Axis 231D+ User Manual

Also see for AXIS 231D+: Specifications Product guide Connection guide User manual Installation guide

11AXIS 231D+/232D+ - Video StreamsVideo StreamsThe AXIS 231D+/232D+ provides several different image and video stream formats. Thetype to use depends on your requirements and on the properties of your network.The Live View page in the AXIS 231D+/232D+ provides access to Motion JPEG andMPEG-4 video streams, as well as to single JPEG images. Other applications and clientscan also access these video streams/images directly, without going via the Live View page.Stream TypesMotion JPEGThis format uses standard JPEG still images in the video stream. These images are thendisplayed and updated at a rate sufficient to create a stream that shows constantly updatedmotion.The Motion JPEG stream uses considerable amounts of bandwidth, but also providesexcellent image quality and access to each and every individual image contained in thestream.Note also that multiple clients accessing Motion JPEG streams can use different imagesettings.MPEG-4This is a video compression standard that makes good use of bandwidth, and which canprovide high quality video streams at less than 1 Mbit/s.Notes: • MPEG-4 is licensed technology. The AXIS 231D+/232D+ includes one viewing client license. Installingadditional unlicensed copies of the viewing client is prohibited. To purchase additional licenses, con-tact your Axis reseller.• All clients viewing the MPEG-4 stream must use the same image settings.The MPEG-4 standard provides scope for a large range of different coding tools for use byvarious applications in different situations, and the AXIS 231D+/232D+ provides certainsubsets of these tools. These are represented as Video object types, which are selected foruse with different viewing clients. The supported video object types are:• Simple - sets the coding type to H.263, as used by e.g. QuickTime™.• Advanced Simple - sets the coding type to MPEG-4 Part 2, as used by AMC (AXISMedia Control)When using MPEG-4 it is also possible to control the bit rate, which in turn allows theamount of bandwidth usage to be controlled. CBR (constant bit rate) is used to achieve aspecific bit rate by varying the quality of the MPEG-4 stream. When using VBR (variablebit rate), the quality of the video stream is kept as constant as possible, at the cost of avarying bit rate.