Network

This products enables simultaneous encoding up to three channels. However, the settable frame size and frame rate combinations are subject to restrictions.

For more details about restrictions on the combination, refer to the following.

The JPEG file size per frame varies with the encoding settings as well as the camera images. When “AFS” is selected, encoding is performed such that the target file size is the average size of multiple JPEG images. When “VFS” is selected, the quantization table during JPEG encoding will be maintained, and the file size will increase/decrease according to the camera images.

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

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

When “Multi-Encode” is selected, a different JPEG file size can be set for each channel.

For example, when 2fps JPEG files with 30 KB file size and 3fps JPEG file with 10 KB file size are transmitted, then the total bit rate will be:

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

You can select either the Variable Bit Rate (VBR) or Constant Bit Rate (CBR) system for H.264 stream.

When the VBR system is selected, the bit rate varies according to the condition of the camera images. 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 camera images. 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 8192 kbps)

H.264 Baseline cannot be set for multiple encoders at the same time. Only one channel can be set with a frame size of 1280 720 or lower and a bit rate of 1.5 Mbps or lower.

Up to 2 stream 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 the audio data can be calculated using the following formula:

64 kbps number of streams

The number of streams should be the total of the number of TCP streams being sent (the number of clients) and 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 as follows:

64 kbps 3 = 192 kbps

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 H.264, noise interference may occur and playback may fail.

When the client acquires JPEG via TCP, the camera will send out data while checking the ACK from the client at the same time. For networks with considerable delay, data cannot be sent out until ACK is received, and therefore the frame rate will drop. In the case of H.264, noise interference may occur and playback may fail.

A decrease in the frame rate due to network delays can be eliminated by receiving data via multicast.

When there is considerable network jitter, delay time may be prolonged and the image frame rate may drop. In the case of H.264, noise interference may occur and playback may fail.

When acquiring images from camera via TCP, packet loss may be recovered by TCP transmission. When there is considerable delay in the network, however, missing data may occur and the image frame rate may drop. In the case of H.264, noise interference may occur and playback may fail.

When packet loss occurs during multicast sending from camera, the image frame rate may drop. In the case of H.264, noise interference may occur and playback may fail.

The camera uses the protocols and port numbers listed below. Ensure that these ports are allowed through the firewall when a firewall is to be installed.

This camera supports ONVIF (Open Network Video Interface Forum).

ONVIF is a forum that is standardizing surveillance device network protocols.

Protocols for discovery of surveillance devices, acquisition and modification of surveillance device settings, and audio/video data transfer are standardized under ONVIF.

The initial user name and password are set as follows:

This camera fulfills the ONVIF Profile S.