Axis Communications 207/207W - Manual (Page 19)

19 AXIS 207/207W - Configuration
Advanced - MPEG-4 Settings
GOV Settings
The GOV structure describes the composition of the MPEG-4 video stream. Setting the
GOV-length to a high value saves considerably on bandwidth. The Cyclic refresh
parameter gives a smoother bit rate and can be useful if bandwidth is limited.
Note:
Cyclic refresh should not be enabled if Event handling is enabled and the file format is set to MPEG-4 under
Upload images/video (under Setup > Event configuration > Event settings).
Bit Rate Control
Limiting the maximum bit rate is a good way of controlling the bandwidth used by the
MPEG-4 video stream. Leaving the Maximum bit rate as unlimited will provide
consistently good image quality, but at the expense of increased bandwith usage whenever
there is more activity in the image. Limiting the bit rate to a defined value will prevent
excessive bandwidth usage, but images will be lost when the limit is exceeded.
Note that a maximum bit rate can be used for both variable and constant bit rates.
The bit rate type can be set as Variable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR will
adjust the bit rate according to the images' complexity, thus using a lot of bandwidth for a
lot of activity in the image and less for lower activity in the monitored area.
Audio Settings
General
The AXIS 207/207W has a built-in microphone for one way MPEG-4, ISMA, 3GPP
compatible audio.
Enable audio - click the checkbox to enable Audio (disabled by default).
Note:
To receive synchronized video and sound, it is recommended that the camera time is synchronized with an
NTP Server. This is enabled under
System Options > Date & Time. Please refer to the help pages for more
information.