to have the
telecon 2 hours later [recorded in
[20]http://www.w3.org/2009/04/01-mediafrag-minutes.html#action02]
[NEW] ACTION: Yves to change the formal grammar to have 'percent'
spelled [recorded in
[21]http://www.w3.org/2009/04/01-mediafrag-minutes.html#action03]
[NEW] ACTION: Yves to change the formal grammar to have unreserved
characters + %-escaped ones in utf8string and _not_ a set of pchars
[recorded in
[22]http://www.w3.org/2009/04/01-mediafrag-minutes.html#action04]
[End of minutes]
--
Raphaël Troncy
CWI (Centre for Mathematics and Computer Science),
Science Park 123, 1098 XG Amsterdam, The Netherlands
e-mail: raphael.troncy@cwi.nl & raphael.troncy@gmail.com
Tel: +31 (0)20 - 592 4093
Fax: +31 (0)20 - 592 4312
Web: http://www.cwi.nl/~troncy/
Received on Wednesday, 1 April 2009 13:05:22 UTC