O'Reilly logo

QuickTime for Java: A Developer's Notebook by Chris Adamson

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 8. Video Media

It probably seems like half of this book has already been about video—I’ve assumed you had video media for the chapters on playback, editing, and components (Chapter 2 and Chapter 4), even though the material there would be perfectly well suited for use on audio-only media like MP3 files. Well, this chapter is only about video, showing a handful of useful tricks for working with video.

Because video is simply a progression of images, alternated quickly enough to suggest movement, you probably won’t be too surprised to know that the material covered in the QuickDraw graphics chapter (Chapter 5) pays off in this chapter. QuickDraw and QD-like APIs are the means by which you create and/or manipulate video media. If you skipped that chapter and have problems herein with QDGraphics (a.k.a. GWorlds), Matrixes, GraphicsImporters, or compression, you might need to check back there. But I’ll try to keep things fairly self-explanatory.

Combining Video Tracks

It’s not hard to understand how two audio tracks can coexist in a movie—the sounds are mixed and played together. But the idea of combining video tracks is less intuitive.

By default, if you have two video tracks of the same size in a movie, one will totally overlap the other. But you can change the default behavior by specifying 2D transformations with Matrix objects, and the Z-axis ordering by setting “layering” behavior.

One way to play with Matrix-based spatial arrangement is to set up a picture-in-picture

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required