Apple Inc.

Other

Francesco Iacopino

Xiaohua Yang

Linfeng Guo

Athanasios Leontaris

Yaxiong Zhou

Xiang Fu

Felix Chou

Jim Chen Chou

Hao Pan

Haitao Guo

Ke Chen

Krishnakanth Rapaka

Ying Jian He

Munehiro Nakazato

Ye Cong

Krishna Rapaka

Mukta Gore

In one implementation, a method of generating a bit stream encoding a video stream is performed by a device including one or more processors and non-transitory memory. The method includes decomposing a video stream into a plurality of frequency band video streams. The method includes determining a target bitrate and determining, for each frequency band video stream, a respective frequency band bit rate based on the target bit rate. The method includes encoding each of the plurality of frequency band video streams at its respective frequency band bit rate and transmitting, over a channel, each encoded frequency band video stream.

Multi-band rate control

An electronic device includes a video encoding pipeline configured to encode source image data. The video encoding pipeline includes a first transcode engine and a second transcode engine. The electronic device also includes processing circuitry configured to determine a target throughput for a bin stream and determine whether to encode the bin stream using only the first transcode engine or both the first and second transcode engines based on the target throughput. The processing circuitry is also configured to cause only the first transcode engine to encode the bin stream or both the first and second transcode engines to encode the bin stream based on determining whether to encode the bin stream using only the first transcode engine or both the first and second transcode engines.

Selectable transcode engine systems and methods

Techniques for encoding video with reduced frame-boundary artifacts are presented. The techniques include a video encoding method, where, when skip mode is selected as a motion prediction coding mode for a pixel block predicted from a reference block of a reference frame, estimating an amount of the reference block that extends beyond the edge of the reference frame. If the amount beyond the edge does not exceed a threshold, the prediction may be coded with skip mode. If the amount beyond the edge exceeds a threshold, the pixel block may be partitioned, and the partitioned blocks may be coded with motion prediction.

Frame boundary artifacts removal

Techniques are disclosed for developing quantization matrices for use in video coding. According to these techniques a first quantization matrix may be derived from a second quantization matrix by scaling quantization values of the second quantization matrix by scaling parameters. The scaling parameters may increase according to distance between each matrix position and a matrix origin, they may be derived from characteristics of a video sequence to be coded, or both. The first quantization matrix may be communicated to a decoder. Thereafter, a video sequence may be coded predictively. As part of the coding, pixel data of the video sequence may be transformed to a plurality of frequency domain coefficients, and the frequency domain coefficients may be quantized according to the first quantization matrix.

Techniques for calculation of quantization matrices in video coding

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San Jose, CA, United States of America

Francesco Iacopino