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1. 发明申请

WO2006066889A1 METHOD AND SYSTEM TO MINIMIZE THE SWITCHING DELAY BETWEEN TWO RTP MULTIMEDIA STREAMING SESSIONS 审中-公开
标题翻译：最小化两个RTP多媒体流媒体会话之间的切换延迟的方法和系统
公开(公告)号：WO2006066889A1
公开(公告)日：2006-06-29
申请号：PCT/EP2005/013753
申请日：2005-12-21
申请人： SIEMENS S.P.A. , BACCHI, Alessandro , CAVALERA, Claudio , VANZULLI, Marco , ZERBINI, Massimo
发明人： BACCHI, Alessandro , CAVALERA, Claudio , VANZULLI, Marco , ZERBINI, Massimo
IPC分类号： H04L29/06
CPC分类号： H04L65/605 , H04L29/06027 , H04L65/608
摘要： A communication system includes a pool of multimedia players (MP) in communication with a multimedia server (MS), both the players and the server operating according to the IETF RTSP protocol independently of the used transport network. A new network element called streaming switching processor (SSP) is located between the players and the video-server/video-encoders (ME) for executing the switching of the streaming contents upon a command (NOTIFY) received from the player (MP). Alternatively, the SSP also embodies the funtionality of video server and video encoders. The SSP includes at least M buffers (ch-1, …,ch-M) for an equal number of independent streaming contents kept always on. This architecture enables the SSP while is processing the switching message (NOTIFY) to forward in parallel the switched streaming contents to the player. As a consequence, the player receives the new streaming contents in the context of the first RTSP session. The Switching Delay Time SDT is drastically reduced operating in this way because some typical delays overlap and others are contemporary to SDT. The multimedia contents can be derived from encoded real-time signals, such as satellite TV channels, or registered contents taken from archives. The player is programmed to flush the video/audio MPEG-4 frames out of its receiving buffer and fill up the emptied space with the frames of the relevant auxiliary buffer clocked faster. The further expedient to align the sending in correspondence of a Key-frame followed by a “secure” filled length prevents the artefacts on the displayed image. The switching message is sent by the player either on UDP or TCP; it includes at least the identifier of the request channel, the buffer status inside the Player. Alternatively, a new RTSP message is created including in its body these information fields described according to the RTSP presentation rules.
摘要翻译：通信系统包括与多媒体服务器（MS）通信的多媒体播放器（MP）池，玩家和服务器都根据IETF RTSP协议独立于所使用的传输网络进行操作。称为流交换处理器（SSP）的新的网络元件位于播放器和视频服务器/视频编码器（ME）之间，用于在从播放器（MP）接收到的命令（NOTIFY）上执行流式内容的切换。或者，SSP还体现了视频服务器和视频编码器的功能。 SSP至少包含M个缓冲器（ch-1，ch-M），用于保持始终处于开启状态的相等数目的独立流内容。该架构使得SSP在处理切换消息（NOTIFY）的同时将切换的流内容转发到播放器时。因此，播放器在第一RTSP会话的上下文中接收新的流内容。切换延迟时间SDT以这种方式大大减少操作，因为一些典型的延迟重叠，而其他延迟时间与SDT是现代的。多媒体内容可以从编码的实时信号（例如卫星电视频道）或从归档取得的注册内容导出。播放器被编程为将视频/音频MPEG-4帧从其接收缓冲器中刷新并且填充空闲空间，相关辅助缓冲器的帧的时钟速度更快。对应于按键框后跟“安全”填充长度的发送的进一步方便可防止显示图像上的伪影。切换消息由播放器在UDP或TCP上发送; 它至少包括请求通道的标识符，Player内的缓冲区状态。或者，创建一个新的RTSP消息，在其主体中包括根据RTSP呈现规则描述的这些信息字段。

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