Nonlinear desktop video editing systems

Article Abstract:

Nonlinear desktop video editors are approaching broadcast quality. These systems are available for both the PC and Mac, although the Mac dominates the field because of the easy integration of hardware and the predominance of QuickTime technology. Although the process of digitizing and compressing video degrades the original analog presentation, quality is improving rapidly. A high-end nonlinear video editing system can take one of two forms. A capture, compression and playback card may be bundled with editing software, or a complete turnkey system will include capture and compression cards, hard disks, software, and a dedicated computer and monitor. In order to get the best quality, the hardware should be able to capture at as low a compression rate as possible. The data transfer method is also critical. A higher data rate will result in fewer compression artifacts and higher quality video. A complete system needs to have the ability to digitize audio in 16 bits with a 44.1kHz sample rate for professional playback. A directory of available video-editing software is also included.

Video processing equipment

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QuickTime and AVI tools

Article Abstract:

QuickTime and AVI capture cards allow desktop computers to play back video from a CD-ROM or hard disk. Video production starts with the video capture card, which captures the material by sampling the video stream and converting it into digital form. The stream can be captured from tape, video camera or laserdisc player. These cards differ from frame grabbers, which take only one frame and save it as a still image. Most cards capture 15 frames per second in 24-bit color. A higher-end card may be able to support 60 fields per second for a smoother playback. One of the most difficult problems of digital video is compression, since full-motion video consumes an enormous amount of disk space. Codecs are available to remove redundant data, then recreate the video on playback. Some of these codecs require specialized chips to encode the video in real time. On the PC, recording and playback takes place on the sound card, an AV Mac or Power Mac can record and play sound with no extra hardware.

Video capture board

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Compression tips for QuickTime Video: Codecs

Article Abstract:

QuickTime applications provide several codecs for data compression. The None codec simply converts an image's pixel depth, and can convert a 32-bit image to 24-bit with no loss in quality. This codec can be used along with other codecs to extend their functionality. The JPEG codec is best suited to still images and photographs. Users of this codec can choose the amount of lossiness. The lossiness specification will have an impact on the resulting compression ratio. The Animation codec is used for synthetic images such as animation or computer-generated video. It is not well-suited to videotape images because visual noise may corrupt the similarities between frames. The Graphics codec is used for 8-bit still images and sequences, and is often used on slower storage devices. The Apple Video Codec offers fast decompression or digitized video, and the Cinepak codec is useful for compressing 16-bit and 24-bit video. Cinepak is a lossy algorithm and takes longer to compress.

Technology overview, Technology Information

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