Axis Communications Axis 211A - Manual (Page 62)

62 AXIS 210A/211A - Technical Specifications
Bandwidth
As there are many factors that affect bandwidth, it is very difficult to predict the required
amounts. The settings that affect bandwidth are:
• the image resolution
• the image compression
• the frame rate
• the MPEG-4 object type
• the MPEG-4 GOV structure
• the maximum exposure time.
There are also factors in the monitored scene that affect the bandwidth. These are:
• the amount of motion
• the image’s complexity
• the lighting conditions.
For MPEG-4, if there is only limited bandwidth available, and if this is more important
than the image quality, using a constant bit rate (CBR) is recommended. Use a variable bit
rate (VBR) if the image quality needs to be maintained at a higher level. With multiple
viewers, and If supported on the network, consider using MPEG-4 multicasting, as the
bandwidth consumption is much lower.