6
Apple ProRes 422
and Apple ProRes
422 HQ
(SD or HD)
Data rate:
Approxi
m
ately 18 MB/second ProRes 422, Approxi
m
ately 31 MB/second ProRes 422
HQ— supported by internal syste
m
drive or attached storage
Quality:
Excellent, broadcast quality
Captured
m
edia is virtually indistinguishable fro
m
pristine unco
m
pressed sources. Better yet,
ProRes
m
aintains the quality during editing, surviving
m
ultiple encoding/decoding
generations without degradation. It was designed by Apple for editing, rather than as a
trans
m
ission/distribution codec as are
m
ost popular codecs. So
m
e of the advantages include:
•
Full-size 1920-by-1080 and 1280-by-720 HD resolutions.
•
Full-size 720-by-486 and 720-by-576 SD resolutions.
•
4:2:2 chro
m
a sa
m
pling. Provides precise co
m
positing and blending at sharp saturated-
color boundaries.
•
10-bit sa
m
ple depth. Preserves subtle gradients of 10-bit sources (perfect for green-
screen co
m
positing, graphics or color correction) with no visible banding artifacts.
•
I fra
m
e-only encoding. Ensures consistent quality in every fra
m
e and no artifacts fro
m
co
m
plex
m
otion.
•
Variable bit-rate (VBR) encoding. “S
m
art” encoding analyzes the i
m
age and allocates
m
ore bits to co
m
plex fra
m
es.
•
Low data rate require
m
ents
m
ake for
m
ore storage options and require less drive space
to store high quality video.
Uncompressed
8-bit
Data rate:
21 MB/second standard definition, or 100-124 MB/second high definition (see later
“Storage Capacity” chart in Chapter 1 for the various transfer rates per for
m
at)—requires SCSI,
Fibre Channel, or ATA drive array
Quality:
Excellent
The native storage for
m
at for KONA LHe Plus is unco
m
pressed
m
edia which offers the highest
quality available. Capturing in unco
m
pressed results in no co
m
pression artifacts, and video is
sa
m
pled over the full raster at a 4:2:2 rate.
Using unco
m
pressed
m
aintains a higher quality in your project fro
m
capture all the way
through effects rendering. KONA LHe Plus supports capture of unco
m
pressed through any of
its inputs, and unco
m
pressed projects are output to all of its outputs si
m
ultaneously.
Uncompressed
10-bit
Data rate:
28 MB/second standard definition, or 133-166 MB/second high definition—
unco
m
pressed 10-bit requires SCSI, Fibre Channel or SATA drive arrays.
Quality:
Excellent, very high quality
Offering all the benefits noted previously for 8-bit unco
m
pressed, 10-bit additionally offers
the very highest quality available. With 10-bit
m
edia video quality is second to none. For
m
ore
infor
m
ation on this subject, please see the topic at the end of Chapter 4:
Installation and
Configuration
, titled “Using 8-bit Versus 10-bit Video.'
System Requirements
AJA Video reco
mm
ends that your syste
m
m
eet
m
ini
m
u
m
hardware and software
require
m
ents to achieve a satisfactory level of perfor
m
ance when operating it. Syste
m
require
m
ents are subject to change as new versions of operating syste
m
s, QuickTi
m
e, and
workstations beco
m
e available. For the
m
ost up-to-date Mini
m
u
m
Syste
m
Require
m
ents see
“Installation Overview” on page 11
USO
RESTRITO
