
As the screen shot shows, this vog has the six sound tracks layered into this movie. Unlike the first two iterations, where the soundtracks are loaded as child movies, here they are all copresent in the movie. The differences?
Well, filesize for starters. Port Fairy 2-1 and 2-2 are only 2.6MB in size (they have been lightly compressed so that image quality is high), but now the file is 3.5MB. This is because in Port Fairy 2-1 and 2-2 the soundtracks are external to the movie that is being played, and only loaded dynamically if and when a mouse event calls them. Now, with the soundtracks embedded into the one QuickTime file, they of course require space.
However, only one soundtrack runs for the same duration as the video track, so what this means is that depending on when the user mouses into the movie there may, or may not, be a soundtrack to hear. That is quite literal. It isn’t that the soundtrack has been scripted to a volume of 0, but that at that point in the timeline there is no corresponding soundtrack (as the screen shot indicates). Therefore a disadvantage of authoring like this is that your soundtrack durations must match the video duration if you wish for there to be continuous sound. This also illustrates why using childmovies can be a good idea. Not only does it mean you can write a leaner QuickTime front end to your content, but it also means that your soundtracks can be made to loop and so are available (audible) at any point in the timeline in the video track – their duration and location is completely independent of the parent QuickTime movie. An advantage of integrating all the soundtracks is that there is no lag as you move from one soundtrack to the other, instant on and off.
The point of this particular movie? Simply to move the soundtracks from being child movies to being an integral part of the architecture of the final movie and to literally demonstrate the implications or consequences of this. Unless the silence does a John Cage like thing for you, childmove soundtracks would seem to be a more intelligent model for sound in interactive QuickTime work where you want, for example, multiple commentaries, music, effect, or sound tracks. Oh, and in case this is being misunderstood, in interactive QuickTime vogging the soundtrack changes immediately for whatever scripted structures have been provided for. It is not a DVD model where you view the clip once with soundtrack A, then view the clip again with soundtrack B. This is a different and more sophisticated narratological or videological (what I call elsewhere softvideo and softvideography) model than what is ordinarily used in environments like DVD.
Tags:
hypertext,
softvideo,
Vogging