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AXIS Q6035 PTZ Dome Network Camera
Video and Audio
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 compression level affects the image quality, bandwidth and file size of saved images; the lower the
compression, the higher the imag e quality with hig her bandwidth requirements and larger file sizes.
• Rotate image. If required, the image can be rotated.
• Maximum frame rate. To avoid bandwidth problems, the frame rate allowed to each viewe r can be limited.
• 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 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 on
bandwidth requirements in some cases, b ut may also hav e an adverse affect on image quality.
ThebitratecanbesetasVariable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR adjusts the bit rate according to the image
complexity, using up more bandw idth for increased activity in the image, and less for lower image activity. CBR allows you to set a
fixed Ta rget bit rate that consumes a predictable amount of bandwidth. As the bit rate would usually need to increase for increa
sed
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 e ither 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, s
elect 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 scenery. Adjusting the maximum frame size helps to control the
bandwidth and storage used by the Motio
n 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 s
et 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 c an be used:
• When setting up recording using action rules, see
Events, on page 34
.
• When setting up a continuous recording, see
Continuous Recording, on page 38
.
• 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. E ach pre-programmed profile has a descriptive na m e, indicating
its purpose. If required, the pre-programmed stream profiles can be modified and new customized stream profiles c an be created.
To create a new profile or modify an existing pro file, go to Setup > Video & Audio > Stream Profiles.
To se lect a default stream profile for the Live View page, go to Setup > Live View Config.
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