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AXIS M1143–L
Setting Up the Product
Image
The default image settings can be configured under Video> Video Stream. Select the Im age tab.
The following settings are available:
• Resolution. Select the default resolution.
• Compression. The compression lev el 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.
• Mirror. If r equired, the image can be mirrored.
• Maximum frame rate. To avoid bandwidth problems, the frame rate allowed to each v ie we r ca n be limited.
• Overlay settings.See
Overlay o n page 17
.
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 q uality 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 c om ple te image whe reas
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 q uality.
The Axis pro duct supports two H.264 profiles.TheMainprofile provides higher compression than the Baseline pro file with the same
video quality, but requires m ore 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 increased activity in the i
mage, and less for lower image activity. CB R allows 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 frame rate or image quality. N
ot setting a priority means that frame rate and image quality are equally
affected. You must save you r settin g s before they ca n take effec t.
The current bit rate can be set to a ppear as text overlay. To do this, select the Include text check box option under Overlay
Settings and enter the m odifier #b in the field.
MJPEG
Sometimes the image size is
large due to low light or complex scenery. Ad justing the maximum frame size helps to control the
bandwidth and storage used by the Motion JPEG video stream i n 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 lo w light. Limiting the frame
size optimizes b
andwidth and storage usage, but may give poor image quality. To prevent increased bandwidth and storage usage,
the ma ximum fram e size should be set to an optimal value.
Stream Profiles
Astreamprofile is a s et of pre-configured stream settings including resolution, compression, frame rate and overlay settings.
Stream profiles c a n be used:
• When setting up recording using action rules, see
Events on p age 27
.
• When setting up a continuous recording, see
Continuous Recording on page 31
.
• In the Live View page — select the stream profile from the Stream profile drop-down list.
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