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Grandstream Networks, Inc. GXV3662_HD/FHD User Manual Page 22 of 48
Firmware Version 1.0.1.71 Last Updated: 01/2013
Figure 8: Video & Audio Settings Page
Primary Stream Settings:
o Preferred Video Codec: H.264 supported.
o Resolution: The video resolution in pixel used in camera video, the higher the
resolution is, the better the video quality is, and higher bandwidth
is required.
o Bit Rate: The number of bits that are conveyed or processed per unit of
time.
o Max Frame Rate: The video frame rate is adjustable based on network conditions.
Increasing the frame rate will increase the amount of data
significantly therefore consuming more bandwidth. Video will be
impaired due to packet loss when there is insufficient bandwidth.
o Bit Rate Control: Variable Bit rate (VBR) and Constant Bit Rate (CBR). Variable
Bit Rate - If VBR is selected, the codec varies the amount of
output data per time segment. VBR produces a better quality-to-
space ratio. The bits available are used to enable more flexibly
and encode sound or video data more accurately, with fewer bits
used in less demanding passages and more bits used in difficult-
to-encode passages. Constant Bit Rate - If CBR is selected, the
codec‘s output data is constant regardless of the input data. The
output bit rate is defined in ―Bit rate‖. CBR is useful for
streaming multimedia content on limited capacity channels. It is
easier to calculate required bandwidth as well as the required
storage space using CBR.
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