Media Fragments Working Group: Agenda 01 April, Telecon 0900 UTC

Dear Media Fragmenters,

Please, find below the agenda for this week telecon. Please, note that
Europeans are back to the *old* hour, but *NOT* Silvia and Conrad. Use
the link below to see the telecon hour depending on your time zone.

The scribe will be Silvia (Guillaume is on deck), please, make sure you
can make it! Yves has sent regrets.
Best regards.

   Erik & RaphaŽl


AGENDA Teleconference
W3C Media Fragments Working Group telephone conference 2009-04-01

Wednesday, 01 April *09:00-10:00 UTC*
Local time:
01 April 2009, 0900 UTC
                   0200 (West US)
                   0500 (East US)
		  1000 (Galway)
                   1100 (Amsterdam)
                   1800 (Seoul)
                   2000 (Sydney)
Bridge US: +1-617-761-6200 (Zakim)
Bridge FR: +
Bridge UK: +44.117.370.6152
Conference code : 3724# (spells "FRAG")
Duration : 60 minutes
IRC channel          : #mediafrag on
W3C IRC Web Client   :
Other clients are listed at
Zakim information    :
Zakim bridge monitor :
Zakim IRC bot        :

Chair: Raphael, Erik
Scribe: Silvia (On Deck: Guillaume, Michael)
Regrets: Yves

Please note that Media Fragments WG telecons are for attendance by
members and invited experts only.

* Roll call
* PROPOSED to accept the minutes of the 25th March 2009 telecon:
* Telecon hour: should we move to 1000 UTC? 1100 UTC?

2. Upcoming F2F Meeting in Barcelona:
* ACTION-50 Erik to Inquire about attendance for the upcoming f2f
* Agenda building


3.1 Syntax:
* ACTION-49: Yves to Draft the HTTP-Range syntax for different units
(completing all the syntax for the two way handshake)
* Errors found by Jack while implementing:
. Don't put single quote (') in an utf8string,
. Don't put sub-delims (e.g. &) in an utf8string,
. Spell 'percent' instead of using the '%' character,

3.2 Existing Technologies Survey (Erik)
* ACTION-51: Erik to Summarize the content of the wiki page to put in
the main document, with few examples and a short story

3.3 HTTP implementation (Raphael)
* ACTION-52: Raphael to Replace all examples in the HTTP implementation
wiki page with the video Jack took

3.4 Use Cases & Requirements Discussion: (Silvia)
   . Raphael:
   . Jack:
   . Guillaume:
   . Davy:

4. Implementation:
* ACTION-34: Jack to look at python-url library to see whether he could
implement the logic on client side
* ACTION-35: Raphael to look at curl and/or wget to see whether the
logic could be implemented on client side
* ACTION-53: Jack to Check whether ffmpeg can slide movies easily, need
for implementation on client and server side
See also:
   . Issue related to transcoding: is it allowed when cropping or not? 
Does ffmpeg produce only transcoded versions of a fragment, which 
triggers a problem when caching the resource? How ffmpeg does 
communicate the exact timeframe returned after the clipping operation 
(often different from the client request)? How the audio and video sync 
is guaranteed, see also Does ffmpeg 
have problem with spatial cropping only when a percentage relative 
values are used?
   . Issue related to spatial cropping: where that happens (client or 
server side)? how to communicate the original size when using percentage 

* ISSUE-3 [Michael]: Does our MF URI syntax imply that we need to update
** Some related discussion on the TAG mailing list (started by Michael):
   - Thread
   - Thread
** ACTION-42: Michael to dig deeper into the video/* issue proposed by TimBL
** ACTION-47: Michael to write the options related to the semantics of
media fragments and the procedure on the wiki

* ISSUE-4 [Silvia]: Should we pre-define some track names?

6. AOB

RaphaŽl Troncy
CWI (Centre for Mathematics and Computer Science),
Kruislaan 413, 1098 SJ Amsterdam, The Netherlands
e-mail: &
Tel: +31 (0)20 - 592 4093
Fax: +31 (0)20 - 592 4312

Received on Monday, 30 March 2009 22:04:17 UTC