COP-USA SDDVR-WF - Manual (Page 18)

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the increasing frame rate will make the image display smoother and stream rate increasing. Conversely,
the image will become discontinuous and stream rate decrease.
¾ I Frame Inv
It means the number of frame P or frame B between key frames (frame I). Generally, the default
value of this parameter is 25 and does not need to be changed. When the stream rate is settled, the
increasing of this value will make the quality of video better. When the video keep the same quality,
this value increasing will make stream rate increased. Conversely, the stream rate will decrease.
¾ Rate Type
when the VBR(Variable Bit rate) is chose, the front end will automatically choose a proper stream
according to the complex and movement condition of images and the image quality set by user, but the
“Bit Rate” will not exceed. When the CBR (Constant Bit rate) is chose, the front end will control the
“Bit Rate” in the setting.
¾ Image Quality
It is an important parameter which controls image quality; this parameter is valid when the “Rate
Type” is set as VBR (Variable Bit rate).
¾ Definition
Definition controls the sharpness of image, setting with 4 levels: 1 for lowest, 4 for highest. When
the video keep the same quality, the higher the definition is, the higher the stream rate will be,
conversely, the stream rate will decrease. When the stream rate is constant as a low value, the higher
the definition is, the lower the image quality will be. When the stream rate is a high value, the higher
the definition is, the better the image quality will be.
To sum up, please refer to our reference value for various conditions and the information giving
above to adjust the image setting. You can make adjusting according to the above description if the
quality of video is not satisfied.
reference
setting
attribute
frame
rate
rate type
image
quality
Bit rate resolution
CBR(Constant
Bit rate)
CBR(Constant
Bit rate)
25
CBR(Constant
Bit rate)
invalid
set according
condition
set according
condition
LAN
VBR(Variable
Bit rate)
25
VBR(Variable
Bit rate)
best unlimited
set
according
condition
ADSL-
upload 512k
CBR(Constant
Bit rate)
12
CBR(Constant
Bit rate)
invalid 384k D1
ADSL-upload CBR(Constant 12 CBR(Constant invalid 512k D1