Real Pix Files
December 14, 1998
You may have been wondering what exactly a RealPix file is.
We'll don't worry, its really a JPG file that has been specially
encoded. The encoding is done using a program called
JPEGTRAN,
which is available for both Mac and PC. Let's look at the RealPix file:
<imfl>
<head
width = "160"
height = "120"
start = "0"
duration = "20"
timeformat = "dd:hh:mm:ss.xyz"
bitrate = "12000"
url = "http://www.wdvl.com"/>
<image handle = "1"
name = "headline1.jpg"/>
<image handle = "2"
name = "headline2.jpg"/>
<image handle = "3"
name = "headline3.jpg"/>
<wipe type = "push"
direction = "right"
start = "1"
duration = "2"
target = "1"/>
<wipe type = "push"
direction = "right"
start = "8"
duration = "2"
target = "2"/>
<wipe type = "push"
direction = "left"
start = "13"
duration = "2"
target = "3"/>
</imfl>
The whole RealPix file is contained between opening and closing
<IMFL> tags.
The Real Pix file defines two things: the individual picture files
(in this case JPG files) and the time points and manner in which
they progress through their "slideshow".
The HEAD
area defines some simple info such as width, height, start time,
total duration, the timeformat, the bitrate at which the pix
should be streamed and the URL to go to if a picture is clicked on.
The individual pictures are defined next. Let's take a look at one
of them:
<image handle = "1"
name = "headline1.jpg"/>
The first image is given a "handle" which is its ID.
Its source is also defined as the JPG image headline1.jpg.
Below this definitions are given for how the "slideshow"
should be presented. I'll walk you through it in plain English.
The first image slides in (push) from the right side of its
region one second into the presentation. The slide lasts two
seconds. This image stays in place until eight seconds into
the presentation where it is replaced by image two, which slides
in from the right to cover the first image. The final image,
headline3.jpg, slides in from the left at 13 seconds to cover image 2.
This final image stays until the end of the presentation.
More images can be added to the series and many different wipes are
available.
SMIL File
Introduction to SMIL
Real Text
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