JVC VN-X35U User Manual download pdf (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

he 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

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.

Distribution

at maximum

bit rate

Maximum

number of

distributions

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

Maximum

number of

distributions

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

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JVC VN-X35U User Manual Page 25

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