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Variable bitrate allows the bandwidth consumption to vary depending on the level of activity in the scene. The
more activity, the more bandwidth you need. With variable bitrate you are guaranteed constant image quality,
but you need to make sure you have storage margins.
Maximum bitrate (MBR)
Maximum bitrate lets you set a target bitrate to handle bitrate limitations in your system. You might see a
decline in image quality or frame rate as the instantaneous bitrate is kept below the specified target bitrate. You
can choose to prioritize either image quality or frame rate. We recommend that you configure the target bitrate
to a higher value than the expected bitrate. This gives you a margin in case there is a high level of activity in the
scene.
1 Target bitrate
Average bitrate (ABR)
With average bitrate, the bitrate is automatically adjusted over a longer period of time. This is so you can meet
the specified target and provide the best video quality based on your available storage. Bitrate is higher in
scenes with a lot of activity, compared to static scenes. You are more likely to get better image quality when in
scenes with a lot of activity if you use the average bitrate option. You can define the total storage required to
store the video stream for a specified amount of time (retention time) when image quality is adjusted to meet
the specified target bitrate. Specify the average bitrate settings in one of the following ways:
• To calculate the estimated storage need, set the target bitrate and the retention time.
• To calculate the average bitrate, based on available storage and required retention time, use the target
bitrate calculator.
AXIS Q8752-E Mk II Bispectral PTZ Network Camera
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