Axis 247S User Manual

Also see for 247S: Specifications Brochure & specs Installation guide Datasheet

Axis 247S User Manual Manual pdf 40 page image

AXIS 247S - Technical Specifications40Frame rates - MPEG-4The following test results show the frame rates in frames/second (fps) for MPEG-4 streams from the VideoServer. 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**Note that setting the GOV structure to use “I-frames only” will increase the frame rate.BandwidthAs there are many factors affecting bandwidth, it is very difficult to predict the required amounts. The settingsthat 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• the audio settingsThere 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 bemaintained at a higher level. If supported on the network, consider also using MPEG-4 multicasting, as thebandwidth consumption will be much lower.Resolution fps (NTSC/PAL)4CIF 27/23VGA 30/252CIF 30/25CIF 30/25QVGA 30/25QCIF 30/25