Instruction manual

1
21
KONA LH/LHe Installation and Operation Manual — Understanding Typical
connection so some sort of audio level correction device, such as a mixer or a stand
alone active interface amplifier, should be used for accurately attenuated audio.)
Finally, you will want to control your device. Where all of the video, audio and
timecode information moved over the FireWire cable, now you are dividing those
tasks. Device control is the most difficult to configure for HDV devices because so
few HDV devices have implemented any form of device control other than
IEEE1394. The one notable exception is the JVC BR-HD50 HDV deck which has a
remote serial port for RS422 protocol and device control. Check the KONA LH/
LHe support area on the AJA website for a whitepaper on HDV, which gives details
on using KONA LH/LHe with various HDV equipment.
Note: direct capture into HDV media on the LH/LHe is not possible. Direct
capture into the LH/LHe can only be done using uncompressed, DVCpro HD, or
Pro Res. Regarding ProRes 422, capturing HD resolution ProRes 422 from an HD
source requires either a Mac Pro with an Intel Xeon processor or G5 Quad PCIe
Power Mac. Real-time capture and transcoding of HD to ProRes 422 is not supported
on other models of G5 or G4 Power Mac computers.
Apple ProRes 422
and Apple ProRes
422 HQ
(SD or HD)
Data rate: 145 MB/second ProRes 422, 220 MB/second ProRes 422 HQ—supported
by internal system drive or attached storage
Quality: Excellent, broadcast quality
Captured media is virtually indistinguishable from pristine uncompressed sources.
Better yet, ProRes maintains the quality during editing, surviving multiple encoding/
decoding generations without degradation. It was designed by Apple for editing,
rather than as a transmission/distribution codec as are most popular codecs. Some 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 chroma sampling. Provides precise compositing and blending at sharp
saturated-color boundaries.
• 10-bit sample depth. Preserves subtle gradients of 10-bit sources (perfect for
green-screen compositing, graphics or color correction) with no visible banding
artifacts.
• I frame-only encoding. Ensures consistent quality in every frame and no artifacts
from complex motion.
• Variable bit-rate (VBR) encoding. “Smart” encoding analyzes the image and
allocates more bits to complex frames.
• Low data rate requirements make for more storage options and require less drive
space to store high quality video.