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Video and Audio > Capturing Formats

Capturing Formats

Although the Web doesn’t yet allow for high-bandwidth real-time video, it’s a good idea to capture highquality content anyway. There are several reasons for this:

  • Highly precompressed video cannot be compressed again—at least not with acceptable results. You can use compression algorithms, like Sorenson, that produce stunning quality even for Web use. But these algorithms won’t work well on already-compressed images, and the image quality will deteriorate significantly.

  • Aside from Web publishing, you might want to use your videos for CD-ROMs, high-resolution screen shots, or even your own movie edits that go back to video.

  • You can always scale down a movie file, but you can’t scale it back up without a loss in quality. This is especially important if you want to create several smaller clips designed for different connection speeds (a feature that comes with QuickTime and RealMedia). Scaling means that a visitor to your Web site with a 28 Kbps connection will see a movie with 160 by 120 resolution, while a visitor with a 56 Kbps modem will see a movie with 240 by 180 resolution.

  • Not all compression algorithms work equally well for all purposes. Even with some experience, you might need to test the different output options (algorithms) for your particular project.


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