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1.发明授权Switching a client from unicasting to multicasting by simultaneously providing unicast and multicast streams to the client 有权通过向客户端同时提供单播和多播流，将客户端从单播切换到多播公开(公告)号：US08140699B2
公开(公告)日：2012-03-20
申请号：US11361303
申请日：2006-02-23
IPC分类号： G06F15/16
CPC分类号： B32B27/08 , B32B2250/24 , B32B2255/10 , B32B2307/402 , B32B2307/584 , B32B2307/7145 , B32B2451/00 , B44C1/10 , H04L12/1886 , H04L29/06027 , H04L65/4084 , H04L65/4092 , H04N21/4384 , H04N21/44004 , H04N21/6405 , H04N21/6408 , H04N21/64322
摘要： Switching a client from unicasting back to multicasting involves simultaneously providing the digital video content to the client via unicasting and multicasting until the client has buffered duplicate frames (i.e., frames that contain the same digital video content). Once the client has buffered duplicate frames, the client can transition from playing out of a buffer that holds frames received via unicasting to playing out of a buffer that holds frames received via multicasting without skipping a frame. Once the transition back to multicasting is complete, unicasting is terminated and any frames remaining in the unicast buffer are flushed.
摘要翻译： 将客户端从单播切换回多播涉及通过单播和多播向客户端提供数字视频内容，直到客户端缓冲了重复的帧（即，包含相同的数字视频内容的帧）。 一旦客户端缓存了重复的帧，客户端就可以从保持通过单播接收到的帧的缓冲区中跳出到通过多播保存帧而不跳过帧的缓冲器的播放。 一旦转换回组播完成，单播就终止，并且单播缓冲区中剩余的任何帧被刷新。
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公开(公告)号：US20100129056A1
公开(公告)日：2010-05-27
申请号：US12277486
申请日：2008-11-25
CPC分类号： H04N5/91 , G11B27/034 , G11B27/3027 , H04N9/8042 , H04N9/8205
摘要： Techniques are provided to perform seamless or non-seamless ad insertion using a low-complexity process. Delay is introduced into a transport stream to prevent decoder buffer overflow. Delay buildup in the transport stream is reduced by removing pre-identified redundant or near redundant frames. Pre-identification of frames for removal reduces the processing required at the splice points, while maintaining a minimum overall delay in the transport stream.
摘要翻译： 提供技术以使用低复杂度的过程执行无缝或非无缝的广告插入。 将延迟引入到传输流中以防止解码器缓冲区溢出。 通过删除预先识别的冗余或近似冗余帧来减少传输流中的延迟累积。 预先识别用于移除的帧的帧减少了拼接点所需的处理，同时保持传输流中的最小总体延迟。
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公开(公告)号：US6157771A
公开(公告)日：2000-12-05
申请号：US947646
申请日：1997-10-09
申请人： Eric T. Brewer , Andrew Palfreyman
发明人： Eric T. Brewer , Andrew Palfreyman
CPC分类号： G11B27/036 , G11B2220/20 , G11B2220/2512 , H04N5/781 , H04N5/783 , H04N9/8042
摘要： Disclosed are methods and apparatuses for seeking within audiovisual files. A seeking engine is implemented to efficiently locate target video frames without having to laboriously decode and index each and every video frame in an audiovisual file. Further, a seeking engine is capable of frame accurately determining the number of frames in a video file by identifying the last GOP header in the video file, and then identifying a last video frame in the file. The last video frame in the file is identified by reading each video frame's picture header (i.e., within the last GOP) and determining which picture header produces a larger temporal reference number. The video frame having the largest temporal number is therefore the last video frame in the video file. In addition, the seeking engine is capable of associating an identified video frame with a closest audio frame to complete an audio-to-video seek.
摘要翻译： 公开了用于在视听文件中寻找的方法和装置。 实现搜索引擎以有效地定位目标视频帧，而不必费力地解码和索引视听文件中的每个视频帧。 此外，搜索引擎能够通过识别视频文件中的最后GOP头，然后识别文件中的最后一个视频帧，来帧准确地确定视频文件中的帧数。 文件中的最后一个视频帧通过读取每个视频帧的图像头部（即，在最后一个GOP内）并确定哪个图像头部产生较大的时间参考数来识别。 因此，具有最大时间编号的视频帧是视频文件中的最后一个视频帧。 此外，搜索引擎能够将识别的视频帧与最接近的音频帧相关联，以完成音频到视频搜索。
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4.发明授权Switching a client from unicasting to multicasting by increasing the unicast stream rate to the client 有权通过将单播流速率增加到客户端，将客户端从单播切换到多播公开(公告)号：US07788393B2
公开(公告)日：2010-08-31
申请号：US11360080
申请日：2006-02-23
IPC分类号： G06F15/16
CPC分类号： H04L65/4076 , H04L12/185 , H04L12/1863 , H04L65/4084 , H04L65/4092 , H04L65/80 , H04N21/23406 , H04N21/238 , H04N21/23805 , H04N21/26616 , H04N21/2668 , H04N21/4384 , H04N21/44004 , H04N21/44016 , H04N21/44222 , H04N21/6405 , H04N21/6408
摘要： Switching a client from unicasting back to multicasting involves accumulating enough digital video content at the client to bridge the time it takes to transition from receiving the digital video content via unicasting to receiving the digital video content via multicasting. Digital video content is accumulated at the client by temporarily increasing the stream rate of the unicast stream above the playout rate. While the digital video content is being streamed at the increased rate, the amount of digital video content stored in the client's stream buffer grows. The stream rate is held at the increased rate until the client accumulates enough frames in its buffer to be able to bridge the time it takes to transition from receiving the digital video content via unicasting to receiving the digital video content via multicasting.
摘要翻译： 将客户端从单播切换到多播包括在客户端上累积足够的数字视频内容以弥合从通过单播接收数字视频内容转换到通过多播接收数字视频内容所需的时间。 数字视频内容通过临时增加播放速率以上的单播流的流速度而在客户端处累积。 当数字视频内容以增加的速率流式传输时，存储在客户端流缓冲器中的数字视频内容的数量增加。 流率以增加的速率保持，直到客户端在其缓冲器中累积足够的帧，以便能够跨越通过单播从接收数字视频内容转换到通过多播接收数字视频内容所需的时间。
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公开(公告)号：US20090320084A1
公开(公告)日：2009-12-24
申请号：US12141362
申请日：2008-06-18
IPC分类号： H04N7/173
CPC分类号： H04N7/17318 , H04N21/23424 , H04N21/26616 , H04N21/44016 , H04N21/812
摘要： A technique for providing program restart functionality in a digital video network involves receiving requests from different end-user devices to restart a program and servicing the program restart requests from the different end-user devices via a single broadcast stream. In an embodiment, program restart requests that are received within an established time interval, referred to as an aggregation interval, are serviced by the same broadcast stream. Additionally, during the aggregation interval and before the program restart begins, personalized content can be provided to the end-user devices via, for example, unicasting. Once the aggregation interval is over, all of the unicast streams are switched over to the same broadcast stream and the program broadcast is restarted. In an embodiment, a switch buffer is provided just before the restarted broadcast stream in order to ensure a smooth transition from each of the multiple unicast streams to the restarted broadcast stream.
摘要翻译： 用于在数字视频网络中提供节目重启功能的技术涉及从不同的最终用户设备接收请求以重新启动节目，并且通过单个广播流来服务来自不同终端用户设备的节目重启请求。 在一个实施例中，在所建立的时间间隔内被接收的称为聚合间隔的程序重启请求由相同的广播流服务。 此外，在聚合间隔期间和在程序重新开始之前，可以通过例如单播来向最终用户设备提供个性化内容。 一旦聚合间隔结束，所有单播流都将切换到相同的广播流，并重新启动程序广播。 在一个实施例中，在重新启动的广播流之前提供切换缓冲器，以便确保从多个单播流中的每一个到重新启动的广播流的平滑过渡。
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公开(公告)号：US20090193454A1
公开(公告)日：2009-07-30
申请号：US12022099
申请日：2008-01-29
CPC分类号： G11B27/3027 , G11B27/036 , H04N21/23424 , H04N21/234318 , H04N21/23608 , H04N21/4307 , H04N21/4344 , H04N21/44008 , H04N21/44016 , H04N21/812 , H04N21/8455 , H04N21/8547
摘要： In one embodiment, a network device analyzes an encoded stream to identify a timing value included in a packet before a splice point. Next, the device determines a difference between identified timing value and a timing value included in a packet of the encoded segment to be spliced. In conjunction with splicing, the network device formats timing values of packets according to the determined difference, which improves play out of the spliced stream.
摘要翻译： 在一个实施例中，网络设备分析编码流以识别在拼接点之前的分组中包括的定时值。 接下来，设备确定所识别的定时值与包括在要拼接的编码片段的分组中的定时值之间的差异。 结合拼接，网络设备根据确定的差异来格式化分组的定时值，这改善了拼接流的播放。
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7.发明申请Switching a client from unicasting to multicasting by simultaneously providing unicast and multicast streams to the client 有权通过向客户端同时提供单播和多播流，将客户端从单播切换到多播公开(公告)号：US20060200576A1
公开(公告)日：2006-09-07
申请号：US11361303
申请日：2006-02-23
申请人： John Pickens , Kirk Blattman , Glenn Connery , Andrew Palfreyman , W. Sherer
发明人： John Pickens , Kirk Blattman , Glenn Connery , Andrew Palfreyman , W. Sherer
IPC分类号： G06F15/16
CPC分类号： B32B27/08 , B32B2250/24 , B32B2255/10 , B32B2307/402 , B32B2307/584 , B32B2307/7145 , B32B2451/00 , B44C1/10 , H04L12/1886 , H04L29/06027 , H04L65/4084 , H04L65/4092 , H04N21/4384 , H04N21/44004 , H04N21/6405 , H04N21/6408 , H04N21/64322
摘要： Switching a client from unicasting back to multicasting involves simultaneously providing the digital video content to the client via unicasting and multicasting until the client has buffered duplicate frames (i.e., frames that contain the same digital video content). Once the client has buffered duplicate frames, the client can transition from playing out of a buffer that holds frames received via unicasting to playing out of a buffer that holds frames received via multicasting without skipping a frame. Once the transition back to multicasting is complete, unicasting is terminated and any frames remaining in the unicast buffer are flushed.
摘要翻译： 将客户端从单播切换回多播涉及通过单播和多播向客户端提供数字视频内容，直到客户端缓冲了重复的帧（即，包含相同的数字视频内容的帧）。 一旦客户端缓存了重复的帧，客户端就可以从保持通过单播接收到的帧的缓冲区中跳出到通过多播保存帧而不跳过帧的缓冲器的播放。 一旦转换回组播完成，单播就终止，并且单播缓冲区中剩余的任何帧被刷新。
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公开(公告)号：US06661430B1
公开(公告)日：2003-12-09
申请号：US08947844
申请日：1997-10-09
IPC分类号： H04N593
CPC分类号： G11B27/034
摘要： Disclosed is a method for copying a segment from an audiovisual file having a multiplicity of audio frames and a multiplicity of video frames. In a first step, a mark-in location in a video file is selected to correspond to a first video frame in the segment such that the first video frame has an associated start time. Next, a mark-out location in the video file is selected to correspond to a last video frame in the segment, and the last video frame having an associated end time. Once the mark-in video frame is selected, a first audio frame having a first audio frame start time that is at least as early as the first video frame start time is designated as an initial audio frame. A second audio frame having a second audio frame start time that is at least as late as the last video frame end time is designated as the last audio frame. The audiovisual file is copied to include a video portion extending from the first video frame to the last video frame and an audio portion extending from the initial audio frame to the last audio frame. In this manner, the audio portion of the segment may preferably be longer than the video portion of the copied segment.
摘要翻译： 公开了一种用于从具有多个音频帧和多个视频帧的视听文件复制片段的方法。 在第一步骤中，选择视频文件中的标记位置以对应于片段中的第一视频帧，使得第一视频帧具有相关联的开始时间。 接下来，选择视频文件中的标记位置以对应于片段中的最后一个视频帧，并且最后一个视频帧具有相关联的结束时间。 一旦选择了标记视频帧，具有至少早于第一视频帧开始时间的第一音频帧开始时间的第一音频帧被指定为初始音频帧。 具有至少与最后一个视频帧结束时间一样晚的第二音频帧开始时间的第二音频帧被指定为最后一个音频帧。 视听文件被复制为包括从第一视频帧延伸到最后视频帧的视频部分和从初始音频帧延伸到最后一个音频帧的音频部分。 以这种方式，片段的音频部分可以优选地比复制片段的视频部分长。
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9.发明授权公开(公告)号：US06285361B1
公开(公告)日：2001-09-04
申请号：US08948352
申请日：1997-10-09
IPC分类号： G06F300
CPC分类号： G11B27/036
摘要： Disclosed is a method for clipping a segment from a video file having a multiplicity of video frames. Preferably, at least some of the frames in the video file are encoded as predicted frames. The method includes selecting a mark-in location in the video file that defines the beginning of the clipped segment. A mark-out location defining the end of the clipped segment is also selected in the video file. Once the mark-in and mark-out locations are selected, the method decodes a first frame associated with one of the mark-in location and the mark-out location. The first frame is preferably a predictive frame that has an associated first format. The first frame is then re-encoded into a second format and stored. The method then proceeds to create a clipped segment that includes the re-encoded first frame.
摘要翻译： 公开了一种用于从具有多个视频帧的视频文件中剪辑段的方法。 优选地，视频文件中的至少一些帧被编码为预测帧。 该方法包括选择视频文件中的标记位置，该位置定义剪辑段的开始。 也会在视频文件中选择定义剪辑片段结束的标记位置。 一旦选择了注入和标记位置，该方法解码与标记位置和标记位置之一相关联的第一帧。 第一帧优选地是具有相关联的第一格式的预测帧。 然后将第一帧重新编码为第二格式并存储。 然后，该方法继续创建包括重新编码的第一帧的限幅段。
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公开(公告)号：US08201204B2
公开(公告)日：2012-06-12
申请号：US12533197
申请日：2009-07-31
CPC分类号： H04N5/76 , G11B27/28 , H04N5/765 , H04N9/8205 , H04N21/4334 , H04N21/44008 , H04N21/44016 , H04N21/812
摘要： Black video segments in a video playlist may be minimized. Black detection may be utilized by a network device to identify true starting point and a true ending point of a video asset which includes black video segments in the playlist. Locations associated with the true starting and ending points may be recorded in metadata associated with the video asset. New black video segments may be added at the beginning and at the end of the playlist. Playback of the playlist may then be initiated to play the video asset only between the recorded location associated with the true starting point and the recorded location associated with the true ending point at the network device thereby minimizing the black video segments in the video asset.
摘要翻译： 视频播放列表中的黑色视频片段可能被最小化。 网络设备可以利用黑色检测来识别包括播放列表中的黑色视频段的视频资产的真实起始点和真实终点。 与真实起点和终点相关联的位置可以记录在与视频资产相关联的元数据中。 新的黑色视频片段可能会在播放列表的开头和结尾添加。 然后可以启动播放列表的播放，以仅在与真实起点相关联的记录位置和与网络设备处的真实终点相关联的记录位置之间播放视频资产，从而最小化视频资产中的黑色视频段。
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