AXIS Q1602 Network Camera
Video and Audio
• Compression. The compression level affects the image quality, bandwidth and file size of saved images; the lower the
compression, the higher the image quality with higher bandwidth requirements and larger fi le sizes.
• Rotate image. If required, the image can be rotated.
• Maximum frame rate. To avoid bandwidth problems, the frame rate allo we d to each viewer can be limited.
• Overlay s ettings.See
Overlay, on page 18
.
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 o f frames such as I-frames and P-frames. An I-frame is a com ple te image w h e re as
P-frames only contain the differences from previous frames .
The GOV length is the number of fram es betw een 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 Axis product supports two H.264 profiles.TheMainprofile provides higher compress ion tha n the Base line pr ofile with the same
video quality, but requires more processing power to decode.
ThebitratecanbesetasVa riable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR adjusts the bit rate according to the image
complexity, using up more b andw idth for increased activity in the image, and less for lo we r ima ge ac tivity. CB R a llow s you to s et 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 qualityareaffectednegatively. Topartly 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 eq ually
affected. You must sa ve you r setting s bef ore 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 modifier #b in the fiel d.
MJPEG
Sometimes the image s ize is large due to low light or complex scenery. Adj
usting the maximum 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 quality at the expense of increased bandwidth and storage usage in low light. Limiting the frame
size optimizes bandwidth and storage usag e, but
may give poor image quality. To prevent increased bandwidth and storage usage,
the ma ximum frame size should be set to an optim a l value.
Stream Pro files
Astreamprofile is a set of pre-configured stream settings including resolution, compression, frame rate and o ve rlay se ttings .
Stream profiles ca n be used:
• When setting up recording using action rules, see
Events, on page 30
.
• When setting up a continuous recording, see
Continuous Recording, on page 33
.
• In the Live View page — select the stream profile from the Stream profile drop-down list.
Four pre-programmed stream profiles are available for quick set up. Each pre-programme d p rofile has a descriptive name, indicating
its purpose. If required, the pre-programmed stream profiles can be modified and new customized stream pro files can be created.
To create a new profile or modify an existing profile, go to Setup > Video & Audio > Stream Profiles.
To select a defau lt stream profile for the Live View page, go to Setup > Live View Config.
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