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Bit Rate of H.264 Stream
You can select either the Variable Bit Rate (VBR)
or Constant Bit Rate (CBR) system for H.264
stream.
When the VBR system is selected, the bit rate
varies according to the condition of the camera
images. The VBR system delivers a stable picture
quality, but forecast of the bit rate is difficult. When
the CBR system is selected, encoding is performed
at a fixed bit rate regardless of the condition of the
camera images. The picture quality varies under
the CBR system, but the bit rate can be easily
forecast.
You can specify an estimated bit rate for both VBR
and CBR. (64 kbps to 8192 kbps)
H.264 Baseline cannot be set for multiple encoders
at the same time. Only one channel can be set with
a frame size of 1280´720 or lower and a bit rate of
1.5 Mbps or lower.
Insufficient Network Bandwidth
When there is insufficient bandwidth, the number
of JPEG frames (frame rate) that the client can
acquire will decrease. Delay will also occur in the
distribution of images. In the case of H.264, noise
interference may occur and playback may fail.
Network Delay
When the client acquires JPEG via TCP, the
camera will send out data while checking the ACK
from the client at the same time. For networks with
considerable delay, data cannot be sent out until
ACK is received, and therefore the frame rate will
drop. In the case of H.264, noise interference may
occur and playback may fail.
A decrease in the frame rate due to network delays
can be eliminated by receiving data via multicast.
Network Jitter
When there is considerable network jitter, delay
time may be prolonged and the image frame rate
may drop. In the case of H.264, noise interference
may occur and playback may fail.
Packet Loss
When acquiring images from camera via TCP,
packet loss may be recovered by TCP
transmission. When there is considerable delay in
the network, however, missing data may occur and
the image frame rate may drop. In the case of
H.264, noise interference may occur and playback
may fail.
When packet loss occurs during multicast sending
from camera, the image frame rate may drop. In the
case of H.264, noise interference may occur and
playback may fail.
Network
16
List of Protocols and Port Numbers
Used by Camera
The camera uses the protocols and port numbers
listed below. Ensure that these ports are allowed
through the firewall when a firewall is to be installed.
Protocol/Port number
Source
TCP/80
TCP/32040
Destination
TCP/ User-defined
number
UDP/ User-defined
number
Purpose of use
JPEG/H.264 acquistion,
Web Settings page, API
Alarm distribution
Sending alarm
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