Arris Enterprises LLC

Google Inc.

Arris Technology, Inc.

Brenda Van Veldhuisen

Robert S Nemiroff

Mayer D Schwartz

Peter A Borgwardt

Shiv Saxena

Jing Yang Chen

A method for transcoding a digital video stream that includes transcoding using a transcoder a video stream that includes presentation time stamps for the video stream together with an audio stream that includes presentation time stamps for the audio stream in a manner that modifies the presentation time stamps for the video stream in a manner such that a plurality of first values for presentation time stamps for a first set of video frames of the video stream are modified to a plurality of second values for presentation time stamps for the second set of video frames. The audio stream includes embedded first values for presentation time stamps in a first location. The method includes determining an offset of the second values of the second set of presentation time stamps of the transcoded video stream based upon the first values of the set of presentation time stamps embedded in the audio stream from the transcoder. The method includes combining the transcoded video stream and an associated audio stream based upon the offset. Preferably, the transcoder also modifies the audio time stamps. Preferably, the audio stream includes the embedded first values. Preferably, the offset is determined by taking the diff between the audio PTS in the PES and the embedded PTS in the audio packet (private data or embedded in the audio frame).

System for presentation time stamp recovery from a transcoder

Restructuring technique for video frames

A statistical multiplexer (statmux) system for encoding multiple channels of digital television data is provided with improved algorithms for determining bitrate for encoding and decoding to account for signal complexity. The variable bit rate (VBR) encoders and encoding are provided in a statmux system by employing a CBR (constant bit rate) adapter. A CBR adapter can provide correcting state updates on a per-frame basis to a CBR encoder element, thereby enabling VBR capability.

Statistical multiplexing system for variable bit rate encoding with constant bit rate encoder

A system for transcoding a digital video stream using a transcoder includes receiving a digital video stream that includes an input video stream and extracting a first set of presentation time stamps from the input video stream which are stored in a table. The system transcodes the input video stream including the first set of presentation time stamps from an initial set of characteristics to a modified set of characteristics including a second set of presentation time stamps that are different from the first set of presentation time stamps. The system processes the second set of presentation time stamps of the transcoded video stream to determine if the second presentation time stamps include jitter, and based upon determining the second set of presentation time stamps include jitter modifying the second set of presentation time stamps based upon the first set of presentation time stamps in the table.

System for jitter recovery from a transcoder

A dual-pass rate control video encoder including a first pass encoder module configured to receive uncompressed input video including a sequence of pictures, the input video including a plurality of contiguous sequences of pictures each referred to as a Group of Pictures (GOP) that, when coded, begin with an I-picture in display order and end with a last picture before a next I-picture, detect scene changes within the input video. The dual-pass rate control video encoder including a second pass encoder module configured to receive the uncompressed input video via a delay unit.

Apparatus for dual pass rate control video encoding

Techniques for synchronizing streams in an adaptive streaming environment include cross-chassis and intra-chassis synchronization of video and/or audio. In an adaptive streaming system that streams content in segments or chunks at varying levels of quality corresponding to different coding rates, implementations enable seamless switching between output streams. For example, synchronizing multiple output streams for switching between coded adaptive bit rate streams across multiple chassis involve enforcing decisions of a master encoder for inverse telecine, frame rate conversion, and segment boundary to slave encoders associated with the same group of output stream representations.

Adaptive streaming transcoder synchronization

A method of dual-pass rate control video encoding and an encoder are disclosed. Uncompressed input video is received with a video encoder. First pass encoding is performed, and a second pass encoding is performed with the video encoder at a delay relative to the first pass. The first pass encoding detects scene changes within the input video, assigns macroblocks to a pre-determined number of activity classes, and determines a complexity of each picture within the sequence of pictures. Information from the first pass encoding concerning the scene changes, the activity classes, and the complexity are used for rate control determined in second pass encoding for producing and outputting a bit stream of compressed video. During at least one of the first pass and second pass encoding, boundaries of at least some of the GOPs are adjusted to be aligned with the scene changes.

Method for dual pass rate control video encoding

A statistical multiplexer (statmux) system for encoding and multiplexing multiple channels of digital television data is provided that limits dropped bits due to misalignment of bit rate allocations to the encoders. Without such a system, if for example an encoder is allotted 0 bits during a first time period and 20 kilobits during a second time period, if the encoder jumps ahead from the first period to the second time period allocation, the 20 kilobits could be output during the 0 bit output allocation time period. This can cause buffer overflow downstream if other encoders are outputting at their maximum rate. To limit such misalignment, a maximum percentage increase of an encoder's bitrate allocation is set from time period to time period based on a formula to prevent bits from being dropped when misalignment occurs.

Growing community of inventors

Portland, OR, United States of America

Brenda Van Veldhuisen