Niagara 4100 User Guide
ViewCast 127
Other settings Setting
Explanation
BlurComplexity
Apply a Gaussian blur with the given radius to the quantizer
curve. This value means the quantizer assigned to each frame
is blurred temporally with its neighbors to limit quantizer
fluctuations.
BQuantFactor
This value sets the targets average reduction in bit rate for B-
frames as compared to P-frames. Higher values increase the
quality of B-frames. This value makes them better references,
which can improve the overall image quality. The problem is
that the extra bits taken by the B-frames are taken from the P-
frames, which makes this variable a balancing act.
BQuantOffset
This value is the quantizer scale offset between I-P-B-frames.
ChromaOffset
The encoder normally encodes all 3 color planes (luma, U
(chroma), V (chroma) ) at the same quantizer. The system adds
this value to the quantizers for the U and V planes. This value
allows you to bias the encode in favor of brightness (luma) by
setting positive values (chroma fields will have higher
quantizers), or in favor of color (chroma) by setting negative
values (chroma fields will have lower quantizers).
The encoder only encodes the luma and chroma planes at the
quantizer up to quantizer 29. After this, chroma is
progressively quantized by a lower amount than luma until
you end with luma at quantizer 51. This behavior is not
adjustable, as it is required by the H.264 standard.
ConstantQuantizationRateControl
This value sets the encoder to use Constant Quantization Rate
Control. It keeps the encoding at a constant quantizer and
doesn’t restrict to target a certain bit rate, but rather restricts
to a certain quality no matter what bit rate it needs to use on
each frame to keep quality constant. This value is mostly for
quality encodes, set to -1 to disable this encode mode.
Level
This value sets the level flag in the output bit stream (as
defined by Annex A of the H.264 Standard) permissible levels
include:
1, 1.1, 1.2, 1.3, 2, 2.1, 2.2, 3, 3.1, 3.2, 4, 4.1, 4.2, 5, and 5.1
The encoder does not support level 1b from the specification.
MaxBFramesBetweenNonBFrames
This value sets the maximum number of concurrent B-frames
that can be used. B-frames are similar to P-frames, except they
can use motion prediction from future frames as well. This
value can lead to significantly better efficiency in terms of
compression ratio.
NoiseReduction
This value performs adaptive pseudo-dead zone noise
reduction, estimates film noise based on the value set and
attempts to remove the noise by dropping small details before