JVC VN-685U - Manual (Page 34)

34
Network Setting
Bit Rate of MPEG4 Stream
You can select either the Variable Bit Rate (VBR) or
Constant Bit Rate (CBR) system for MPEG4 stream.
When the VBR system is selected, the bit rate varies
according to the condition of the input video signals. 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 input
video signals. 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 8000 kbps)
Restrictions on the Number of Distributions for
Camera
The maximum number of distributions for this unit is
determined by the settings as well as requirements from
the client.
When only JPEG images are distributed, the maximum
number of distributions is determined based on the
highest bit rate within the stream. When a distribution
request that exceeds the maximum number of
distributions is received, this request is denied. For
example, if Client A requests for and receives data at 1
Mbps, while Client B requests for and receives data at 5
Mbps, the maximum number of distributions is 4 streams
according to the table below.
Maximum number of distributions when only JPEG
data is distributed
When only MPEG4 images are distributed, the maximum
number of distributions is determined by the preset bit rate.
When a distribution request that exceeds the maximum
number of distributions is received, this request is denied.
When distributing only MPEG4 data
When both JPEG and MPEG4 images are
distributed simultaneously, distribution up to two
clients for JPEG and MPEG4 respectively is
possible. However, distribution requests that
exceed a total bit rate of 20 Mbps will be denied.
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 MPEG4, noise interference may
occur and playback may fail.
Network Requirements
(continued)
Distribution at
maximum bit
rate
Maxi
mum
numb
er of
distrib
utions
Total maximum
bit rate
1 Mbps and
below 20 20 Mbps
5 Mbps and
below 4 20 Mbps
10 Mbps and
below 2 20 Mbps
Larger than 10
Mbps 1 Maximum
configurable value
(24 Mbps)
Preset bit rate
Maxi
mum
numb
er of
distrib
utions
Total maximum
bit rate
0.6 Mbps and
below 20 12 Mbps
3 Mbps and
below 4 12 Mbps
6 Mbps and
below 2 12 Mbps
Larger than 6
Mbps 1 Maximum
configurable value
(8 Mbps)
Total bit rate
Maximum
number of
distributions
for JPEG
Maximum
number of
distributions
for MPEG4
20 Mbps and
below 2 2