Header Tag

A RealPix file contains information about how a certain set of images will be displayed in a certain region of your SMIL presentation. In fact, you can think of it as a mini-presentation within your SMIL presentation.

As a result, there are similarities in the structure of SMIL and RealPix files. As you become more familiar with how SMIL and RealPix files work together, you can experiment with overriding the information in the SMIL file by modifying the header information in the RealPix file.

<imfl> Tag

Like SMIL (and HTML) files, all information in a RealPix file is placed between a required opening tag and closing tag. The RealPix file begins with <imfl> and ends with </imfl>.

<imfl>

...contents of file here...

</imfl>

<head/> Tag

The <head/> tag sets the presentation's parameters, such as the duration and streaming bit rate. The <head/> tag ends with a slash. Its required attributes include (see the bottom of the page for an example using these attributes):

width and height
These attributes set the width of the display region in pixels. You should use the same width and height you set in your SMIL file for this region.

timeformat
This attribute sets the format for the start and duration times of RealPix effects. As in other SMIL tags, times are in dd:hh:mm:ss format. Recall that the last field is read as the seconds. For example, 1:30 means 1 minute and 30 seconds, whereas 1:30:00 means 1 hour and 30 minutes and zero seconds.

duration
The duration attribute sets the length of the entire RealPix sequence. All RealPix effects stop immediately when the duration elapses. When the duration time exceeds the time required to complete the effects, the last effect stays frozen in the display region.

bitrate
The bitrate attribute specifies the maximum bandwidth the presentation consumes. Specify the value in bits per second (bps).