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    • 44. 发明授权
    • System and method of providing video content
    • 提供视频内容的系统和方法
    • US08813141B2
    • 2014-08-19
    • US11891056
    • 2007-08-08
    • Kadangode RamakrishnanCharles Robert Kalmanek, Jr.Robert Duncan DoverspikeWilliam C. Fenner
    • Kadangode RamakrishnanCharles Robert Kalmanek, Jr.Robert Duncan DoverspikeWilliam C. Fenner
    • H04N7/173H04N21/438
    • H04N21/23106H04N7/162H04N21/236H04N21/2625H04N21/4384H04N21/6405H04N21/8453
    • A method of providing video content is disclosed that includes receiving video content associated with a television stream from a video source at a server of a video distribution network. The method also includes sending a primary multicast video stream corresponding to the video content to a video distribution network entity via an Internet Protocol (IP) network. The primary multicast video stream is associated with a first bandwidth. Further, the method includes sending a secondary multicast video stream to the video distribution network entity via the IP network. The secondary multicast video stream is associated with a second bandwidth. The primary multicast video stream and the secondary multicast video stream are accessible to a set-top box device via the video distribution network entity in response to a channel change request that indicates the television stream. In addition, the frames of the secondary multicast video stream may be delayed with respect to their counterparts in the primary multicast video stream. This insures that, after sufficient buffering of frames of the primary multicast video stream, when the set-top box device switches from the secondary multicast video stream to the primary multicast video stream there will be no noticeable time shift.
    • 公开了一种提供视频内容的方法,包括从视频分发网络的服务器处的视频源接收与电视流相关联的视频内容。 该方法还包括经由因特网协议(IP)网络向视频分配网络实体发送对应于视频内容的主要多播视频流。 主要多播视频流与第一带宽相关联。 此外,该方法包括经由IP网络向视频分配网络实体发送次要多播视频流。 次要多播视频流与第二带宽相关联。 响应于指示电视流的频道改变请求,主要多播视频流和次要多播视频流可经由视频分配网络实体对机顶盒设备进行访问。 此外,次要多播视频流的帧可以相对于主要多播视频流中的对应物而被延迟。 这确保了在主要多播视频流的帧充分缓冲之后,当机顶盒设备从次要多播视频流切换到主要多播视频流时,将不会有明显的时间偏移。