Apple Compressor (4.1.2) - Manual (Page 105)

Glossary 105
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Apple ProRes 422 HQ: A higher-data-rate version of Apple ProRes 422 that preserves visual
quality at the same high level as Apple ProRes 4444, but for 4:2:2 image sources. With
widespread adoption across the video post-production industry, Apple ProRes 422 HQ offers
visually lossless preservation of the highest-quality professional HD video that a single-
link HD-SDI signal can carry. This codec supports full-width, 4:2:2 video sources at 10-bit
pixel depths, while remaining visually lossless through many generations of decoding and
reencoding. The target data rate of Apple ProRes 422 HQ is approximately 220 Mbps at 1920 x
1080 and 29.97 fps.
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Apple ProRes 422: A high-quality compressed codec offering nearly all the benefits of
Apple ProRes 422 HQ, but at 66 percent of the data rate for even better multistream, real-time
editing performance. The target data rate of Apple ProRes 422 is approximately 147 Mbps at
1920 x 1080 and 29.97 fps.
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Apple ProRes 422 LT: A more highly compressed codec than Apple ProRes 422, with roughly
70 percent of the data rate and 30 percent smaller file sizes. This codec is perfect for
environments where storage capacity and data rate are at a premium. The target data rate of
Apple ProRes 422 LT is approximately 102 Mbps at 1920 x 1080 and 29.97 fps.
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Apple ProRes 422 Proxy: An even more highly compressed codec than Apple ProRes 422 LT,
intended for use in offline workflows that require low data rates but full-resolution video.
The target data rate of Apple ProRes 422 Proxy is approximately 45 Mbps at 1920 x 1080 and
29.97 fps.
Note: Apple ProRes 4444 and Apple ProRes 4444 XQ are ideal for the exchange of motion
graphics media because they are virtually lossless, and are the only Apple ProRes codecs that
support alpha channels.
Aspect ratio A film or video frame’s width-to-height ratio on any viewing screen. Standard-
definition (SD) video (used for regular television screens) has an aspect ratio of 4:3. High-
definition (HD) video has an aspect ratio of 16:9.
AVCHD A high-definition (HD) video format that uses Advanced Video Coding (AVC)
compression (also known as MPEG-4 part 10 or H.264). Many Blu-ray players can play red laser
discs with AVCHD format content, making this a common way to distribute short HD video
projects using a standard red laser disc.
Batch In Compressor, one or more jobs to be processed. All jobs contained within the batch
(shown in the batch area of Compressor window) are submitted collectively when you begin the
transcoding process.
Bit rate The number of bits per second in the transmission of a digital video or audio signal.
The higher you set the bit rate, the better the quality of the output file. However, higher bit rates
require larger file sizes.
CAF (Core Audio Format) Apple’s Core Audio Format is a flexible file format for storing and
manipulating digital audio data. CAF provides high performance and flexibility, and is scalable to
future ultra high-resolution audio recording, editing, and playback.
Codec Short for COmpression/DECompression. A software component used to translate video
or audio from its current form to a different, digitally compressed form. A codec encodes a data
stream or signal for transmission, storage or encryption, or decodes it for playback or editing. A
similar term, encoder, is used to describe hardware that performs the same activity.
67% resize factor