Axis 241Q User Manual

Also see for 241Q Blade: Specifications Installation guide Specifications Datasheet Specifications

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Axis 241Q User Manual Manual pdf 16 page image

16 AXIS 241Q/S/QA/SA - Video and Audio StreamsRTP+RTSPThis method (actually RTP over UDP and RTSP over TCP) should be your firstconsideration for live video, especially when it is important to always have an up-to-datevideo stream, even if some images do get dropped. This can be configured as multicast orunicast.Multicasting provides the most efficient usage of bandwidth, especially when there arelarge numbers of clients viewing simultaneously. Note however, that a multicast broadcastcannot pass a network router unless the router is configured to allow this. It is thus notpossible to multicast over e.g. the Internet.Unicasting should be used for video-on-demand broadcasting, so that there is no videotraffic on the network until a client connects and requests the stream. However, if moreand more unicast clients connect simultaneously, the server will at some point becomeoverloaded. There is also a maximum of 20 simultaneous viewers to be considered.RTP/RTSPThis unicast method is RTP tunneled over RTSP. This can be used to exploit the fact that itis relatively simple to configure firewalls to allow RTSP traffic.RTP/RTSP/HTTP or RTP/RTSP/HTTPSThese two methods can also be used to traverse firewalls. Firewalls are commonlyconfigured to allow the HTTP protocol, thus allowing RTP to be tunneled.Other methods of accessing the video streamVideo/images from the Video Server can also be accessed in the following ways:ï If supported by the client, the Video Server can use Motion JPEG server push to displayvideo. This option maintains an open HTTP connection to the browser and sends data asand when required, for as long as required.ï As single JPEG images in a browser. Enter e.g. the path:http:///axis-cgi/jpg/image.cgi?resolution=CIFï Windows Media Player. This requires AMC and the MPEG-4 decoder to be installed. Thepaths that can be used are listed below, in the order of preference.ï Unicast via RTP: axrtpu:///mpeg4/#/media.ampï Unicast via RTSP: axrtsp:///mpeg4/#/media.ampï Unicast via RTSP, tunneled via HTTP: axrtsphttp:///mpeg4/#/media.ampï Unicast via RTSP, tunneled via HTTPS: axrtsphttps:///mpeg4/#/media.ampï Multicast: axrtpm:///mpeg4/#/media.ampNotes: ï = IP address.ï # = video source number or the quad stream. This is set to 1 if omitted.