AXIS F41 Main Unit
Video and Audio
2. To increase or decrease the number of frames per GOP, set the
GOP length
.
3. Select one of the H.264 profiles.
4. Select on of the following:
-
Variable bit rate
-
Maximum bit rate
5. If you select
Maximum bit rate
, select which variable to prioritize in the
Priority
drop-down list.
6. Click
Save
.
How to include current bitrate in a text overlay
1. Go to
Video & Audio > Video Stream > Overlay Settings
.
2. In the
Include text
field enter #b.
3. Click
Save
.
About Zipstream
Axis’ Zipstream Technology is a bitrate reduction technology optimized for video surveillance. Zipstream reduces the average bitrate
in the H.264 stream by removing unnecessary data and makes it possible to allow higher resolutions, reduce storage cost or
to keep recordings for a longer time.
To reduce the bitrate, Zipstream reduces the number of bits in the areas of the image that are less interesting from a video
surveillance perspective, for example the background. Image details that are important for forensic video analysis, for example faces
and license plates, are preserved with enough number of bits.
Axis’ Zipstream Technology for H.264 conforms to the H.264 standard and is compatible with third-party clients and VMS solutions
that decode H.264 video.
Recommended use of bitrate reduction
Zipstream offers a number of bitrate reduction presets, from Low to Extreme.
Low
bitrate reduction is enabled by default and is
safe to use in all applications while still reducing the bitrate.
For cloud-connected cameras or cameras using edge storage that need to limit the bitrate for increased storage time it is
recommended to select the
Extreme
bitrate reduction. This setting is suitable to combine with motion detection triggering and
variable bitrate (VBR) where the bitrate is allowed to adapt to changes in complexity in the scene.
How to save bandwidth and storage using Zipstream
The bitrate controller built into the product can be combined with Zipstream to ensure a maximum bitrate (MBR) limit. We
recommend using VBR or MBR with a high bitrate limit to enable the full potential of Zipstream. For instance in railway surveillance
where at times there is a lot of movement in the scene and where it is important to capture details, such as facial features, the MBR
should be set to 10Mbit/s (for 1080p resolution at 30 fps).
To further save bandwidth go to
Setup
>
Video & Audio
>
Video Stream
and do one or more of the following:
•
Go to the
Image
tab and set a low
Maximum frame rate
value.
•
Go to the
H.264
tab and set a high
GOP length
value.
•
Go to the
Zipstream
tab and select
Extreme
H.264 bitrate reduction.
•
Go to the
Zipstream
tab. Enable
Dynamic GOP
and set a high
Max dynamic GOP length
value.
•
Go to the
Zipstream
tab and enable
Dynamic FPS
.
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