Operation
CB-640x Installation and User Guide Revision 100
February 2021
30
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Rate Control
:
•
CBR
(Constant Bit Rate): Specify a constant, maximum bit rate. CBR does not optimize storage or
quality, because it does not allocate enough data for complex video resulting in degraded quality and
allocates too much data for simple video. Specifying a higher bit rate results in better quality but
requires more storage.
•
CVBR
(Constrained Variable Bit Rate): Varies the amount of data per time segment, up to the
specified maximum bit rate. CVBR supports both a higher bit rate for more complex video or audio
requiring more storage space, and a lower bit rate for less complex video requiring less storage
space.
CBR Bit Rate / Max Bit Rate
: Specify 64 ~ 20000 for H.264 codec or 64 ~ 8000 for H.265 codec. The
higher the bit rate, the better the image quality. Set the maximum bit rate high enough to allow for a high
instantaneous bit rate for more complex video. A higher bit rate consumes more storage space.
Encoding Priority
(available only for H.264 with CVBR): This function enables the user to adjust the
quality of the picture along a single axis. The slider ranges from
1
(low bit rate) to
10
(high picture
quality). The default setting is
7
.
GOP
: Specify a value between
1-60
(NTSC) or
1-50
(PAL). The default is
30
for NTSC and
25
for PAL
(one I-Frame transmitted every second
)
.
The GOP is a group of successive pictures within a coded video stream. Each coded video stream
consists of successive GOPs. GOP structure specifies the order in which intra-coded frames and inter-
coded frames are arranged. The GOP uses I-Frames (Intra-coded Frames), which are static image files
(frames), as a reference for efficient H.264 and H.265 video compression. Transmitted video frames are
compared to the I-Frame as they are transmitted. Video quality is higher when the interval between I-
Frames is shorter, but the video needs more network capacity. When the interval between I-Frames is
longer, the video transmission uses less bandwidth, but the video quality is lower.
If you select the
MJPEG
codec, you can configure the stream resolution, DSCP, frame rate, and the
Quality Level
: Select
High
,
Mid
(default), or
Low
.
Low
produces the highest image quality but increases
the file size.
High
produces the lowest image quality but decreases the file size.
Multicast
Configure how the multicast address the camera uses for video and audio streaming is determined.
Address Type
:
•
Auto
(default): A connected application such as a VMS automatically determines the camera’s
multicast IP address.
•
Manual
: When selected, you can configure the camera’s multicast:
o
Address
: A valid multicast address in the range 224.0.1.1 – 239.255.255.254.
o
Port
: The port the camera uses for multicast streaming.
Note
Switches, routers, and devices must be configured to support multicast.
Metadata
Enables embedding information regarding events, such as motion and tampering, into the video stream;
required for full VMS support. Select ON (default) or OFF.
If you made any changes on the Video page, click
Save
to apply the changes. Click
Reset
to discard
changes and revert to the last saved settings.
