Apple Compressor (4.1.2) - Manual (Page 108)

Glossary 108
Setting In Compressor, a group of properties that are used to transcode a source media file. Each
setting contains the following properties (which you can modify in the Inspector pane):
•
A transcoding format that converts your source media file. 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 effects that modify different characteristics of your video or audio to maximize
the quality of the output file.
Source media file In Compressor, the original media file to be converted to a new file format.
One source file is required for each job.
Transcoding The process of converting files from their original format to a different format.
Closely related terms include compression, which specifically 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 effectively 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 file format most commonly used for storing uncompressed linear
pulse code modulation (LPCM) audio data.
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