Axis Communications Security Camera Axis Communications Security Camera User Manual

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AXIS P5512-E PTZ Dome Network Camera
Video
Image
The default image settings can be congured under Video> Video Stream. Select the Image tab.
The following settings are available:
• Resolution. Select the default resolution.
• Select Aspect ratio correction to improve the appearance of images in the browser when the video stream has a different
aspect ratio. Pixels comprising the image are rearranged so as to provide a more accurate representation of the image.
• Compression. The compression level affects the image quality, bandwidth and le size of saved images; the lower the
compression, the higher the image quality with higher bandwidth requirements and larger le sizes.
• Rotate image. If required, the image can be rotated.
• Maximum frame rate. To avoid bandwidth problems, the frame rate allowed to each viewer can be Limited to a xed
amount. Alternatively, the frame rate can be set as Unlimited, which means the Axis product always delivers the highest
frame rate possible under the current conditions.
• Overlay settings. See Overlay, on page 19.
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 bit 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 GOV length is the number of frames between two consecutive I-frames. Increasing the GOV length may save considerably on
bandwidth requirements in some cases, but may also have an adverse affect on image quality.
The bit rate can be set as Variable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR adjusts the bit rate according to the image
complexity, using up more bandwidth for increased activity in the image, and less for lower image activity. CBR allows you to set a
xed Target bit rate that consumes a predictable amount of bandwidth. As the bit rate would usually need to increase for increased
image activity, but in this case cannot, frame rate and image quality are affected negatively. To partly compensate for this, it is
possible to prioritize either frame rate or image quality. Not setting a priority means that frame rate and image quality are equally
affected. You must save your settings before they can take effect.
The current bit rate can be set to appear as text overlay. To do this, select the Include text check box option under Overlay
Settings and enter the modier #b in the eld.
MJPEG
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 give poor image quality. To prevent increased bandwidth and storage usage,
the maximum frame size should be set to an optimal value.
Stream Proles
A stream prole is a set of predened stream settings including resolution, compression, frame rate and overlay settings. Stream
proles can be used:
• When setting up recording using action rules. See Events, on page 30.
• When setting up continuous recording. See Continuous Recording, on page 34.
• In the Live View page – select the stream prole from the Stream prole drop-down list.
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