Re: W3C and Handle technology

Philipp Hoschka (hoschka@sophia.inria.fr)
21 Aug 1996 18:45:32 GMT


To: sophia-listes-www-html@news-sop.inria.fr
From: hoschka@sophia.inria.fr (Philipp Hoschka )
Subject: Re: W3C and Handle technology
Date: 21 Aug 1996 18:45:32 GMT
Message-ID: <4vflgc$23f@news-sop.inria.fr>

In article <DSTAug13.194814.10653@sophia.inria.fr>, connolly@beach.w3.org ("Daniel W. Connolly") writes:

|> Another question is "how do you express a link from some region of
|> time-space in an MPEG to someplace else in the web?"
|> 
|> There isn't any standardized mechanism to do that, but I can think
|> of some options, among them:
|> 
|> 	Content-Type: multipart/related; boundary="part"
|> 	--part
|> 	Content-Type: video/mpeg
|> 	Content-ID: li3jlsijflisj3e@foo.com
|> 
|> 	ASLDKFJALSJDFK
|> 	--part
|> 	Content-Type: text/html
|> 
|> 	<resource
|> 		 href="cid:li3jlsijflisj3e@foo.com#frames=100-200;x=12;y=20">
|> 		<!-- ^^^ source of link ^^^ -->
|> 	  <link href="http://foo.com/"> <!-- <- destination of link
|> 	</resource>
|> 
|> 	--part
|> 
|> i.e. an associated HTML document that describes the link. I'm sure
|> there are more straightforward ways to represent links than
|> HTML <resource> elements, but they do suffice.

This is ok if the MPEG (or more generally video) file is small enough that
it can be downloaded in reasonable time given a certain network capacity. In
the case of streaming video, there may be two other options:
- download the associated HTML document (or "link file") seperately before
streaming starts.
- open another stream for transmitting link information - this avoids
latency of downloading a big link file before the streaming can start.
Also, it facilitates "tuning into" a running, multicasted transmission.

Moreover, you also need to be able to express movement between frames, 
e.g. a link associated with a plane moving from left to right through
the video screen.

Btw, anyone who knows of public domain code for these sort of things,
please get in touch with me.

-Philipp Hoschka

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