Axis 213 PTZ User Manual

Axis 213 PTZ User Manual Manual pdf 14 page image

14 AXIS 213 - Video and Audio StreamsVideo and Audio StreamsThe AXIS 213 provides several different image and video formats. The type to usedepends on your requirements and on the properties of your network.The Live View page in the AXIS 213 provides access to Motion JPEG and MPEG-4video streams, as well as to single JPEG images. Other applications and clients canalso access these video and audio streams/images directly, without going via the LiveView page.Video Stream TypesMotion JPEGThis format uses standard JPEG still images in the video stream. These images arethen displayed and updated at a rate sufficient to create a stream that showsconstantly updated motion.The Motion JPEG stream uses considerable amounts of bandwidth, but also providesexcellent image quality and access to each and every individual image contained inthe stream.Note also that multiple clients accessing Motion JPEG streams can use differentimage settings.MPEG-4This is a video compression standard that makes good use of bandwidth, and whichcan provide high-quality video streams at less than 1 Mbit/s.The MPEG-4 standard provides scope for a large range of different coding tools foruse by various applications in different situations, and the AXIS 213 provides certainsubsets of these tools. These are represented as Video object types, which are selectedfor use 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 allowsthe amount of bandwidth usage to be controlled. CBR (constant bit rate) is used toachieve a specific bit rate by varying the quality of the MPEG-4 stream. When usingVBR (variable bit rate), the quality of the video stream is kept as constant as possible,at the cost of a varying bit rate.