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Updating Video Playback
3 Updating Routine Order
The Mantis system looks for an update file following a specific
order. It proceeds sequentially through the order until it finds a
matching file and then proceeds to the playlist parsing routine,
below.
1. siteid.tar
2. firefly.tar
3. siteid.fpl
4. firefly.fpl
5. siteid.fsc
6. firefly.fsc
7. *.tar
8. *.fpl
Use of the filename convention described earlier, permits the
creation of a single disc that can work for multiple Mantis players.
Using individual site IDs in the filenames, it is possible to have all
of the media files and update packets multiple Mantis players.
4 Playlist Parsing Routine
When the Mantis copies a new playlist, it analyzes the list to
determine which MPEG video files it needs. The Mantis then
checks its own storage to determine if any of these videos are
already present. Any files that are not present already present and
up to date, are copied from the CD/DVD.
For a preexisting file, the Mantis compares its file size against a
file with the same name located on the CD/DVD. Only if the file
on the disc has a different file size, does the Mantis copy it and
overwrite the pre-existing file.
File Size Criteria
File size is a more reliable indicator than creation date or other
conventional means and is used to determine if two files are the
same. This is because it is extremely unlikely that two MPEG files
with similar but not identical (i.e. edited) content would be exactly
the same size.
Once all of the required video files are copied from the disc, the
Mantis begins playing the new playlist or schedule.
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