Loading ...
Loading ...
Loading ...
AXIS Q7424–R0N,,
Video and Audio
Setting the compression level affects the image quality and bandwidth; the lower the compression, the higher the image quality
with higher bandwidth requirements.
To avoid bandwidth problems on the network, you can limit the frame rate allowed to each viewer. The maxim um fra m e rate can be
set to Unlimited, or you can limit the frame rate to a value.
An image or text can be superimposed over the image as overlay. See
Overlay, on page 18
.
Save your settings before they can take effect.
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 whereas
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, but may also have an adverse affect on image quality.
ThebitratecanbesetasVariable Bit Rate (VBR) or Constant Bit Rate (C BR). VBR adjusts the bit rate according to the image
complexity, using up more bandwidth for increased activity in the image, and less for lower image activity. CBR allow 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 qualityareaffectednegatively. Topartly compensate for this, it is
possible to prioritize either fra m e rate or im age quality. Not setting a priority me ans that fram e r ate and image quality are equally
affected. Yo u must save you r setting s before they can take effect .
The current bit rate c an 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 comple x scenery. Adjusting the maxi
mum 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 ma ximum f rame size should be s et to an optimal value.
Quad stream
A Quad view displays images from all four channe ls on a single scree n; where the ima ges f rom each camera take up a quarter of
the display area. It is possible to define settings for the video stream in quad view.
Stream Profiles
There are four pre-programmed stream profile s available for quick set up. The settings for these can be adjus ted. New customized
profiles can also be created. Each profile has a descriptive name, indicating its purpose.
•Thestreamprofiles can be accessed from the Stream profi le dro p-dow n l ist in the Live View pag e.
• To add, copy, modify, and remove stream profiles go to Video & Audio > Stream Pro files.
• To select the default stream pr ofile go to Live View C onfig > Stream Profile and choose the profile from the drop-down list.
For more information see the online help
on this page.
Camera Settings
The Video & Audio > Camera Settings page provides access to advanced image settings for the Axis product.
17
Loading ...
Loading ...
Loading ...