Axis 247S User Manual

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

Axis 247S User Manual Manual pdf 39 page image

AXIS 247S - Technical Specifications39General performance considerationsWhen setting up your system, it is important to consider how various settings and situations will affectperformance. Some factors affect the amount of bandwidth (the bit rate) required, others can affect the framerate, and some will affect both. If the load on the CPU reaches its maximum, this will also affect the frame rate.The following factors are among the most important to consider:• High image resolutions and/or lower compression levels result in larger images. Bandwidth affected.• Access by large numbers of Motion JPEG and/or unicast MPEG-4 clients. Bandwidth affected.• Simultaneous viewing of different streams (resolution, compression, etc.) by different clients. Framerate and bandwidth affected.• Accessing both Motion JPEG and MPEG-4 video streams simultaneously. Frame rate and bandwidthaffected.• Heavy usage of event settings affects the CPU load. Frame rate affected.• Enabled motion detection. Frame rate and bandwidth affected.• Heavy network utilization due to poor infrastructure. Bandwidth affected• Viewing on poorly performing client PC lowers perceived performance. Frame rate affected.• Access by large number of audio clients using full-duplex mode. Bandwidth affected.Optimizing your systemTo see the bandwidth and frame rate currently required by the video stream, the Video Server provides a toolthat can be used to display these values directly in the video image.To do this, special format strings are added as part of a textoverlay. 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 server. If other restrictions arecurrently in force, (e.g. bandwidth limitation) these values might not correspond to thoseactually received by the client.•For Motion JPEG, these values will only be accurate as long as no frame rate limit has been specified.Frame rates - Motion JPEGThe following test results show the frame rates in frames/second (fps) for Motion JPEG streams from the VideoServer, using a compression level of 50%. Note that these values are guidelines only - actual values may vary.Resolution fps (NTSC/PAL)4CIF 30/252CIF 30/25CIF 30/25QVGA 30/25QCIF 30/25