Axis Communications M7010 M7010 Video Encoder - User Manual - Page 14

Image, H.264

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AXIS M7010 Video Video It is possible to configure the following video features in your Axis product: • Video stream. See page 14. • Stream profiles. See page 15. • Camera settings. See page 15. • Overlay image. See page 16. Video Stream You can define the following video stream settings from Video > Video Stream: • Image. See page 14. • H.264. See page 14. • MJPEG. See page 15. Note Video stream can be configured for each channel including quad stream. Image The default image settings can be configured under Video> Video Stream. Select the Image tab. The following settings are available: • Resolution. Select the default resolution. • Compression. The 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 sizes. • Rotate image. If required, the image can be rotated. • Maximum frame rate. To avoid bandwidth problems, the frame rate allowed to each viewer can be limited. • Overlay settings. See Overlay, on page 16. 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-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. The bit rate can be set as Variable 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 image, and 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 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. 14

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AXIS M7010
Video
Video
It is possible to con
fi
gure the following video features in your Axis product:
•
Video stream. See
page 14
.
•
Stream pro
fi
les. See
page 15
.
•
Camera settings. See
page 15
.
•
Overlay image. See
page 16
.
Video Stream
You can de
fi
ne the following video stream settings from
Video
>
Video Stream
:
•
Image. See
page 14
.
•
H.264. See
page 14
.
•
MJPEG. See
page 15
.
Note
Video stream can be con
fi
gured for each channel including quad stream.
Image
The default image settings can be con
fi
gured under
Video> Video Stream
. Select the
Image
tab.
The following settings are available:
•
Resolution
. Select the default resolution.
•
Compression
. The compression level affects the image quality, bandwidth and
fi
le size of saved images; the lower the
compression, the higher the image quality with higher bandwidth requirements and larger
fi
le sizes.
•
Rotate image
. If required, the image can be rotated.
•
Maximum frame rate
. To avoid bandwidth problems, the frame rate allowed to each viewer can be limited.
•
Overlay settings
. See
Overlay, on page 16
.
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-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.
The bit rate can be set as
Variable 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 image, and less for lower image activity. CBR allows you to set a
fi
xed
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 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.
14