Axis P39 Series User Manual page 21

AXIS P39 Network Camera Series
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The Stream tab contains settings for video streams. You get these settings if you request a video stream from the product and don't
specify for example resolution, or frame rate. When you change the settings in the Stream tab, it doesn't affect ongoing streams, but
it will take effect when you start a new stream.
The Stream profiles settings override the settings from the Stream tab. If you request a stream with a specific stream profile, the
stream contains the settings of that profile. If you request a stream without specifying a stream profile, or request a stream profile
that doesn't exist in the product, the stream contains the settings from the Stream tab.
Bitrate control
With bitrate control, you can manage the bandwidth consumption of your video stream.
Variable bitrate (VBR)
With variable bitrate, the bandwidth consumption varies based on the level of activity in the scene. The more activity in the scene,
the more bandwidth you need. You are guaranteed constant image quality but it requires storage margins.
Maximum bitrate (MBR)
With maximum bitrate, you can set a target bitrate to handle bitrate limitations in your system. You may see a decline in image
quality or frame rate when the instantaneous bitrate is kept below the specified target bitrate. You can choose to either prioritize
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 for additional complexity that needs to be captured.
1 Target bitrate
Average bitrate (ABR)
With average bitrate, the bitrate is automatically adjusted over a longer timescale. 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 needed when using 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:
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