4.1

Glossary 108
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Apple ProRes 4444: This codec oers the best quality for 4:4:4:4 sources and for workows
involving alpha channels. It features:
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Full-resolution, mastering-quality 4:4:4:4 RGBA color, perceptually indistinguishable from the
original material with excellent multigeneration performance
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A mathematically lossless alpha channel (up to 16 bits) with real-time playback
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A high-quality solution for storing and exchanging motion graphics and composites
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A remarkably low data rate compared to uncompressed 4:4:4 HD (with a target data rate of
approximately 330 Mbps for 4:4:4 sources at 1920 x 1080 and 29.97 fps)
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Direct encoding of, and decoding to, both RGB and Y'CbCr pixel formats
Anamorphic Some video camcorders and recording devices shoot at a widescreen 16:9 aspect
ratio but record the data using a 4:3 aspect ratio. Sometimes the metadata specifying 16:9
playback in the video le is missing or set incorrectly. In Compressor, you can manually adjust
the aspect ratio so that video plays correctly with a widescreen 16:9 aspect ratio. (Note that this
option applies only to standard-denition formats.)
Aspect ratio A lm or video frame’s width-to-height ratio on any viewing screen. Standard-
denition (SD) video (used for regular television screens) has an aspect ratio of 4:3. High-
denition (HD) video has an aspect ratio of 16:9.
AVCHD A high-denition (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 le. However, higher bit rates
require larger le sizes.
CAF (Core Audio Format) Apple’s Core Audio Format is a exible le format for storing and
manipulating digital audio data. CAF provides high performance and exibility, 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 dierent, 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.
Destination In Compressor, a group of one or more transcode settings plus a post-transcoding
action. If you use a destination to transcode a le, one or more new les are created to the
setting’s specications, and then an action is automatically performed on the transcoded le. For
example, the Facebook destination outputs the source le using the HD 720p QuickTime setting,
creating a le optimized for viewing on the web and on mobile devices such as iPad and iPhone.
After the le is processed, the Publish to Facebook action automatically posts the output le to
your Facebook account.
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