[FoRK] announce: y! + xspf

Dan Brickley daniel.brickley at bristol.ac.uk
Thu May 12 15:22:00 PDT 2005

Fwd'd with faked From: field in hope of shortcutting 
some administrivia. Hope Xent.com isn't using SPF yet.


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Date: Thu, 12 May 2005 14:59:07 -0700
To: danbri at w3.org
Subject: Re: [FoRK] announce: y! + xspf
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From: Dan Brickley <danbri at w3.org>
Date: Thu, 12 May 2005 17:59:18 -0400
To: lucas at gonze.com, Luis Villa <luis.villa at gmail.com>,
	meltsner at alum.mit.edu, FoRK Now <fork at xent.com>
Subject: Re: [FoRK] announce: y! + xspf
Message-ID: <20050512215918.GD25518 at homer.w3.org>

* Lucas Gonze <lgonze at panix.com> [2005-05-12 11:48-1000]
> >
> >On 5/12/05, Ken Meltsner <meltsner at gmail.com> wrote:
> >>>On 12-May-05, at 1:33 PM, Lucas Gonze wrote:
> >>>>I dunno about realtime streaming in general. There isn't much internet
> >>>>audio/video that needs to be real time,
> >>
> >>[Disclaimer: this stuff is new to me, so I'm probably going to say
> >>stupid things.  That's how I learn....]
> >>
> >>Video has its own real-time metadata as well -- "closed" (text)
> >>captioning comes to mind; descriptive audio might be another.  I have
> >>a decent handle on how this is included in traditional analog
> >>broadcasts, and it's got to be straightforward to piggyback additional
> >>info using time codes onto a recorded piece (external annotation), but
> >>how does metadata get carried with streaming formats?  Streaming
> >>video/audio, I assume, works by breaking up a feed into a series of
> >>frames, with special frames reserved for metadata.  Or does it wedge
> >>the metadata into each frame, sort of like using the unused portion of
> >>a TV field for other purposes (e.g. captioning)?
> >>
> >>Which reminds me, in the senile manner that I've adopted since hitting
> >>forty: A long time ago, the MIT Media Lab had a project that used
> >>caption text to index news programs.  This was analog TV + captions,
> >>not any new-fangled metadata stream, of course.  Could your playlist
> >>format include the equivalent -- lyrics as well as band info, for
> >>example, or an educational text track describing the techniques used
> >>by the sitar player, or the imagery in a recurring motif?  Music
> >>teachers and budding pop culture specialists around the world would
> >>love it....
> >>
> >>And overextending things, could a playlist format like this be used to
> >>combine visuals (e.g. PPT slides or handwriting) in sync with the
> >>audio track?  Or this is all covered by SMIL, which I sorta'
> >>understand since it's just XML after all, and not relevant to the
> >>current topic?

As I understand things re SMIL, the earlier specs allows you to cite 
a timed text file, but didn't define a format for it. So people I guess
used whatever RealPlayer etc understood. There's now a W3C Working Group
on this topic, defining a Timed Text format. See
http://www.w3.org/AudioVideo/TT/ and nearby...
-> http://www.w3.org/TR/2005/WD-ttaf1-dfxp-20050321/
(the name I find a littly cryptic...)

What would be nice, of course, is an opensource player. I'm not aware of 
one but haven't had a good look...


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