公开(公告)号：US20150023404A1

公开(公告)日：2015-01-22

申请号：US13943445

申请日：2013-07-16

Applicant: Cisco Technology, Inc.

Inventor： Zhi Li ,  Ali C. Begen ,  Joshua B. Gahm ,  Bruce P. Osler ,  David R. Oran

IPC: H04N19/189 ,  H04N19/152

CPC classification number: H04N19/189 ,  H04L65/4084 ,  H04L65/80 ,  H04N19/152

Abstract: Techniques are provided for optimizing quality in adaptive streaming, where information is obtained relating to encoding bitrates and content quality scores for content segments of a content stream. The content segments of the content stream are provided by a content server and downloaded by a computing device. For each content segment, an encoding bitrate is determined for downloading the content segment from the content server, where determining the encoding bitrate for a current content segment is based upon an estimated current network bandwidth, constraints of a buffer into which downloaded content segments are stored, and also upon quality scores associated with content segments within a selected horizon extending from the current content segment to a future content segment in the content stream at an endpoint of the horizon. Each content segment with the determined bitrate for the content segment is downloaded from the content server.

Abstract translation: 提供了用于优化自适应流中的质量的技术，其中获得与内容流的内容段的编码比特率和内容质量得分有关的信息。 内容流的内容片段由内容服务器提供并由计算设备下载。 对于每个内容段，确定用于从内容服务器下载内容片段的编码比特率，其中确定当前内容片段的编码比特率是基于估计的当前网络带宽，存储下载的内容片段的缓冲器的约束 以及与在当前视域内的内容片段中的内容片段相关联的质量分数，其从当前内容片段延伸到视频端点处的内容流中的未来内容片段。 从内容服务器下载具有内容片段的确定的比特率的每个内容片段。

公开(公告)号：US20180035140A1

公开(公告)日：2018-02-01

申请号：US15728681

申请日：2017-10-10

Applicant: Cisco Technology, Inc.

Inventor： Zhi Li ,  Joshua B. Gahm ,  Xiaoqing Zhu

IPC: H04N21/2343 ,  H04N21/647 ,  H04N21/2385 ,  H04N21/238 ,  H04L29/06 ,  H04N21/845 ,  H04N21/2662 ,  H04L12/825

CPC classification number: H04N21/234381 ,  H04L47/25 ,  H04L65/602 ,  H04L65/605 ,  H04L65/80 ,  H04N21/23439 ,  H04N21/23805 ,  H04N21/2385 ,  H04N21/2662 ,  H04N21/64769 ,  H04N21/8456

Abstract: Various implementations disclosed herein enable a more efficient allocation of one or more shared network resources (e.g., bandwidth, memory, processor time, etc.) amongst a number of client devices based on media content data complexity and client device resource constraints in order to better manage perceptual playback quality of adaptive streaming content. In some implementations, a method includes aligning sequences of one or more temporal segments such that time boundaries of temporal segments across the sequences are in alignment; and, selecting segment representations for each temporal segment based on a combination of the sequence alignment and perceptual quality level values associated with available segment representations, such that a combination of resulting perceptual quality levels satisfies a joint quality criterion. Each sequence is associated with a respective one of a number of client devices sharing a network resource and an instance of a respective video stream. The one or more temporal segments of each sequence are used to provide segment representations of media content data to one of the client devices. The alignment of time boundaries of temporal segments is achieved at least in part by adjusting performance characteristics associated with at least some of the one or more temporal segments.

公开(公告)号：US09426478B2

公开(公告)日：2016-08-23

申请号：US14336246

申请日：2014-07-21

Applicant: Cisco Technology Inc.

Inventor： Zhi Li ,  Josh Gahm

IPC: H04N19/00 ,  H04N19/36 ,  H04N19/86 ,  H04N17/00 ,  H04N19/154

CPC classification number: H04N19/36 ,  H04N17/004 ,  H04N19/154 ,  H04N19/86

Abstract: In one embodiment, a video processing system includes a processor to read a mapping between a peak signal to noise ratio, PSNR, and a video quality metric, M, for an encoded version of a first video portion encoded at full resolution Rmax, read an up-sampled peak signal to noise ratio, uPSNR(Rx) of an up-sampled decoded video portion deriving from the first video portion being encoded at a resolution Rx, which is less than the full resolution Rmax, yielding an encoded video portion, the encoded video portion being decoded and then up-sampled to the full resolution Rmax; and lookup a value, V′, that maps to uPSNR(Rx) in the mapping, V′ representing a resolution normalized M value of the encoded video portion encoded at the resolution Rx. Related apparatus and methods are also described.

Abstract translation: 在一个实施例中，视频处理系统包括处理器，用于读取在全分辨率Rmax编码的第一视频部分的编码版本的峰值信噪比PSNR和视频质量度量M之间的映射，读取 上采样的峰值信噪比，从第一视频部分导出的上采样解码视频部分的uPSNR（Rx）以小于全分辨率Rmax的分辨率Rx进行编码，产生编码视频部分， 编码视频部分被解码，然后被上采样到全分辨率Rmax; 并且在映射中查找映射到uPSNR（Rx）的值V'，V'表示在分辨率Rx处编码的编码视频部分的分辨率归一化的M值。 还描述了相关装置和方法。

公开(公告)号：US20140321274A1

公开(公告)日：2014-10-30

申请号：US13873589

申请日：2013-04-30

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Joshua B. Gahm ,  David R. Oran ,  Zhi Li ,  Rong Pan

IPC: H04L12/851 ,  H04L12/927 ,  H04L12/823

CPC classification number: H04L47/805 ,  H04L47/193 ,  H04L47/2408 ,  H04L47/31 ,  H04L47/32 ,  H04L47/326

Abstract: A method is provided in one example embodiment and includes generating a transmission control protocol (TCP) flow; marking a plurality of packets of the TCP flow with one of two differentiated services code points (DSCPs) according to a proportion that is selected to control a throughput associated with the TCP flow; and communicating at least a portion of the plurality of packets to a network.

Abstract translation: 在一个示例实施例中提供了一种方法，并且包括生成传输控制协议（TCP）流; 根据被选择用于控制与TCP流相关联的吞吐量的比例，将两个差分服务码点（DSCP）中的一个标记为TCP流的多个分组; 以及将所述多个分组的至少一部分传送到网络。

公开(公告)号：US10419787B2

公开(公告)日：2019-09-17

申请号：US15728681

申请日：2017-10-10

Applicant: Cisco Technology, Inc.

Inventor： Zhi Li ,  Joshua B. Gahm ,  Xiaoqing Zhu

IPC: H04N21/2343 ,  H04L29/06 ,  H04N21/238 ,  H04N21/2385 ,  H04N21/2662 ,  H04N21/647 ,  H04N21/845 ,  H04L12/825

Abstract: Various implementations disclosed herein enable a more efficient allocation of one or more shared network resources (e.g., bandwidth, memory, processor time, etc.) amongst a number of client devices based on media content data complexity and client device resource constraints in order to better manage perceptual playback quality of adaptive streaming content. In some implementations, a method includes aligning sequences of one or more temporal segments such that time boundaries of temporal segments across the sequences are in alignment; and, selecting segment representations for each temporal segment based on a combination of the sequence alignment and perceptual quality level values associated with available segment representations, such that a combination of resulting perceptual quality levels satisfies a joint quality criterion. Each sequence is associated with a respective one of a number of client devices sharing a network resource and an instance of a respective video stream. The one or more temporal segments of each sequence are used to provide segment representations of media content data to one of the client devices. The alignment of time boundaries of temporal segments is achieved at least in part by adjusting performance characteristics associated with at least some of the one or more temporal segments.

公开(公告)号：US09521177B2

公开(公告)日：2016-12-13

申请号：US14024210

申请日：2013-09-11

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Joshua B. Gahm ,  Aimin Ding ,  Rong Pan ,  Zhi Li

IPC: G06F15/16 ,  H04L29/06 ,  H04L12/801

CPC classification number: H04L65/601 ,  H04L47/11

Abstract: An apparatus can include a session rate limit calculator and a rate limiter. The session rate limit calculator can be configured to compute a session rate limit for a given session of a plurality of active streaming media sessions based on state information for the given session and state information for a downstream bottleneck link to which the apparatus feeds the plurality of active streaming media sessions. The rate limiter can be configured to control downstream traffic for the given session based on the computed session rate limit and to provide corresponding rate-limited downstream traffic for the given session.

Abstract translation: 装置可以包括会话速率限制计算器和速率限制器。 会话速率限制计算器可以被配置为基于给定会话的状态信息来计算多个活动流媒体会话的给定会话的会话速率限制，以及用于下一个瓶颈链路的状态信息，该设备将多个 主动流媒体会话。 速率限制器可以被配置为基于计算的会话速率限制来控制给定会话的下行流量，并且为给定会话提供对应的速率受限的下行流量。