JVC VN-X35U Instructions Manual page 25

The maximum number of distributions varies
with the bit rate settings as well as the client's
requested frame rate. Up to 20 streams can be
distributed (including multicast). The total frame
rate refers to the sum of these frame rates.
For example, when 10 fps is requested by two
clients, and in addition, multicast is transmitted
at a rate of 10 fps, the total frame rate will be:
10 + 10 + 10 = 30 fps
For example, when 5 fps is requested by two
clients, and in addition, multicast is transmitted
at a rate of 5 fps, the total frame rate will be:
5 + 5 + 5 = 15fps
If JPEG file size per piece is 120KB, total bit rate will be:
120KB 15fps = 1800KB/s = 14.4Mbps
(approx.).
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)
Bit Rate of Audio
Only 1 audio data stream can be recieved. Data
volume for 1 audio stream is 64 kbps. Audio data
volume may be calculated using the following formula.
64 kbps x no. of streams
The number of streams is the total number of streams
sent via TCP (number of clients), streams sent via
multicast, and stream received by VN-X35U
(Example) When VN-X35U sends out 2 audio streams
and receives 1 audio stream, data volume will be as
follows.
64 kbps x 3 = 192 kbps
Restrictions on the Number of
Distributions for VN-X35U
The maximum number of distributions for VN-X35U 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
Distribution Maximum
at maximum number of
bit rate distributions
1 Mbps and 20
below
5 Mbps and 4
below
10 Mbps and 2
below
Larger than 1
10 Mbps
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
Maximum
Preset bit
number of
rate
distributions
0.6 Mbps 20
and below
3 Mbps and 4
below
6 Mbps and 2
below
Larger than 1
6 Mbps
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.
Maximum
Total bit number of
rate distributions
for JPEG
20 Mbps and 2
below
Total
maximum bit
rate
20 Mbps
20 Mbps
20 Mbps
Maximum
configurable
value
(24 Mbps)
Total
maximum bit
rate
12 Mbps
12 Mbps
12 Mbps
Maximum
configurable
value (8 Mbps)
Maximum
number of
distributions
for MPEG4
2
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