Authoring, Bitrate, Bitrate, constant – Grass Valley ProCoder 3 User Manual
Page 198: Bitrate, 2-pass variable, Codec
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ProCoder 3
Authoring
Refers to the process of taking your converted video files and creating a DVD,
VideoCD or Super VideoCD using a authoring software package. Authoring software
lets you do things like add chapters or menus to your disc and allows it to be played
on many set-top players or computers. Examples of authoring software include
Adobe Encore DVD, Ulead DVD Workshop, Roxio Easy CD Creator and Nero Burning
ROM.
AVI
Short for Audio Video Interleave, an early video format developed by Microsoft for
playback on Windows-based computers. AVI has been officially replaced by Windows
Media Video but is still a popular format for both DV and Disk media.
Bitrate
The measurement of the number of data bits per second in a file. Eight bits form one
byte. Video files are normally measured in thousands of bits, or kilobits per second
(kbps). The higher the bitrate, the larger the resulting file for a specified amount of
time. Generally, the higher the bitrate, the better the quality of the video.
Bitrate, Constant
A video encoding mode where each frame of video is encoded with a constant
number of bits. There can be some variation in particular frames, but the overall
average bitrate remains the same over a given time period. Constant bitrate video is
generally easier to play back than variable bitrate video because it provides a constant
flow of data.
Bitrate, 2-pass Variable
A video encoding mode where two passes are performed on the video. The first pass
analyzes the complexity of the video and the second pass encodes the video using
different bitrates depending on the results of the analysis. 2-pass variable bitrate can
produce better-looking video by reserving bits from areas of low complexity for use
in areas of higher complexity.
Codec
Short for compressor/decompressor, a codec is software that compresses video for
storage purposes and then decompresses it for playback purposes. Codecs vary in
quality - some are good for Web video while others are better for broadcast-quality
video.