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AXIS Q1604 Network Camera
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 netw ork, you can limit the frame rate allowed to each viewe r. The max imum frame 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 i mage as overlay. See
Overlay, on page 21
.
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 q uality video streams at low bit rates.
An H .264 video stream consists o f different types of frames such as I-frames, P-frames and B-fra mes. An I-frame is a comple te image
whereas P-frames and B-frames only contain the differences from previous/future 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.
The Axis product supports two H.264 profiles.TheMainprofile provides higher compression than the Baseline profile with the same
video quality, b u t requires more processing power to decode.
ThebitratecanbesetasVariable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR adjusts the bit rate according to the image
complexity, using up more bandwidth for incre ased a ctivity in the image, and less for lower image activity. CBR 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 quality are affected negatively. To partly 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 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, 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 complex scenery. Adjusting the maximum fra me size helps to c ontrol 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 ba
ndwidth and storage usage in low light. Limiting the frame
size optimizes bandwidth and storage usage, but may give poor image quality. To prevent i ncreased bandwidth and storage usage,
the ma ximum f rame size should be set to an optimal value.
Stream Profiles
There are four pre-programmed stream profiles available for quick set up. The settings for these can be adjusted. Ne w customized
profiles can also be created. Each profile has a descriptive name, indicating its purpose.
•Thestreamprofiles can be accessed from the Stream profile drop-down list in the Live View page.
• To add, copy, modify, and remove stream profiles go to Video & Audio > Stream Profiles.
• To select the default stream profile go to Live View Config > 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 pro v ides access to advanced image settings for the Axis product.
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