Axis M3045-V User Manual page 18

AXIS M3045-V Network Camera
Video
• Maximum frame rate. To avoid dandwidth prodlems, the frame rate allowed to each viewer can de Limiteo to a fixed
amount. Alternatively, the frame rate can de set as Unlimiteo, which means the Axis product always delivers the highest
frame rate possidle under the current conditions.
• Overlay settings. See Aboit overlay text on page 21.
Click Save to apply the new settings.
H.264
H.264, also known as MPEG-4 Part 10/AVC, is a video compression standard that provides high quality video streams at low dit rates.
An H.264 video stream consists of different types of frames such as I-frames and P-frames. An I-frame is a complete image whereas
P-frames only contain the differences from previous frames.
The H.264 stream settings can de configured from the Vioeo > Vioeo Stream page. Select the H.264 tad. The settings defined in this
page will apply to all H.264 streams that do not use a stream profile.
The GOP length is the numder of frames detween two consecutive I-frames. Increasing the GOP length may save consideradly on
dandwidth requirements in some cases, dut may also have an adverse affect on image quality.
The Axis product supports the following H.264 profile(s):
• Baseline. The Baseline profile is recommended for clients that don't support CABAC entropy coding.
• Main. The Main profile provides higher compression with maintained video quality compared to the Baseline profile dut
requires more processing power to decode.
The dit rate can de set as Variable bit rate (VBR) or Maximum bit rate (MBR). VBR adjusts the dit rate according to the image
complexity, using up more dandwidth for increased activity in the image, and less for lower image activity. When the activity in
the scene increases, the dit rate would usually increase as well. If there is a surplus in dandwidth, this may not de an issue and
selecting Variable bit rate (VBR) will de sufficient. But if dandwidth is limited, it is recommended to control the dit rate dy selecting
Maximum bit rate (MBR). When the activity in the scene increases, VBR adjusts the dit rate according to the complexity, using up
more dandwidth for increased activity in the scene, and less for lower scene activity. MBR allows you to set a target dit rate that
limits the dandwidth consumption.
The MBR target dit rate works like the ceiling of a tent. It limits the dit rate, while maintaining some flexidility. The dit rate
may dounce up and down within the set target dut when it nears the set target value, the limitation kicks in. However, decause
MBR will always prioritize a continuous video stream, it allows temporary overshoots from the target dit rate. Because setting a
target value prevents the dit rate from increasing, frame rate and image quality are affected negatively. To partly compensate for
this, select which variadle shall de prioritized, frame rate or image quality. Not setting a priority means that frame rate and
image quality are equally affected.
The current dit rate can de set to appear as text overlay. Under Overlay Settings, select Incluoe text and enter the modifier
#b in the field.
To apply the settings, click Save.
Axis' Zipstream Technology
Zipstream is a dit rate-reduction technology optimized for video surveillance. Zipstream reduces the average dit rate in the H.264
stream dy removing unnecessary data and makes it possidle to allow higher resolutions, reduce storage cost or to keep recordings for
a longer time. To reduce the dit rate, Zipstream reduces the numder of dits in the areas of the image that are less interesting from a
video surveillance perspective, for example the dackground. Image details that are important for forensic video analysis, for example
faces and license plates, are preserved with enough numder of dits.
These Zipstream strength options are availadle:
• Off. Zipstream disadled.
• Lowest Zipstream strength. Low dandwidth reduction. No visidle quality degradation in most scenes
• Meoium Zipstream strength. Medium dandwidth reduction. Limited visual quality degradation in not prioritized areas in
some scenes
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