JVC V685U Instructions - Page 34

Network Setting Network Requirements (continued) 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) Restrictions on the Number of Distributions for Camera The maximum number of distributions for this unit 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 at maximum bit rate Maxi mum numb er of distrib utions Total maximum bit rate 1 Mbps and 20 20 Mbps below 5 Mbps and 4 below 20 Mbps 10 Mbps and 2 below 20 Mbps Larger than 10 1 Mbps Maximum 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 rate Maxi mum numb er of distrib utions Total maximum bit rate 0.6 Mbps and 20 below 12 Mbps 3 Mbps and 4 below 12 Mbps 6 Mbps and 2 below 12 Mbps Larger than 6 1 Mbps Maximum 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. Total bit rate 20 Mbps and below Maximum number of distributions for JPEG 2 Maximum number of distributions for MPEG4 2 Insufficient network bandwidth 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 MPEG4, noise interference may occur and playback may fail. 34