SLAMorris Final Thesis After Corrections.pdf - Cranfield University

6.9.2 Media thumbnails
In Windows 7, multimedia (media) thumbnails have a common structure, which
can be seen in figure 6.16. The film strip border on the visual thumbnail
identifies the file as having a media thumbnail. The media thumbnail preview of
the file can be accessed when the file is selected in the file browser (figure
6.17). As with audio thumbnails, upon selection of the file, the media thumbnail
can be seen in the preview pane. If the file is deselected, the media thumbnail
will cease to play; should the file be reselected, the media thumbnail can only
be replayed from the beginning.
An experiment was performed using a set of 10 media files copied into the
current “My Documents” directory of a virtual machine. Each of the media
thumbnails was accessed; the first media thumbnail was accessed for 10
seconds, with each subsequent media thumbnail adding a further 10 seconds to
the access time. The results have shown that the media thumbnails are created
at runtime and are therefore not store on the system. However as with audio
thumbnails, the visual thumbnail is stored in the cache.
Figure 6-16: The structure of a media thumbnail
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