User manual

AXIS M3006–V Network Camera
Video
Image
The de fault image setting s can be configured under Video> Video Stream. Select the Image tab.
The follo wi ng settings are available:
• Resolution. Select the default resolution.
• Compression. The compress ion lev el affe cts 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 b e rotated.
• Mirror. If r equired, the image can be mirrored.
• Maximum frame rate. To avoid bandwidth problems, the frame rate allowed to e ach viewer can be limited .
• Overlay settings.See
Overlay on page 1 9 .
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-fram e is a complete image whereas
P-frames only contain the differences from previous f ram e s .
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 als o have an adverse affe ct on imag e quality.
The Axis product supports two H.264 profiles.TheMainprofi le provides highe r compression than the Baseline pr ofile with the same
video quality, bu t requires m or e processing power to decod e.
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, a nd less for lower image activity. CBR 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. Yo u must save yo u r settings before t h ey 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 s cenery. Ad justing the maximum frame size helps to control the
bandwidth and storage used by the Motion JPEG video stream in these 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 b
andwidth and storage usag e, but may give poor im age quality. To prevent i ncreased bandwidth and storage usage,
the maximum frame size should be set to an optim a l value.
Stream Profi les
Astreamprofile is a set of pre-configured stream settings including resolution, compression, frame rate and o ve rlay settings.
Stream pro files can b e used:
• When setting up recording using action rules, see
Events on page 29 .
• When setting up a continuous recording, see
Continuous Recording on page 32 .
• In the Live View page — select the stream profile fro m the Stream profile drop-down list.
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