Axis Communications AXIS FD-R M12 user manual Optimizing your system, Bandwidth

AXIS 209FD/FD-R/FD-R M12 40

Optimizing your system

To see the bandwidth and frame rate currently required by the video stream, the AXIS 209FD/FD-R/FD-R M12 provides a tool that can be used to display these values directly in the video image.

To do this, special format strings are added as part of a text overlay. Simply add #r (average frame rate in fps) and/or #b (average bandwidth in kbps) to the overlay.

For detailed instructions, please see the online help for Video &

Image > Text Overlay Settings, and the help for File Naming &

Date/Time Formats.

Important!

The figures displayed here are the values as delivered by the camera. If other restrictions are currently in force, (e.g. bandwidth limitation) these values might not correspond to those actually received by the client.

•For Motion JPEG, these values will be accurate as long as no frame rate limit has been specified.

Bandwidth

As there are many factors that affect bandwidth, it is very difficult to predict the required amounts. The settings that affect bandwidth are:

•image resolution

•image compression

•frame rate

•MPEG-4 GOV settings

•bit rate control settings

There are also factors in the monitored scene that will affect the bandwidth. These are:

•amount of motion

•image complexity

•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.