AXIS P5544 PTZ Dome Network Camera
Video and Audio
• The Live View page in Internet Explorer in Windows. Right-click in the image and select Pixel counter.Usethemouse
to move and resize the rectangle.
Image
The default image settings can be configured under Video & Audio > Video Stream.SelecttheImage tab.
The following settings are available:
• Resolution. Select the default resolution.
• Compression. The compress ion level affects the image quality, band width and file size of saved images; the lower the
compression, the higher the image quality with hig her bandwidth requirements and larger file sizes.
• Maximum frame rate. To avoid bandwidth p roblems, the frame rate allowed to each viewer can be limited.
• Overlay settings.SeeOverlay, on page 20.
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 r ates.
An H.264 video stream consists of different types o f frames such as I-frames and P-frames. An I-frame is a c omple t e image whe re as
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 o n
bandwidth requirements in some cases, but may also have an adverse a ffect on imag e quality.
ThebitratecanbesetasVariable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR adjusts the bit rate according to the image
complexity, using up more bandwidth for increas ed activity in the image, and less for lower image activity. CBR a llow s you to set a
fixed 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 affect
ed negatively. To partly compensate for this, it is
possible to prioritize either frame rate or imag e quality. Not setting a prior ity means that frame rate and image quality a re equally
affected. You must sa ve your settings before they can take effe ct.
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 modifier #b in the field.
MJPEG
Sometimes the image size is large due to low light or complex scene ry. Adjusting the ma ximum frame size helps to control the
bandwidth and storag e used by the Motion JPEG video stream in these situations. Setting the frame size to the Default setting
provides consistently good image q
uality 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 ma ximum f rame size should be set to an optimal value.
Stream Profiles
Astreamprofile is a set of pre-configured stream settings including resolution, compression, frame rate and overlay settings.
Stream profiles can be used:
• When setting up recording using action rules, see Events, on page 33.
• When setting up a continuous recording, see Continuous Recording, on page 37.
• In the Live View page – select the stream profile from the Video tab.
Four pre-programmed stream pro files are available for quick set up. E ach pre-programmed profile has a descriptive name, indicating
its purpose. If required, the pre-programmed stream profiles can b e modified and ne w customized stream profiles can be created.
To create a new profile or m odify an existing profile, go to Setup > Video & Audio > Stream Profiles.
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