公开(公告)号：US08510107B2

公开(公告)日：2013-08-13

申请号：US12620762

申请日：2009-11-18

申请人： Robert S. Nemiroff ,  Jing Yang Chen ,  Siu-Wai Wu

发明人： Robert S. Nemiroff ,  Jing Yang Chen ,  Siu-Wai Wu

IPC分类号： G10L21/04

CPC分类号： G10L19/24 ,  G10L19/167 ,  H04N21/4341 ,  H04N21/4394

摘要： A detector for determining an audio data bit rate of a pre-compressed audio elementary stream (AES), in which the pre-compressed AES includes a plurality of preamble length fields is provided. The detector includes an analyzer module configured to determine one or more candidate audio data bit rates of the AES from the plurality of preamble length fields, a detector module configured to determine whether one or more of the candidate audio data bit rates are correct, and a selector module configured to select one of the one or more candidate audio data bit rates determined to be correct as the audio data bit rate of the pre-compressed AES.

摘要翻译： 一种用于确定预压缩音频基本流（AES）的音频数据比特率的检测器，其中预压缩AES包括多个前同步码长度字段。 检测器包括：分析器模块，被配置为从多个前导码长度字段确定AES的一个或多个候选音频数据比特率;检测器模块，被配置为确定候选音频数据比特率中的一个或多个是否正确;以及 选择器模块，被配置为选择被确定为正确的一个或多个候选音频数据比特率中的一个作为预压缩AES的音频数据比特率。

公开(公告)号：US20110119064A1

公开(公告)日：2011-05-19

申请号：US12620762

申请日：2009-11-18

申请人： Robert S. Nemiroff ,  Jing Yang Chen ,  Siu-Wai Wu

发明人： Robert S. Nemiroff ,  Jing Yang Chen ,  Siu-Wai Wu

IPC分类号： G10L19/00

CPC分类号： G10L19/24 ,  G10L19/167 ,  H04N21/4341 ,  H04N21/4394

摘要： A detector for determining an audio data bit rate of a pre-compressed audio elementary stream (AES), in which the pre-compressed AES includes a plurality of preamble length fields is provided. The detector includes an analyzer module configured to determine one or more candidate audio data bit rates of the AES from the plurality of preamble length fields, a detector module configured to determine whether one or more of the candidate audio data bit rates are correct, and a selector module configured to select one of the one or more candidate audio data bit rates determined to be correct as the audio data bit rate of the pre-compressed AES.

摘要翻译： 一种用于确定预压缩音频基本流（AES）的音频数据比特率的检测器，其中预压缩AES包括多个前同步码长度字段。 检测器包括：分析器模块，被配置为从多个前导码长度字段确定AES的一个或多个候选音频数据比特率;检测器模块，被配置为确定候选音频数据比特率中的一个或多个是否正确;以及 选择器模块，被配置为选择被确定为正确的一个或多个候选音频数据比特率中的一个作为预压缩AES的音频数据比特率。

公开(公告)号：US06731685B1

公开(公告)日：2004-05-04

申请号：US09665373

申请日：2000-09-20

申请人： Vincent Liu ,  Siu-Wai Wu ,  Hanson On ,  Robert S. Nemiroff ,  Michael Casteloes ,  Jing Yang Chen ,  Rebecca Lam

发明人： Vincent Liu ,  Siu-Wai Wu ,  Hanson On ,  Robert S. Nemiroff ,  Michael Casteloes ,  Jing Yang Chen ,  Rebecca Lam

IPC分类号： H04N712

CPC分类号： H04N21/4344 ,  H04J3/1688 ,  H04N19/115 ,  H04N19/137 ,  H04N19/14 ,  H04N19/159 ,  H04N19/172 ,  H04N19/196 ,  H04N19/198 ,  H04N19/577 ,  H04N19/61 ,  H04N21/23608 ,  H04N21/2365 ,  H04N21/23655 ,  H04N21/4347

摘要： A statistical multiplexer for coding and multiplexing multiple channels of digital television data, or multiple panels of HDTV digital television data. A bit rate need parameter is determined for each encoder in a stat mux group by scaling the complexities of previous pictures of the same and different picture types. Scaling factors based on an activity level, motion estimation score, and number of pictures of a certain type in a GOP, may be used. Moreover, the scaling factors may be bounded based on a linear or non-linear operator to prevent large variations in the factors. An encoding bit rate is allocated to each channel based on its need parameter.

摘要翻译： 用于编码和复用多个数字电视数据的多路复用器，或多个HDTV数字电视数据面板。 通过缩放相同和不同图像类型的以前图像的复杂度，在统计复用组中为每个编码器确定比特率需求参数。 可以使用基于活动水平，运动估计得分和GOP中某种类型的图片数量的缩放因子。 此外，缩放因子可以基于线性或非线性算子来限制，以防止因素中的大的变化。 根据其需要参数将编码比特率分配给每个信道。

公开(公告)号：US20130064308A1

公开(公告)日：2013-03-14

申请号：US13232557

申请日：2011-09-14

申请人： Robert S. Nemiroff ,  Jing Yang Chen ,  Rebecca Lam ,  Brenda L. Van Veldhuisen ,  Siu-Wai Wu

发明人： Robert S. Nemiroff ,  Jing Yang Chen ,  Rebecca Lam ,  Brenda L. Van Veldhuisen ,  Siu-Wai Wu

IPC分类号： H04N7/54

CPC分类号： H04N21/23439 ,  H04N21/8456 ,  H04N21/8547

摘要： Coding may include receiving a source video bitstream including source frames and determining information from the source frames. The determined information may include timing information and grouping information and may be utilized in encoding synchronizing processed frames for a synchronized compressed video bitstream. Decoding may include receiving a synchronized compressed video bitstream including the encoding synchronizing processed frames. The decoding may include preparing video chunk files having boundaries defined by the encoding synchronizing processed frames and decoding the prepared video chunk files.

摘要翻译： 编码可以包括接收包括源帧的源视频比特流和从源帧确定信息。 确定的信息可以包括定时信息和分组信息，并且可以用于对同步的压缩视频比特流进行同步处理的帧的编码。 解码可以包括接收包括编码同步处理帧的同步压缩视频比特流。 解码可以包括准备具有由编码同步处理的帧定义的边界的视频块文件，并且解码准备的视频块文件。

公开(公告)号：US06847656B1

公开(公告)日：2005-01-25

申请号：US09669517

申请日：2000-09-25

申请人： Siu-Wai Wu ,  Robert S. Nemiroff ,  Vincent Liu ,  Ajay Luthra

发明人： Siu-Wai Wu ,  Robert S. Nemiroff ,  Vincent Liu ,  Ajay Luthra

IPC分类号： H04N7/26 ,  H04N7/50 ,  H04N21/236 ,  H04N21/2365 ,  H04B1/66

CPC分类号： H04N21/23608 ,  H04N19/115 ,  H04N19/126 ,  H04N19/15 ,  H04N19/152 ,  H04N19/176 ,  H04N19/196 ,  H04N19/197 ,  H04N19/40 ,  H04N19/61 ,  H04N21/23655

摘要： An efficient statistical remultiplexer for processing a number of channels that include video data. In one aspect, transcoding of the video data is delayed while statistical information is obtained from the data. Bit rate need parameters for the data are determined based on the statistical information, and the video data is transcoded based on the respective bit rate need parameters following the delay. In another aspect, a transcoding bit rate for video frames is updated a plurality of times at successive intervals to allow a closer monitoring of the bit rate. Minimum and maximum bounds for the transcoding bit rate, e.g., for buffer overflow and underflow protection, are also updated in each interval. In another aspect, the pre-transcoding quantization scales of the macroblocks in a frame are scaled to provide corresponding new quantization scales for transcoding based on a ratio of a pre-transcoding amount of data in the frame and a target, post-transcoding amount of data for the frame. The quantization scales are adjusted for different portions of the frame as transcoding progresses to ensure that a minimum amount of transcoding bandwidth is allocated to each macroblock.

摘要翻译： 一种用于处理包括视频数据的多个信道的有效统计再分集器。 在一个方面，视频数据的代码转换被延迟，同时从数据中获得统计信息。 基于统计信息确定数据的比特率需要参数，并且根据延迟后的各个比特率需求参数对视频数据进行代码转换。 在另一方面，视频帧的代码转换比特率以连续的间隔多次更新，以允许更仔细地监视比特率。 代码转换比特率的最小和最大限制，例如用于缓冲区溢出和下溢保护，也在每个间隔中被更新。 在另一方面，对帧中的宏块进行预先转码的量化尺度进行缩放，以提供相应的新的用于代码转换的量化尺度，其基于帧中的数据的预转码量与目标之间的比率，后转码量 帧的数据。 当代码转换进行时，针对帧的不同部分调整量化尺度，以确保将最小量的代码转换带宽分配给每个宏块。

公开(公告)号：US07675970B2

公开(公告)日：2010-03-09

申请号：US10755429

申请日：2004-01-12

申请人： Robert S. Nemiroff ,  Siu-Wai Wu

发明人： Robert S. Nemiroff ,  Siu-Wai Wu

IPC分类号： H04N7/26 ,  H04N7/12

CPC分类号： H04N19/198 ,  H04N19/115 ,  H04N19/124 ,  H04N19/137 ,  H04N19/14 ,  H04N19/142 ,  H04N19/15 ,  H04N19/159 ,  H04N19/172 ,  H04N19/176 ,  H04N19/18 ,  H04N19/196 ,  H04N19/40 ,  H04N19/48 ,  H04N19/61

摘要： A method and apparatus for processing a bitstream in a digital video transcoder is described. In one example, an adjustment factor is determined that relates a number of bits representing a selected frame defined by the bitstream to a target number of bits for the selected frame. An average spatial activity value among sets of video data is associated with the selected frame. A spatial activity value for a selected set of the sets of video data is determined. A normalized spatial, activity value for the selected set of frequency video data is then computed in response to the average spatial activity value, the spatial activity value, and a function of the adjustment factor. Target bit reduction for each of the sets of video data may be computed using a function of the normalized spatial activity value and the adjustment factor.

摘要翻译： 描述了一种在数字视频代码转换器中处理位流的方法和装置。 在一个示例中，确定将表示由比特流定义的所选帧的比特数的数目与所选择的帧的目标比特数相关联的调整因子。 视频数据组中的平均空间活动值与所选择的帧相关联。 确定所选择的一组视频数据的空间活动值。 然后响应于平均空间活动值，空间活动值和调整因子的函数来计算所选择的频率视频数据集合的归一化空间活动值。 可以使用归一化空间活动值和调整因子的函数来计算每组视频数据的目标比特缩减。

公开(公告)号：US06904094B1

公开(公告)日：2005-06-07

申请号：US09665372

申请日：2000-09-20

申请人： Vincent Liu ,  Robert S. Nemiroff ,  Siu-Wai Wu ,  Ajay Luthra ,  Limin Wang

发明人： Vincent Liu ,  Robert S. Nemiroff ,  Siu-Wai Wu ,  Ajay Luthra ,  Limin Wang

IPC分类号： H04N7/26 ,  H04N7/50 ,  H04N7/12 ,  H04N11/02

CPC分类号： H04N19/40 ,  H04N19/156 ,  H04N19/42 ,  H04N19/436 ,  H04N19/61

摘要： An efficient processing system, such as for transcoding video data. In an embodiment that is suitable for single or multiple processor embodiments, a processing mode is set for each input video frame, e.g., as a full transcode mode, which uses motion compensation, a requantization mode, which avoids motion compensation, or a bypass mode. The processing mode selection is based on a number of processing cycles that are available to process a frame, and an expected processing requirement of the frame. The bypass or requantization modes are selected to avoid a buffer overflow of the processor.

摘要翻译： 一种高效的处理系统，例如用于对视频数据进行代码转换。 在适用于单个或多个处理器实施例的实施例中，为每个输入视频帧设置处理模式，例如，使用运动补偿的全代码转换模式，避免运动补偿的再量化模式或旁路模式 。 处理模式选择基于可用于处理帧的多个处理周期以及帧的预期处理要求。 选择旁路或再量化模式以避免处理器的缓冲区溢出。

公开(公告)号：US06724825B1

公开(公告)日：2004-04-20

申请号：US09667734

申请日：2000-09-22

申请人： Robert S. Nemiroff ,  Vincent Liu ,  Siu-Wai Wu

发明人： Robert S. Nemiroff ,  Vincent Liu ,  Siu-Wai Wu

IPC分类号： H04B766

CPC分类号： H04N21/2365 ,  H04N19/40 ,  H04N21/2343 ,  H04N21/23608

摘要： A system for providing an accurate time reference for multiple input and output digital video signals of a transcoder that is particularly suited for use with MPEG data. The multiple streams are synchronized with a single master system time clock at the transcoder. Timing data from the master clock is compared to timing data from packets that are input to the transcoder to determine an offset. In particular, timing data, such as a program clock reference (PCR) field, is recovered from packets of different channels that are input to the transcoder. For each channel, timing data is then provided for packets that are output from the transcoder based on the offset and timing data of the master clock at the respective output times. In particular, the adjusted timing data is determined as a sum of the offset and an associated hardware error, less a delay (PcrSysDly) associated with the transcoder, which includes a lookahead delay and a buffer delay. The associated hardware error represents an error of the master clock and/or a system time clock of an encoder that encoded the particular channel.

摘要翻译： 一种用于为特别适合于与MPEG数据一起使用的代码转换器的多个输入和输出数字视频信号提供精确的时间基准的系统。 多个流与代码转换器的单个主系统时钟同步。 将来自主时钟的定时数据与来自输入到代码转换器的分组的定时数据进行比较以确定偏移。 具体地，诸如程序时钟参考（PCR）字段的定时数据从输入到代码转换器的不同信道的分组中恢复。 对于每个通道，然后基于在相应输出时间的主时钟的偏移和定时数据，从代码转换器输出的分组提供定时数据。 特别地，调整的定时数据被确定为偏移量和相关联的硬件错误的总和，减去与代码转换器相关联的延迟（PcrSysDly），其包括前瞻延迟和缓冲器延迟。 相关联的硬件错误表示编码特定信道的编码器的主时钟和/或系统时钟的错误。

公开(公告)号：US07072402B2

公开(公告)日：2006-07-04

申请号：US10145166

申请日：2002-05-13

申请人： Robert S. Nemiroff ,  Siu-Wai Wu

发明人： Robert S. Nemiroff ,  Siu-Wai Wu

IPC分类号： H04N7/12

CPC分类号： H04N19/517 ,  H04N19/196 ,  H04N19/463 ,  H04N19/51

摘要： The present invention provides methods and apparatus for dynamically adjusting f-codes for a digital picture header of a coded picture. A video encoder having at least one motion estimation stages is provided for encoding the current picture. Motion vectors are determined for one motion estimation stage of the encoder. The motion vectors are analyzed to determine a maximum motion vector range for the picture. A corresponding minimum f-code is determined for the maximum range. The minimum f-code is then inserted into the digital picture header. In this manner, the f-codes carried in the digital picture header can be reduced to the minimum required value, thus reducing the number of bits needed to encode the f-codes.

公开(公告)号：US07068719B2

公开(公告)日：2006-06-27

申请号：US09872783

申请日：2001-06-01

申请人： Vincent Liu ,  Robert S. Nemiroff ,  Siu-Wai Wu

发明人： Vincent Liu ,  Robert S. Nemiroff ,  Siu-Wai Wu

IPC分类号： H04N7/12

CPC分类号： H04N21/23608 ,  H04N21/23424 ,  H04N21/812

摘要： A mechanism for splicing advertisements, local programming and the like into a digital video transport stream is provided. In order to achieve proper splicing, an appropriate number of frames is inserted between bitstreams to properly close a GOP of the first bitstream into which a second bitstream carrying the spliced content is inserted. Program clock references (PCRs) of the bitstreams are adjusted as necessary in order to force continuity between the bitstreams. For inserting advertisements, the PCR of the program stream and ad stream can be tracked, and the PCR of the program stream can be used both before and after splicing. For local program insertion (which are typically substantially longer than advertisements), the PCR of the local program can be used, after adjustment thereof with an offset to maintain continuity at the splice point. The PTS and/or DTS of the inserted bitstream can be modified to keep them continuous at the splice point for both video and audio streams. The spliced bitstream is transcoded to maintain a desired output bit rate, and to provide overflow/underflow protection of the video buffers.