Re: Media types and rss (was Re: Using dc:language vs language)

Hey Ralph,

On 6/11/07, Ralph Giles <[email protected]> wrote:
>
> On Fri, Jun 08, 2007 at 01:49:26AM -0700, Charles Iliya Krempeaux wrote:
>
>  > It was that XSPF lacked a method of specifying "how" things were downloaded.
>  >
>  > Whether software could pre-fetch the video file (or audio file).
>  >
>  > Or if software needed to wait until the last minute to download the
>  > video file (or audio file).
>
>  Can you be more specific? Surely that depends on the file size and the
>  client's circumstances as much as the author's intent. Are you thinking
>  about static files vs. streams?

Well.. one easy use case is this....

Consider a video that is made of up 2 video clips.  We'll call them...

* Clip A
* Clip B

Let's say "Clip A" is hockey game from last weekend.  And let's say
"Clip B" is a post roll ad -- an ad shown at the end of the "video".

Since "Clip A" is static and unchanging, the user agent can pre-fetch
is whenever it wants.  And, in fact, would be encouraged (somehow) to
do so.  (This is what you see user agents currently doing with the RSS
<enclosure>.)

"Clip B", however, is different.  Since it is an ad.. and the ad shown
changes all the time... you can NOT pre-fetch the ad.  You need to
wait until the last minute to download the ad.

So... you need at least 2 different semantic concepts.  You need to be
able to specify that some video clips can be pre-fetched whenever and
as early as the user agent wants.  And for some video clips you need
to wait until the last minute before downloading them.


See ya

-- 
    Charles Iliya Krempeaux, B.Sc. <http://ChangeLog.ca/>


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