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    • 83. 发明授权
    • Methods and apparatus to evaluate statistical remultiplexer performance
    • 评估统计重新多路复用器性能的方法和装置
    • US07173947B1
    • 2007-02-06
    • US09998546
    • 2001-11-28
    • Sangeeta RamakrishnanFang WuXiaomei Liu
    • Sangeeta RamakrishnanFang WuXiaomei Liu
    • H04J3/02H04J1/16H04J3/14
    • H04N21/4347H04J3/14H04J3/1682H04N21/23418H04N21/23608H04N21/2365H04N21/23655
    • The present invention relates to methods and apparatus for quantitatively measuring the performance of a statistical remultiplexer. The methods of the present invention provide for generation of evaluation metrics associated with at least one of amount of bit rate reduction performed by the statistical remultiplexer, change in video quality attributable to the statistical remultiplexer, wasted output bandwidth by the statistical remultiplexer, decoder buffer level fullness, bit rate reduction characteristics of the statistical remultiplexer, and time delay attributable to the statistical remultiplexer.The methods of the present invention may be implemented by an evaluator that may be incorporated into a statistical remultiplexer or may be separate from and connectable to a statistical remultiplexer.
    • 本发明涉及用于定量测量统计再多路复用器的性能的方法和装置。 本发明的方法提供了与由统计重用多路复用器执行的比特率降低量中的至少一个相关联的评估度量的产生,归因于统计重用多路复用器的视频质量的改变,由统计再多路复用器浪费的输出带宽,解码器缓冲器级 统计复用多路复用器的饱和度,比特率降低特性以及归因于统计复用多路复用器的时间延迟。 本发明的方法可以由可以并入统计再多路复用器中的评估器来实现,或者可以与统计再多路复用器分开并且可以连接到统计再多路复用器。
    • 85. 发明授权
    • System and method for transcoding multiple channels of compressed video streams using a self-contained data unit
    • 使用自包含数据单元对压缩视频流的多个通道进行代码转换的系统和方法
    • US06751259B2
    • 2004-06-15
    • US10270852
    • 2002-10-11
    • Ji ZhangScott StovallFang WuYitong Tse
    • Ji ZhangScott StovallFang WuYitong Tse
    • H04N718
    • H04N21/23608H04N19/40H04N21/234309H04N21/2365H04N21/23655H04N21/4347
    • A system for transcoding multiple channels of compressed video streams using a self contained data unit such as an autonomous frame includes an autonomous frame processing unit having an autonomous frame generator and an autonomous frame recoder. The autonomous frame generator receives video data and divides it into a series of autonomous frames. Each autonomous frame preferably comprises 1) a frame header including all header information from the original video data plus enough additional information to allow the frame to be recoded using pre-defined autonomous frame structure, and 2) a frame payload including the original video data information. The autonomous frame recoder process the autonomous frames including extracting processing parameters, extracting the video data and setting up or initializing the recoder to process the extracted video data. The autonomous frame recoder preferably further comprises a parser coupled to an initialization unit and a recoder. The present invention also includes a method for processing video data including the steps of: receiving a video bitstream, storing recoding information, dividing the video bitstream into a plurality of autonomous frames each frame including a portion of the video bitstream and recoding information, outputting the plurality of autonomous frames, receiving the plurality of autonomous frames, extracting processing information from the autonomous frame, extracting video data from the autonomous frame, setting the recoding according to the processing information and recoding the extracted video data.
    • 使用诸如自主帧的自包含数据单元对多个压缩视频流的多个信道进行代码转换的系统包括具有自主帧生成器和自主帧记录器的自主帧处理单元。 自主帧生成器接收视频数据并将其分成一系列自主帧。 每个自主帧优选地包括1)包括来自原始视频数据的所有报头信息的帧报头加上足够的附加信息以允许使用预定义的自主帧结构来重新编码帧,以及2)包括原始视频数据信息的帧有效载荷 。 自主帧重新编码器处理包括提取处理参数,提取视频数据以及建立或初始化编码器的自主帧以处理所提取的视频数据。 自主帧记录器优选地还包括耦合到初始化单元和记录器的解析器。 本发明还包括一种处理视频数据的方法,包括以下步骤:接收视频比特流,存储重新编码信息,将视频比特流分成多个自主帧,每个帧包括视频比特流的一部分和重新编码信息,输出 多个自主帧,接收多个自主帧,从自主帧提取处理信息,从自主帧中提取视频数据,根据处理信息设置重新编码,并重新编码提取的视频数据。