Camera Setting Requirements

Network

●Ensure that there is sufficient network bandwidth for the data volume to be sent out by camera. Also, do not send multicast stream that exceeds the bandwidth. If the entire bandwidth is used by the multicast stream, you may fail to control the camera via the network.

●Data volume to be sent by camera varies with the settings and number of distributions.

●The maximum bit rate for transmission is about 20 Mbps.

Estimation of Total Bit Rate

The total JPEG bit rate from camera is determined by the JPEG file size, number of clients, and number of frames requested by clients. The total H.264 bit rate from camera is determined by the number of distributions. Design the system by considering these points.

Bit Rate of JPEG Stream

The JPEG file size per frame varies with the encoding settings as well as input video signals. When AFS (or Average File Size) is selected, image is encoded so that the average size of multiple JPEG files becomes the target file size. If VFS (or Variable File Size) is selected, the quantization table during JPEG encoding will be maintained, and the file size will be increased or decreased according to the input signals.

For JPEG file size details, see the "Encoding" page. (A Page 26)

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 = 15 fps

If JPEG file size per piece is 120 KB, the total bit rate will be:

120 KB x 15 fps = 1800 KB/s = Approx. 14.4 Mbps

For detailed bit rate settings, see the "Encoding" page. (A Page 26)

If Multi Resolution is selected, the JPEG file size varies with the channels used.

For example, when 2 fps of 30 KB JPEG file and 3 fps of 10 KB JPEG file are sent, the total frame rate will be:

30 KB x 2 fps + 10 KB x 3 fps = 90 KB/s = Approx. 0.72 Mbps

Bit Rate of H.264 and MPEG-4 Streams

You can select either the Variable Bit Rate (VBR) or Constant Bit Rate (CBR) system for H.264 and MPEG-4 streams.

When the VBR system is selected, the bit rate varies according to the condition of input video signals. The VBR system delivers a stable picture quality, but it is difficult to forecast the bit rate.

When the CBR system is selected, data is encoded at a fixed bit rate regardless of the condition of input video signals. The picture quality varies under the CBR system, but the bit rage can be easily forecasted.

You can specify an estimated bit rate for both VBR and CBR. (64 kbps to 8192 kbps)

Memo:

●"MPEG-4" is represented on this unit's screens as "MPEG4".

Audio Data Size (for Audio-Compatible Models Only)

Up to 2 streams of audio data can be sent. Up to 1 stream of audio data can be received. Each audio data stream is 64 kbps. The size of audio data can be calculated via the following formula:

64 kbps x number of streams

The number of streams should be the total of the number of TCP streams being sent (the number of clients) plus the number of multicast streams being sent/received. For example, if the camera is sending 2 streams of audio and receiving 1 stream of audio, the data size will be the following:

64 kbps x 3 = 192 kbps

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