MMS协议

发布于 2009-08-17 07:52:42
MMS(Microsoft Media Server protocol)是一种串流媒体传送协议,用来访问并流式接收Windows Media服务器中.asf文件的一种协议。MMS协议用于访问Windows Media发布点上的单播内容。MMS是连接Windows Media单播服务的默认方法。若观众在Windows Media Player中键入一个URL以连接内容,而不是通过超级链接访问内容,则他们必须使用MMS协议引用该流。MMS的默认埠(端口)是1755。 现在除了Windows Media外,如KMPLAYER等流行的播放器也支持该协议,有些播放器已经带有许多的媒体信息地址,用户可以很方便地通过网络看电视、电影。。。,当然这还是免费的。

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bernard
bernard 2009-08-17
Microsoft Media Server (MMS) is the name of Microsoft's proprietary network streaming protocol used to transfer unicast data in Windows Media Services (previously called NetShow Services). MMS can be transported via UDP or TCP. The MMS default port is UDP/TCP 1755.

Microsoft deprecated MMS in favor of RTSP (TCP/UDP port 554) in 2003 with the release of the Windows Media Services 9 Series, but continued to support the MMS for some time in the interest of backwards compatibility. Support for the protocol was finally dropped in Windows Media Services 2008[1].

Note however that Microsoft still recommends[1] using "mms://" as a "protocol rollover[2] URL". As part of protocol rollover a Windows Media Player version 9, 10, or 11 client opening an "mms://" URL will attempt to connect first with RTSP over UDP and if that fails it will attempt RTSP over TCP. After an RTSP attempt fails, Windows Media Player versions 9 & 10 will attempt MMS over UDP, then MMS over TCP[3]. If using Windows Media Player 11 and an RTSP attempt fails, or if using a previous version of Windows Media Player and MMS fails, a modified version of a HTTP over TCP connection will be attempted. This modified version is referred to by some third parties as MMSH[4], and by Microsoft as MS-WMSP (Windows Media HTTP Streaming Protocol)[5].

For several years, developers of the SDP Multimedia download tool reverse engineered the MMS protocol and published an unofficial documentation for it, until Microsoft finally released the protocol specification in February 2008.[6]

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