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Appendix A — General Registry Settings
79
The IBM Video Registry Table
Non-linear quan-
tization flag
NonLinear-
Quant
Long
0 = Off
1 = On
Default: 0
Turns on/off the non-
linear quantizer table.
Use “1” especially
for low bit rates.
Concealment
vector flag
Conceal-
mentVector
Long
0 = Off
1 = On
Default: 0
Turn On to embed
concealment
vectors in the
stream. Useful in
noisy transmission
environments.
DC Precision
DCPrecision
Unsigned char
SIF: 8
MPEG-2: 9, 10, or
11.
Default: 10
Number of bits used
to represent the DC
coefficients for Intra-
coded portions of
pictures. See note
(1) below.
Alternate
co-efficient table
IntraTable
Unsigned char
0 = Off
1 = On
Default: 0
A setting of 1
enables the alternate
coefficient table,
appropriate for
MPEG-2 encodes.
See note (2)
Aspect Ratio
AspectRatio
Unsigned char
1 = Square
2 = 4x3
3 = 16x9
4 = 2.21x1
Indicates aspect ratio
of material being
encoded.
VBR Flag
VBRFlag
Unsigned char
0 = No VBR
1 = VBR Active
Default = 0
Turns variable-
bit-rate on or off.
See note (5).
Average VBR Bit
Rate
VBRAvgBi-
tRate
Unsigned long
4:2:2
— Up to
50,000,000
4:2:0
— 500,000
to 15,000,000
Value must be less
than the video
setting. See note (5).
IBM Video Registry Table (Continued)
Property
Registry Key
Data Type
Value Set
Comments
Table A-1. IBM Video Registry Table (Continued)