Apple Final Cut Pro X (10.1.2) - Manual (Page 477)

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4:3 The aspect ratio for standard-definition (SD) broadcast video. The ratio of the width to the
height of the visible area of the video frame is 4:3, or 1.33. See also standard-definition (SD).
16:9 A widescreen aspect ratio for video. The ratio of the width to the height of the visible area
of the video frame is 16:9, or 1.78. The 16:9 aspect ratio is used for high-definition video. See also
high-definition (HD).
AAC (Advanced Audio Coding) Also called MPEG-4 Audio. A standard way of compressing and
encoding digital audio. AAC-encoded files rival the quality of audio CDs and generally sound as
good as or better than MP3 files encoded at the same or even a higher bit rate.
AC3 (Audio Codec 3, Advanced Codec 3, Acoustic Coder 3) A Dolby Digital compressed audio
format often used for encoding surround sound.
AIFF (Audio Interchange File Format) A cross-platform audio file format developed by Apple.
Like WAV files, AIFF files contain “chunks” of information such as the Sound Data Chunk, which
contains the actual sample data, and the Common Chunk, which contains sample rate and bit
depth information.
alpha channel An image channel in addition to the R, G, and B color channels that is used
to store transparency information for compositing. Alpha channels are often 8-bit, but some
applications support 16-bit alpha channels. In Final Cut Pro, black represents 100 percent
transparency, and white represents 100 percent opacity. Only certain formats, such as Targa, TIFF,
PNG, PSD, Apple ProRes 4444, and the QuickTime Animation codec, support alpha channels. See
also compositing, RGB.
Angle Editor You can open multicam clips in the Angle Editor to adjust the synchronization and
the angle order, or to add or delete angles. You can also use the Angle Editor to make edits to
the individual clips inside a multicam clip (such as trimming, making color corrections, adding
transitions, and so on). See also multicam clip.
Angle Viewer A viewer used to watch all angles of a multicam clip simultaneously while
switching or cutting to different angles in real time. You can cut and switch video and audio
at the same time or independently. For example, you can use the audio from angle 1 while
switching the video between angles 1 to 4. See also multicam clip.
Animation Editors See Audio Animation Editor, Video Animation Editor.
Apple ProRes Apple codecs that provide an unparalleled combination of multistream, real-
time editing performance, impressive image quality, and reduced storage rates. Apple ProRes
codecs take full advantage of multicore processing and feature fast, reduced-resolution decoding
modes. All Apple ProRes codecs support any frame size (including SD, HD, 2K, and 4K) at full
resolution. The data rates vary based on codec type, image content, frame size, and frame rate.
Glossary
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