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Learning VirtualDub: The Complete Guide to Capturing, Processing and Encoding Digital Video by Georgios Diamantopoulos, Sohail Salehi

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Compressing Video

This section will guide you through the steps of compressing video using the basic settings. You will also be introduced to some of the concepts used in modern codecs (such as DivX) so that you are better equipped to configure those to your needs. We will also touch on the issues of interoperability we mentioned earlier, but this time on a lower and more specific level.

The public interface that the operating system exposes to applications like VirtualDub is Video for Windows. This offers a simplistic way of defining the codec options before you encode a video. That is, it allows you to specify:

  • A quality factor (0 to 100)
  • The data rate in kilobytes/sec
  • The maximum interval that the stream will not contain a key-frame

There are two ...

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