Axis Communications Security Camera 215 PTZ User Manual

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AXIS 215 PTZ/AXIS 215 PTZ-E - Setup
14
• Image freeze on PTZ - freeze the image either during pan, tilt, zoom movement or between preset
positions only. Once the camera has reached its position, the current image is shown.
MPEG-4 Settings
The AXIS 215 PTZ/AXIS 215 PTZ-E supports the following
different MPEG-4 profiles and levels:
Level 5 is preferred if there is enough
bandwidth available,
as the image quality of the video stream will be better than
if level 3 is used. The viewing client must support the profile
used for the video stream otherwise the MPEG-4 stream can
not be viewed.
Note:
AXIS Media Control supports all the configuration possibilities
available on this page.
The GOV structure can be set to either I or IP, which describes the type of images included in the video stream,
as well as their internal order. The IP-structure generally sends the differences compared to the previous image
and far fewer complete images, so this method uses much less bandwidth than the I-structure. The I-structure
gives higher frame rates when using a high resolution, but requires more bandwidth.
The GOV lengt
h determines the sum total of P-images and I-images in a GOV. Setting the GOV length to a high
value saves considerably on bandwidth. However there may be noticeable decay in the image at high values.
Note:
GOV = Group of VOPs
VOP = Video Object Plane
Video Object Plane = image
Bit Rate Control
Limiting the maximum bit rate is a good way of controlling
the bandwidth used by the MPEG-4 video stream.
Leaving the Maximum bit rate as unlimited will provide consistently good image quality, but at the expense of
increased bandwith usage whenever there is more activity in the image. Limiting the bit rate to a defined value
will prevent excessive bandwidth usage, but images will be lost when the limit is exceeded.
Note that a maximum bit rate can be used for both
variable and constant bit rates.
The bit rate type can be set as Variabl
e Bit Rate (VBR) or Constant Bit Rate (CBR). VBR will adjust the bit rate
according to the images' complexity, thus using a lot of bandwidth for a lot of activity in the image and less for
lower activity in the monitored area.
Note:
Depending on the amount of motion, the required bandwidth may increase by 1-15% for each frame.
Video Stream
This parameter can be set to fr
ame rate to increase the frame rate by 30% in 4CIF resolution. If the resolution is
set to a value lower than 4CIF, the parameter should be set to bandwidth.
Profile@Level Properties
Advanced Simple Profile @ Level 3b Max bit rate = 1,5 Mbps
ISMA compliant
Advanced Simple Profile @ Level 5 Max Bit rate = 8 Mbit/s

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