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Table Of Contents
Annex: Digital Video and Data Storage 363
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Annex: Digital Video and Data Storage
Video Editing on the PC
Digital video processing with the PC is comparable to audio processing. The
analog medium that is video must first be digitized before it can be processed
by the computer.
Digital video processing functions quite similar to recording via a sound card.
The signal flow is measured in very short, regular intervals, and the values
resulting from it can then be processed by the computer. The accuracy of each
individual measurement results in the resolution, and the frequency of the
measurements results in the frame rate. The more precise and frequent the
signal is measured, the higher the quality of the digitized video, but also the
higher demands on the capture performance and the required storage space.
The Windows standard format for video files is AVI (audio and video
Interleaved).
Digitizing video adopts either the camera or the graphics card, a TV card (e.g.
Miro PCTV), or a video card (e.g. Fast AV Master). However, video handling
makes much higher demands upon the hardware if good image quality is
required. In order to be able to reasonably process video files on today’s PCs,
they must be compressed. Digital audio, on the other hand only uses
compression for saving storage space.
MPEG Compression
MPEG means "Moving Picture Experts Group" and defines a workgroup which
cooperates with the International Standards Organization (ISO) as well as the
international Electro Technical Commission (ETC) to develop standards for
video and audio coding.
Generally, the graphic data rate of the digital video standard is 167 megabits
per second, which, when not compressed, requires a far higher storage
capacity than a DVD can offer. A one-sided DVD 5 with 4.7 GB storage