Inside Macintosh: QuickTime Reference
| Previous | Chapter Contents | Chapter Top | Next |
The SMIL importer creates a movie media track for each media element in the SMIL composition. This is done primarily to accommodate the potentially unknown spatial layout of each element. Because a track can only have one location and size, if multiple media elements were combined in a single track the track would need to be resized and moved at runtime with much greater frequency than if each element is in its own track.
The SMIL importer always creates a single video track which uses a solid color fill based on the background color specified in the SMIL document. This track exists for the entire duration of the SMIL composition, though it may or may not be visible depending on the overall layout.
Inside Macintosh: QuickTime Reference
| Previous | Chapter Contents | Chapter Top | Next |