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

Total

at maximum

number of

maximum bit

bit rate

distributions

rate

 

 

 

1 Mbps and

20

20 Mbps

below

 

 

 

 

 

5 Mbps and

4

20 Mbps

below

 

 

 

 

 

10 Mbps and

2

20 Mbps

below

 

 

 

 

 

Larger than

1

Maximum

10 Mbps

 

configurable

 

 

value

 

 

(24 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

Preset bit

Maximum

Total

number of

maximum bit

rate

distributions

rate

 

 

 

 

0.6 Mbps

20

12 Mbps

and below

 

 

 

 

 

3 Mbps and

4

12 Mbps

below

 

 

 

 

 

6 Mbps and

2

12 Mbps

below

 

 

 

 

 

Larger than

1

Maximum

6 Mbps

 

configurable

 

 

value (8 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

Maximum

Total bit

number of

number of

rate

distributions

distributions

 

for JPEG

for MPEG4

 

 

 

20 Mbps and

2

2

below

 

 

 

 

 

25