AXIS Q6032-E PTZ Dome Network Camera
Video
The following settings are availa ble:
• Resolution. Select the default resolution.
• Compression. T he 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 size s.
• Rotate image. If required, the image can be rotated.
• Maximum frame rate. To avoid bandwidth problems, the frame rate allowed to each vie wer 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-fr ame s. An I-frame is a complete image whereas
P-frames only contain the differences from previous frames.
The GOV length is the number o f 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 adve rse affect 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 mo re bandwidth for increased activity in the image, an d less for lower image activity. CBR allows you to set a
fixed Target bit rate that consumes a predictable amount of band width. 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 fra me rate or image quality. Not setting a priority m e ans that frame r ate and image quality are equally
affected. You must save your settings before they can take effect.
The c urrent bit rate can be set to appear as text overlay. To do this, select the Inc
lude 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 Motion JPEG video stream in the
se situations. Setting the frame size to the Default setting
provides consistently good im age 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 im age quality. To prevent increased bandwidth and storage usage,
the m aximum frame size should be set to an op
timal v alue.
Stream Profiles
Astreamprofile is a set of pre-configured stream settings including resolution, compression, f rame rate and overlay settings.
Stream profiles can be used:
• When setting up recording using action rules, see
Events, on page 31
.
• When setting up a continuous recording, see
Continuous Recording, on page 35
.
• In the Live View page — select the stream pro file from the Stream profile drop-down list.
Four pre-programmed stream profiles are available for quick s et up. Each pre-programmed profile has a descriptive name, indicating
its purpose. If required, the pre-programmed stream profiles can be modified and n ew customized stream profiles can be created.
To create a n ew profile or modify an existing profile, go to Setup > Video > Stream Profiles.
To select a d efault stream profile for the Live View page, go to Setup > Live View Config.
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