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<trackbot> Date: 23 June 2010
<Yves> Agenda: http://lists.w3.org/Archives/Public/public-media-fragment/2010Jun/0052.html
<scribe> scribe: raphael
<scribe> scribenick: raphael
PROPOSED to accept the minutes of the 6th F2F meeting
http://www.w3.org/2010/06/15-mediafrag-minutes.html
<davy> `+1
http://www.w3.org/2010/06/16-mediafrag-minutes.html
+1
<jackjansen> +1
Minutes are accepted
<erik> +1
ACTION-174?
<trackbot> ACTION-174 -- Yves Lafon to produce the common syntax block -- due 2010-06-22 -- OPEN
<trackbot> http://www.w3.org/2008/WebVideo/Fragments/tracker/actions/174
close ACTION-174
<trackbot> ACTION-174 Produce the common syntax block closed
From Silvia:
scribe: Section 4.1 has the following bit of ABNF:
namevalues = namevalue *( "&" namevalue )
namevalue = name [ "=" value ]
name = fragment - "&" - "="
value = fragment - "&"
Yves: actually, we should remove
this block
... this section is both invalid and un-needed
... so the whole group agrees that this section should be
removed
ACTION-178?
<trackbot> ACTION-178 -- Silvia Pfeiffer to review the complete document, remove unnecessary editorial notes before publication -- due 2010-06-23 -- OPEN
<trackbot> http://www.w3.org/2008/WebVideo/Fragments/tracker/actions/178
close ACTION-178
<trackbot> ACTION-178 Review the complete document, remove unnecessary editorial notes before publication closed
Raphael: what do we say about RTSP processing?
Yves: for LC we should not detail
the processing of this
... good to mention that the syntax is generic
... and not only for HTTP
<silvia> +q
Silvia: the messages that go over the protocol is protocol dependant
<davy> Note that we have a description on our wiki about RTSP: http://www.w3.org/2008/WebVideo/Fragments/wiki/UA_Server_RTSP_Communication
Silvia: what we can do is to say
how media fragments URI syntax can be mapped to RTSP
messages
... but don't say how, since we don't have time
<Yves> adding "This specification is not defining the protocol aspect of RTSP handling of media-fragment."
Davy: we could just re-use this wiki page and adapt it to the latest syntax
Yves: problem is that we will need to test this through implementation
<silvia> +q
Yves: while a WG note would not need to be tested
Davy: but we have an implementation of this!
Silvia: I know people who also wants to have an implementation ... so it must not be difficult
Yves: I think RTSP is useful ...
but I suggest to have it in another document
... but I want to speed up the process
... so I prefer to have another document
<silvia> if we think it is hard to include RTSP after LC, I think it would make more sense to include it now
Jack: I think it is a good idea
to put it into another document
... let me explain why it is a bad idea to include RTSP
handling at *this* stage
... the fact that we have one working implementation does not
mean we understand fully the mechanism
<silvia> RTSP has been developed with the fragment functionality as part of the protocol
Jack: except if Davy ensures he got all issues fixed
Davy: I'm also in favor of putting this into another document ... and take our time to check how it works
<silvia> how hard is it to include this later into the document then, when we make it a separate document now?
<silvia> why would it delay the LC?
<silvia> no, not to remove it later - to update it later with more information
<Yves> delay the LC as we would need to review it
<Yves> I am not happy in adding at the last minute something as big as that without _any_ review before
<Yves> and reviewing introduces delays
<silvia> we don't know everything about caching right now either - there will be more updates necessary
<silvia> so, if it is easy to add things later, I am fine
<erik> +1 to Silvia
<silvia> but if that would be a problem, I object to making it a separate document, because we are ripping apart where ppl can find information about media fragments
<Yves> why?
<silvia> I would need to tell ppl: find the spec of URI fragments here, but how to use it with rtsp in this other doc
<Yves> if someone want to use mediafrag in protocol 'bar' later on does it mean that we will have to revise our doc to add this new protocol?
Michael: we can include it and ask the community for feedback
<Yves> no silvia, the rtsp spec will refer to the uri syntax one
<silvia> it's not like rtsp is a new protocol
<Yves> we expect people to be smart enough to understand what they read no?
<silvia> Yves: it's still 2 docs
Jack: not at LC stage, you're supposed to have scope the spec
<Yves> and?
<Yves> do we want to merge rfc2616 and 3987 as well in our doc?
Jack: this discussion is
procedural
... we all agree we will like to have rtsp in the spec
... the question is whether adding it now, add a cost of 2
months we don't have!
... does it give us enough benefits ?
Erik: what is wrong of adding it
now, few days of copy-pasting
... and review it during LC
<silvia> I agree
<silvia> it also gives ppl from that community a need to review it
Yves: it is not healthy to add
things not which hasn't been reviewed
... LC should have been published 6 months ago
Davy: do we want to be LCWD asap or do we want to cover RTSP?
Jack: the second document is not
that important ... since under my understanding, the problem of
implementing with RTSP is trivial
... and if it turns to not be trivial, then it will fit a 2.0
version of the spec
<erik> again +1 to Silvia
Silvia: but if if is trivial, then why not including it now in the document
Jack: what I have said is that
with *my* understanding, it is trivial
... but I might be very wrong
Silvia: problem is that you will
not trust a note
... and this is pushing people of our spec
... i'm unhappy in splitting the document into multiple
docs
Raphael: looking at the
charter
... "The Group will focus on developing a mechanism to uniquely
identify a temporal fragment within an audio or video object,
that is independent of the underlying audio or video codec in
use, and will also investigate the delivery of the requested
resource to allow full or partial media retrieval using at
least the HTTP protocol. "
<silvia> zaim, mute me
Silvia: do we really need to understand all the bits of the spec?
Erik: I fully agree with what Silvia has said
Yves: looking at our traffic on
our mailing list, not that many emails about rtsp
... we haven't received enough attention and review on this
point
<jackjansen> same point as yves
<silvia> rtsp got less review because it was much simpler and needed no discussion
Raphael: the wiki page has never been included in the doc so that might explain the lack of attention
Yves: having everything in one
doc is silly anyway, even html5 is slowly moving away from
this
... I don't see studies that people will not look at 2
documents
Raphael: this is a problem of compactness
<silvia> proposal: could we have a few days of review for the rtsp section and then make the decision?
<silvia> by when do we need to make the decision to move the doc to LC?
Jack: the documents is a workaround solution
<silvia> one more week should be enough to learn more about rtsp and make a decision either way
Jack: the problem is not looking
at our wiki page which is ok
... the problem is looking at the rtsp spec
... and make sure we are not saying stupid things
<silvia> I think you can read the rtsp spec within an hour, honestly
<silvia> I would look at it
Silvia: yes, I have already used rtsp implementations
Raphael: I wonder Yves how would you rate your knowledge of rtsp?
Silvia: i think for temporal
fragment over rtsp, there is no problem
... we might have problems with other dimensions
... as Yves said, the problem of cutting the media depending on
the codec is the same
... we just have the protocol to fix
Davy: I have also a number of concerns about smpte time codes for rtsp
<Yves> raphael, I would qualify it as 'very rusty'
Davy: rtsp does not have the
content mapping
... should we define it as well for rtsp ?
... I think there are things that MUST been discussed
before
... and I don't think it is feasible in one week
Silvia: assuming we do not know
all the details, does not make sense to at least include what
we have now in the spec?
... actually, the best way to have feedback on what we have is
to include it in the document
... afterwards, we might take out this part if we have not
enough technical knowledge
... I see this section as mature as others
Raphael: I think I disagree with this latest statement
<Yves> I am strongly against putting a whole new section that didn't get _any_ review and raises lots of question in a LC document
<Yves> in a regular WD yes, but not on a LC
<silvia> what comes after LC?
<jackjansen> Example of problem witrh rtsp: interaction with section 10.0 REDIRECT
<silvia> I think we will have a second LC anyway
Jack: I think we should not do
it, not include rtsp into this doc
... we need much serious thoughts
<jackjansen> http://tools.ietf.org/html/rfc2326#page-39
<silvia> ok, I won't stand in the way
<Yves> we can have multiple LC for sure
<Yves> even CR->LC phases
<Yves> note that I completely agree to have a new WD for RTSP, that we can fasttrack if the doc is in good shape
Raphael: I suggest to add a link towards a wiki page to get feedback
<mhausenblas> +1
<silvia> isnt' that like admitting we aren't finished with the doc for LC?
Raphael: and a generic sentence stating the importance of the genericity of the URI syntax
<silvia> ok, fair enough
<erik> +1
<silvia> I retract my objection
<davy> +1
<silvia> 0
Raphael: 0
<jackjansen> +1
<scribe> ACTION: troncy to address RTSP handling, pointing to the wiki page for the processing, making sure the syntax is stated to be generic [recorded in http://www.w3.org/2010/06/23-mediafrag-minutes.html#action01]
<trackbot> Created ACTION-179 - Address RTSP handling, pointing to the wiki page for the processing, making sure the syntax is stated to be generic [on Raphaƫl Troncy - due 2010-06-30].
Section 7.4 should it be removed?
ALL: yes
Raphael: ok, I will remove it
close ACTION-178
<trackbot> ACTION-178 Review the complete document, remove unnecessary editorial notes before publication closed
<silvia> requirements have been turned into normal text
<silvia> done :)
<silvia> but the requirements document is referenced at the start of the document
Raphael: multiple tracks, is it all clear now?
Silvia: no, sometimes we say one,
and sometimes multiple ones
... it must be consistent
... my question is: do we translate this into one header in the
request?
... the question is do we want to have multiple occurrences of
"track" in the URI and a single one in the header?
Jack: do we need to escape semi-colon?
<silvia> question is: do we agree that there are several "track" parameters in the URI, but only a single on in the HTTP header with the different tracks separated by semicolon
Yves: mutiple tracks mean many
many many packets
... we cannot handle this in a multi-part message response
Davy: the response might be a
redirect
... the problem is for the request
Yves: the plan is to use the comma in the request as a separator
Jack: people are aware that the fact we are using %escaping UTF-8 strings in the headers?
<silvia> I can make these changes, yes
Silvia: we are waiting for i18n answer
Jack: we need to take a decision when they reply
Yves: it will be a LC issue
... no problem
Raphael: Does WebM fit in our table?
<silvia> thanks, bye!
<scribe> ACTION: davy to add the WebM codec into our fitting table [recorded in http://www.w3.org/2010/06/23-mediafrag-minutes.html#action02]
<trackbot> Created ACTION-180 - Add the WebM codec into our fitting table [on Davy Van Deursen - due 2010-06-30].
Summary: document edited once more today, and then LCWD issue, publication hopefully tomorrow
[meeting adjourned]