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AXIS Q1602 N etwork Camera
Video and Au dio
• 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 file sizes.
• Rotate image. If required, the image can be rotated.
• Maximum frame rate. To avoid bandwidth p roblems, the frame rate allowed to each viewer can be limited .
• Overlay settings.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 of frames such as I-frames and P-frame s. An I-fram e is a com ple te image w h e reas
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 com pre ss ion tha n the Base line pr ofile with the same
video quality, but requires more processing power to decode.
ThebitratecanbesetasVariable Bit Rate (VBR) or Constant Bit Rate (C BR ). VBR adjusts the bit rate according to the image
complexity, using up mo re b andw idth for incre ased a ctivity in the ima ge , 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 wo uld 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 im age quality. Not se tting a priority means that frame rate and image quality a re equally
affected. You must save y o u r settings b efore t h ey 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 field.
MJPEG
Sometimes the image size is large due to low light or com ple x scenery. Adj
usting the m aximum 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 m a xim um frame size should be set to an optimal value.
Stream Profiles
Astreamprofile is a set of pr e-con figured stream settings including resolution, compression, fram e rate and overlay settings.
Stream profiles can 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-programm e d profile has a descriptive name, indicating
its purpose. If required, the pre-programmed stream profiles can be modifi ed and new customized stream pro files can be created.
To create a new profile or modify an existing pro file, go to Setup > Video & Audio > Stream Profiles.
To select a defa ult stream profile for the Live View page, go to Setup > Live View Config.
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