Axis Communications AXIS 233D user manual Frame rates, Bandwidth

66AXIS 233D - Technical Specifications

Frame rates

Motion JPEG

Test results show the frame rates in frames/second (fps) for Motion JPEG streams from the AXIS 233D, using a compression level of 50% is 25 fps for PAL and 30 fps for NTSC. Note that these values are guidelines only - actual values may vary.

MPEG-4

Test results show the frame rates in frames/second (fps) for MPEG-4 streams from the AXIS 233D is 25 fps for PAL and 30 fps for NTSC. Note that these values are guidelines only - actual values may vary.

The MPEG-4 test conditions:

•Compression level = 50%

•Video Object Type = Advanced Simple

•GOV structure = IP

Bandwidth

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

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.