Cisco 3005 - VPN Concentrator - Gateway Operation Manual page 29

The advanced compression page gives you control over many of the VC-1 encoding
tools. This is important since, depending on your decoding solution (whether it be a
mobile device, an STB or a PC), you may need to limit or want to expand on the tools
used for encoding. All options have a <default> setting where the actual setting used
internally depends on multiple encoding setup factors, such as encode profile,
resolution and bit rate.
For S3200 Series units, advanced compression options will apply to
both channels.
NOTE:
Dquant Option
Dquant is the difference in the quantizer between the previous macroblock and the
current macroblock. Using this optimization can produce better quality in smooth
areas of the video picture, but increases the computation required to encode each
frame. If this optimization is activated, the strength of optimization is controlled by
the Dquant Strength value.
Setting Value
<default>
Not used
I frames only
I and P frames
I, P, and B frames
Dquant Strength
The Dquant Strength setting specifies the strength of the Dquant perceptual
optimization that will be used. The stronger the optimization, the more CPU-
intensive the encoding will be. This value is used only if the Dquant Option is
enabled.
Setting Value
<default>
Codec-determined
C I SCO S3 0 00 / S 50 0 0 S ER I E S M E D I A PRO C E S SO R S
Function
Default based on encoder settings
Dquant perceptual optimization disabled
Only I frames will be optimized
Only I and P frames will be optimized
I, P, and B frames will be optimized
Function
Default based on encoder settings
Strength of optimization will be determined by the
codec
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