4.1

Glossary 111
Setting In Compressor, a group of properties that are used to transcode a source media le. Each
setting contains the following properties (which you can modify in the Inspector pane):
•
A transcoding format that converts your source media le. Choose one of the following formats
based on the intended playback method: AIFF, Dolby Digital Professional, DV Stream, H.264 for
Apple Devices (which contains settings for use with iPad, iPhone, iPod, and Apple TV), Image
Sequence (which supports TIFF and TARGA images), MPEG-1, MPEG-2, MPEG-4, QuickTime
Movie, or QuickTime Export Components.
•
Frame size, pixel aspect ratio, and cropping and padding controls that allow you to crop the
image and adjust its frame size.
•
Video and audio eects that modify dierent characteristics of your video or audio to maximize
the quality of the output le.
Source media le In Compressor, the original media le to be converted to a new le format.
One source le is required for each job.
Transcoding The process of converting les from their original format to a dierent format.
Closely related terms include compression, which specically refers to data reduction, and
encoding, a term that is essentially synonymous with transcoding, but doesn’t emphasize the
conversion aspect.
Uncompressed 8-bit and 10-bit 4:2:2 Video formats used to store 8-bit or 10-bit 4:2:2 Y'CbCr
video without employing data compression. Bypassing compression reduces the computer’s
processing load but increases the data rate considerably. A large-capacity RAID storage system is
typically required to work eectively with uncompressed video. In many cases, Apple ProRes is a
better choice.
The data rate of uncompressed 4:2:2 video varies according to frame size and frame rate. For
example, at a frame size of 1920 x 1080 and a frame rate of 29.97 fps, the data rate is 1.0 Gbps for
uncompressed 8-bit 4:2:2 video and 1.3 Gbps for uncompressed 10-bit 4:2:2 video.
WAVE (or WAV) An audio le format most commonly used for storing uncompressed linear
pulse code modulation (LPCM) audio data.
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