Axis Communications AXIS 225FD - Manual (Page 45)

AXIS 225FD - Technical Specifications
45
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*
*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.
Frame rates
Motion JPEG MPEG-4
640x480 30 21
480x360 30 30
320x240 30 30
160x120 30 30