AXIS P1245 Network Camera
About video settings
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, which makes it possible to stream higher resolutions, reduce storage cost
or keep recordings for a longer time.
To reduce the average bitrate, Zipstream reduces the bitrate in 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 encoded with a higher bitrate.
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.
We recommend using the
Extreme
bitrate reduction to maximize storage time for cloud-connected cameras or cameras using edge
storage. 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
>
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
.
Always verify that the video stream meets the quality requirements for your surveillance purposes after changing the video stream
settings.
About MJPEG settings
Sometimes the image size is large due to low light or complex scenery. Adjusting the maximum frame size helps to control the
bandwidth and storage used by the Motion JPEG video stream in these situations. Setting the frame size to the
Default
setting
provides consistently good image quality at the expense of increased bandwidth and storage usage in low light. Limiting the frame
size optimizes bandwidth and storage usage, but may result in poor image quality.
About stream profiles
A stream profile is a set of predefined stream settings including resolution, compression, frame rate and overlay settings. Stream
profiles can be used:
•
When setting up recording using action rules. See
•
When setting up continuous recording. See
About continuous recording on page 30
•
In the Live View page – select the stream profile from the
Stream profile
drop-down list.
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