Understanding Typical Workflows; Photojpeg; Dv (Dv25); Dv50 - AJA KONA LHI Installation And Operation Manual

Understanding Typical Workflows

PhotoJPEG

DV (DV25)

DV50

DVCPRO HD

KONA LHi Installation and Operation Guide — Understanding Typical
KONA LHi allows more workflow flexibility than ever before. Users can independently
select different formats for capture and storage media, while also outputting to an array
of analog and digital uncompressed formats—with all outputs active simultaneously.
Capture can range from analog, DV, or SD and HD digital uncompressed. Media can be
stored on disk as:
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offline quality at low bit rates
• on-line quality at moderate bit rates
•
or with the highest quality as 8 or 10 bit uncompressed SD and HD
As quality and codecs improve, the lines between offline and online are blurring. For
example, with the Apple ProRes 422 codec, native HD editing in that codec is now
possible, providing very high quality results (true HD editing) at very low data rates.
Following are summaries of the most common codecs used in various workflows,
providing data rates and relative quality levels. Some workflows require a RAID array and
some will work using the host computer's internal system drive (as noted where
supported).
Data rate: approximately 1-3 MB/second (megabyte per second) standard definition or
high definition—supported by internal system drive
Quality: Very Good
The PhotoJPEG codec offers excellent compressed media for near on-line quality at low
data rates. PhotoJPEG can use full-raster 4:2:2 sampling. KONA LHi allows PhotoJPEG
monitoring and output in both SD and HD and can capture from almost any HD or SD
input, directly to PhotoJPEG media.
Data rate: 3+ MB/second standard definition only—supported by internal system drive
Quality: Good
DV is commonly input to an Apple computer via FireWire. KONA LHi can capture directly
to DV compressed media from an uncompressed SDI source. For devices without FireWire
(IEEE1394 or i.Link) connections, this allows the user to capture to this low data rate/
good-quality codec. While DV does offer good quality, it has lower chroma resolution
compared to DV50, JPEG, or uncompressed. The KONA LHi can convert DV projects to
Uncompressed, in real time, for monitoring and output even if the footage is not
captured using the KONA LHi.
Data rate: 6+ MB/second standard definition only—supported by internal system drive
Quality: Very Good
Panasonic DV50 standard definition codec. DV50 is a 4:2:2 compressed format and has
higher chroma resolution than DV25. As with DV25, KONA LHi can convert DV50 projects
to uncompressed, in real time, for monitoring and output. KONA LHi can capture from its
SDI input, directly to DV50 compression.
Data rate: 6 to 14 MB/second high definition—supported by internal system drive
Quality: Excellent
KONA LHi has hardware support for capture from HD-SDI to the DVCPRO HD codec.
KONA hardware also takes some of the DVCPRO HD codec processing load off the CPU,
allowing more computer processor time for Dynamic RT.
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