COP-USA SDDVR-WF - Manual (Page 17)

15
¾ ᇹBit Rateᇺ“Bit Rate” means the amount of stream bit encoding by encoder in a second, the unit
of stream rate is bps, namely bits per second. The range of stream rate is from 16k to 4096k, please
note that the unit k means 1000, for example 4096k means 4096000bps, the encoder will use
4096000bps stream rate to encode video.
For more details of setting of the above part please refer to the following “Advanced image
setting skill”
3.1.3. Advanced image setting skill
   Image setting is an important part in the server setting because it will affect the system ability, it has
close relationship with the video quality and network ability. The aim of image setting is to make it
conveniently suitable for various networks.
Bit stream and frame rate settings are providing in system, but it is hard to suit various networks
with only several default values. Consequently, some advanced settings are provided for user to ensure
the video quality while utilizing network effectively.
The image settings including ᇹ Bit Rate ᇺ , ᇹ Frame Rate ᇺ , ᇹ I Frame Inv ᇺ , ᇹ Rate type ᇺ , ᇹ Image
Quality ᇺ and ᇹ Definition ᇺ are what we concern about.
Now we will introduce meaning, effect to other settings and network ability of each setting
respectively.

¾ Bit Rate
It means the size of stream bit encoding by encoder per second. The unit is bit per second. This
setting is the main factor affects the bandwidth of network and other settings. The bandwidth utilizing
will increase when the bit rate increase. Thus CBR (Constant Bit rate) setting according to the
bandwidth is suitable for the network bandwidth limitation situations. In the same quality situation, bit
rate will be affected by settings including frame rate, I frame Inv, rate type, image quality, and
definition. Please refer to following introduction for details. This parameter is valid when the “Rate
Type” is set as CBR (Constant Bit rate).
¾ Frame Rate
It means the maximum number of frames that encoder encodes per second, with unit frame per
second. this setting has three functions, firstly the number of frames encoder encoding per second is set
by this setting, secondly when the stream rate is CBR (Constant Bit rate), when the frame rate changed,
for example decreased, because the encoder need to keep the current code stream setting, thus it will
enhance the frame quality according to the current code stream setting. It means, when the code stream
is VBR (Variable Bit rate), the decreasing of frame rate will enhance the quality of video and keep the
same frame rate value. The video quality will reduce conversely. Thirdly, when the same quality is kept,