Axis Communications 241S Manuel D’Utilisation

As there are many factors affecting 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 analog cameras connected to the video server

There are also factors in the monitored scene that will 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. If supported on the 

network, consider also using MPEG-4 multicasting, as the bandwidth consumption will be 

much lower.