Balter IP-D1231VR Manual page 53

Bitrate Control
Bitrate
VBR – Variable bitrate
When using VBR, you can select a video quality level.
VBR is a video coding method that controls the bitrate corresponding to move-
ments and the amount of detail in a scene.
In a simple scene, for example an empty hallway, a high compression will be
used, the bitrate and the transmitted data will be lower, resulting in less band-
with usage.
In scenes with a high amount of detail and lots of movements the compression
rate will be lowered to achive high image quality.
CBR – Constant bitrate
When using CBR the bitrate will not change and remain at an user-defined
level. This way users can reliably predict the amount of bandwith and storage
space used.
CBR is best used when only a limited bandwidth/storage capacity is available.
The bitrate determines the amount of data that is transmitted in a certain
amount of time. This amount is mostly measured in seconds.
The higher the bitrate, the better the image quality since the image will be
compressed less and more information will be transmitted.
With rising bitrates the amount of storage capacity needed and bandwidth
used also rises.
Choosing a bitrate too high may lead to image freezes in live videos.
When choosing a bitrate, the resolution of the video and framerate should be
taken into consideration.
Please note: If you desire a smooth image without stuttering via internet, do
not select a bitrate that is higher than the upload speed of your internet con-
nection, use SubStream or MobileStream or consider upgrading your internet
connection.
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