公开(公告)号：US20140337903A1

公开(公告)日：2014-11-13

申请号：US13958477

申请日：2013-08-02

Applicant: BROADCOM CORPORATION

Inventor： Hongtao Zhu ,  Alexander Garland Macinnis

IPC: H04N21/235 ,  H04N21/6587 ,  H04N19/40

CPC classification number: H04N21/6587 ,  H04N19/40 ,  H04N21/2187 ,  H04N21/234336 ,  H04N21/23439 ,  H04N21/2387 ,  H04N21/242 ,  H04N21/8456 ,  H04N21/85406

Abstract: A method for performing trick-mode operations with decreased latency for transcode streaming includes receiving and recording a stream of video data. A single transcoder may transcode the stream of video data and generate output video data in an output buffer following. Segmentation index information may be generated that refers to the output data in the output buffer. Skip-backwards, skip-ahead, and resume requests received from a client device are responded by retrieving transcoded video data from the output buffer or retrieving and transcoding video data from an input storage. A method for performing skip-ahead trick-mode operation with decreased latency may use two transcoders such as two threads of the single transcoder to transcode temporally current content and forward content. The forward content may be associated with a forward time offset with respect to the temporally current content. The transcoded forward content is provided in response to skip-ahead trick mode request.

Abstract translation: 用于以降低的代码转换流程执行特技模式操作的方法包括接收和记录视频数据流。 单个代码转换器可对视频数据流进行代码转换，并在输出缓冲器之后生成输出视频数据。 可以生成指向输出缓冲器中的输出数据的分段索引信息。 通过从输出缓冲器检索经转码的视频数据或从输入存储器检索和代码转换视频数据来响应从客户端设备接收到的向后，向前，跳过和恢复请求。 用于以降低的延迟执行跳过特技模式操作的方法可以使用诸如单个代码转换器的两个线程的两个代码转码器对时间上当前的内容进行转码并转发内容。 前向内容可以与相对于时间上的当前内容的前向时间偏移相关联。 响应于跳过提示特技模式请求提供经转码的前向内容。

公开(公告)号：US09635334B2

公开(公告)日：2017-04-25

申请号：US14041024

申请日：2013-09-30

Applicant: Broadcom Corporation

Inventor： Alexander Garland MacInnis ,  Hongtao Zhu ,  Jason William Herrick ,  Brian Francis Schoner ,  Junlin Li

IPC: H04N5/932 ,  H04N9/80 ,  H04N19/436 ,  H04N19/40 ,  H04N21/242 ,  H04N5/91 ,  H04N9/79 ,  H04N21/845 ,  H04N21/8547 ,  H04N9/82

CPC classification number: H04N9/80 ,  H04N5/91 ,  H04N9/7921 ,  H04N9/8205 ,  H04N19/40 ,  H04N19/436 ,  H04N21/242 ,  H04N21/8456 ,  H04N21/8547

Abstract: Disclosed are various embodiments directed to transcoding a bit stream comprising audio and video frames that contains discontinuities. The video and/or audio portion of the bit stream may be divided into segments, where some of the segments are transcoded in parallel using a plurality of transcoder devices. In some embodiments, a discontinuity is detected in the bit stream before encoding, where the discontinuity is associated with a shift in a set of time stamps associated with the bit stream. A magnitude of the discontinuity is determined. The transcoding system aligns at least a portion of the audio frames to the series of video frames according to at least the discontinuity and the magnitude of the discontinuity. In other embodiments, the discontinuity is detected after encoding by analyzing time stamps that have been established during the transcoding process.

公开(公告)号：US08928804B2

公开(公告)日：2015-01-06

申请号：US13840026

申请日：2013-03-15

Applicant: Broadcom Corporation

Inventor： Alexander Garland MacInnis ,  Hongtao Zhu ,  Jason William Herrick ,  Brian Francis Schoner ,  Junlin Li

IPC: H04N7/01 ,  H04N7/26 ,  H04N19/40 ,  H04N19/124 ,  H04N19/146 ,  H04N19/436

CPC classification number: H04N19/40 ,  H04N19/124 ,  H04N19/146 ,  H04N19/154 ,  H04N19/174 ,  H04N19/436

Abstract: Disclosed are various embodiments directed to transcoding a bit stream in parallel. A bit stream may be divided into a plurality of segments, where a plurality of transcoders encode at least a portion of the segments in parallel. If encoding is performed using variable bit rate (BR) encoding, each encoder may encode a segment and vary a BR for the segment. A measured average BR is compared with a target average BR to determine whether to adjust a video quality level (VQL) or any other encoder parameter. A relatively constant subjective quality may be maintained using variable BR encoding while achieving a target average BR. When using constant BR encoding, a VQL or other encoder parameter is used by encoders to achieve relatively constant subjective quality. For example, a relatively continuous quantization parameter between adjacent encoded segments may be achieved.

Abstract translation: 公开了针对并行地对码流进行代码转换的各种实施例。 比特流可以被划分成多个段，其中多个代码转换器并行地对段的至少一部分进行编码。 如果使用可变比特率（BR）编码来执行编码，则每个编码器可以对段进行编码并改变段的BR。 将测量的平均BR与目标平均BR进行比较，以确定是否调整视频质量水平（VQL）或任何其他编码器参数。 可以使用可变BR编码来维持相对恒定的主观质量，同时实现目标平均BR。 当使用常数BR编码时，编码器使用VQL或其他编码器参数来实现相对恒定的主观质量。 例如，可以实现相邻编码段之间相对连续的量化参数。

公开(公告)号：US20140119457A1

公开(公告)日：2014-05-01

申请号：US13663651

申请日：2012-10-30

Applicant: BROADCOM CORPORATION

Inventor： Alexander MacInnis ,  Hongtao Zhu ,  Jason Herrick ,  Brian Schoner ,  Junlin Li

IPC: H04N7/26

CPC classification number: H04N19/40 ,  H04N19/124 ,  H04N19/177 ,  H04N19/179 ,  H04N19/85

Abstract: Disclosed are various embodiments directed to transcoding a media file in parallel. A media file may be accessed, the media file comprising a bit stream expressing a series of pictures. A first random access point in the bit stream and a second random access point in the bit stream are identified. An input segment of the bit stream is generated, the input segment comprising a starting point, the starting point being the first random access point. One of a plurality of transcoders is selected to transcode the input segment for generating a corresponding output segment, each transcoder being configured to operate concurrently in parallel. The output segment is stored in a memory.

Abstract translation: 公开了针对并行地对媒体文件进行代码转换的各种实施例。 可以访问媒体文件，媒体文件包括表示一系列图片的比特流。 识别比特流中的第一随机接入点和比特流中的第二随机接入点。 生成比特流的输入段，输入段包括起点，起始点是第一随机接入点。 选择多个代码转换器之一来对输入段进行代码转换以产生对应的输出段，每个代码转换器被配置为并行地同时运行。 输出段存储在存储器中。