Axis Communications axis fixed dome network camera Frame rates - Motion JPEG and MPEG-4

AXIS 225FD - Technical Specifications

Frame rates - Motion JPEG and MPEG-4

The following table shows typical frame rates in frames/second (fps) for Motion JPEG and MPEG-4 video streams from the AXIS 225FD.

Note that these values are guidelines only - actual values may vary.

Motion JPEG settings:

•Viewing in AMC

•Compression level = 30%

MPEG-4 settings:

•Viewing in AMC

•Compression level = 30%

•Video Object Type = Advanced Simple

•GOV length = 8

•GOV structure = IP*

	Frame rates
	Motion JPEG	MPEG-4
640x480	30	21
480x360	30	30
320x240	30	30
160x120	30	30

*Note that setting the GOV structure to use “I-frames only” will increase the frame rate at the expense of the bit rate.

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 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.

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