公开(公告)号：US20180343458A1

公开(公告)日：2018-11-29

申请号：US16054621

申请日：2018-08-03

Applicant: NETFLIX, INC.

Inventor： Ioannis KATSAVOUNIDIS ,  Anne AARON ,  Jan DE COCK

IPC: H04N19/42 ,  H04N19/179 ,  H04N19/142 ,  H04N19/154 ,  H04N19/177

Abstract: In various embodiments, a sequence-based encoding application partitions a set of shot sequences associated with a media title into multiple clusters based on at least one feature that characterizes media content and/or encoded media content associated with the media title. The clusters include at least a first cluster and a second cluster. The sequence-based encoding application encodes a first shot sequence using a first operating point to generate a first encoded shot sequence. The first shot sequence and the first operating point are associated with the first cluster. By contrast, the sequence-based encoding application encodes a second shot sequence using a second operating point to generate a second encoded shot sequence. The second shot sequence and the second operating point are associated with the second cluster. Subsequently, the sequence-based encoding application generates an encoded media sequence based on the first encoded shot sequence and the second encoded shot sequence.

公开(公告)号：US20180167620A1

公开(公告)日：2018-06-14

申请号：US15782590

申请日：2017-10-12

Applicant: NETFLIX, INC.

Inventor： Zhi LI ,  Anne AARON ,  Anush MOORTHY ,  Christos BAMPIS

IPC: H04N19/154 ,  H04N19/146 ,  H04N21/647 ,  H04N19/59

Abstract: In various embodiments, a perceptual quality application determines an absolute quality score for encoded video content viewed on a target viewing device. In operation, the perceptual quality application determines a baseline absolute quality score for the encoded video content viewed on a baseline viewing device. Subsequently, the perceptual quality application determines that a target value for a type of the target viewing device does not match a base value for the type of the baseline viewing device. The perceptual quality application computes an absolute quality score for the encoded video content viewed on the target viewing device based on the baseline absolute quality score and the target value. Because the absolute quality score is independent of the viewing device, the absolute quality score accurately reflects the perceived quality of a wide range of encoded video content when decoded and viewed on a viewing device.

公开(公告)号：US20180300869A1

公开(公告)日：2018-10-18

申请号：US16017929

申请日：2018-06-25

Applicant: NETFLIX, INC.

Inventor： Anne AARON ,  Dae KIM ,  Yu-Chieh LIN ,  David RONCA ,  Andy SCHULER ,  Kuyen TSAO ,  Chi-Hao WU

IPC: G06T7/00 ,  H04N19/154 ,  H04N21/466 ,  G06T9/00 ,  G06T7/20

Abstract: In one embodiment of the present invention, a quality trainer and quality calculator collaborate to establish a consistent perceptual quality metric via machine learning. In a training phase, the quality trainer leverages machine intelligence techniques to create a perceptual quality model that combines objective metrics to optimally track a subjective metric assigned during viewings of training videos. Subsequently, the quality calculator applies the perceptual quality model to values for the objective metrics for a target video, thereby generating a perceptual quality score for the target video. In this fashion, the perceptual quality model judiciously fuses the objective metrics for the target video based on the visual feedback processed during the training phase. Since the contribution of each objective metric to the perceptual quality score is determined based on empirical data, the perceptual quality score is a more accurate assessment of observed video quality than conventional objective metrics.

公开(公告)号：US20160241878A1

公开(公告)日：2016-08-18

申请号：US14622771

申请日：2015-02-13

Applicant: NETFLIX, Inc

Inventor： Anne AARON ,  Zhonghua MA

IPC: H04N19/65 ,  H04N19/176

Abstract: In one embodiment of the present invention, an encode validator identifies and classifies errors introduced during the parallel chunk-based translation of a source to a corresponding aggregate encode. In operation, upon receiving a source for encoding, a frame difference generator creates a frame difference file for the source. A parallel encoder then distributes per-chunk encoding operations across machines and creates an aggregate encode. The encode validator decodes the aggregate encode and creates a corresponding frame difference file. Subsequently, the encode validator performs phase correlation operations between the two frame difference files to detect errors generated by encoding process faults (i.e., dropping a frame, etc.) while suppressing discrepancies inherent in encoding, such as those attributable to low bit-rate encoding. Advantageously, since the encode validator leverages frame difference files, this indirect verification technique enables efficient debugging of parallel encoding processes in which the complete source is unavailable for post-encode analysis.

Abstract translation: 在本发明的一个实施例中，编码验证器识别并分类在源的基于并行块的转换期间引入的错误到对应的聚合编码。 在操作中，在接收到编码源时，帧差产生器为源创建帧差文件。 并行编码器然后在机器之间分配每个块编码操作，并创建一个聚合编码。 编码验证器解码聚合编码并创建相应的帧差异文件。 随后，编码验证器在两个帧差分文件之间执行相位相关操作，以检测编码处理故障（即，丢帧等）产生的错误，同时抑制编码固有的差异，例如归因于低比特率编码 。 有利的是，由于编码验证器利用帧差分文件，所以这种间接验证技术能够实现并行编码处理的有效调试，其中完整的源不能用于后编码分析。

公开(公告)号：US20210281894A1

公开(公告)日：2021-09-09

申请号：US17328358

申请日：2021-05-24

Applicant: NETFLIX, INC.

Inventor： Glenn Van WALLENDAEL ,  Anne AARON ,  Kyle SWANSON ,  Jan DE COCK ,  Liwei GUO ,  Sonia BHASKAR

IPC: H04N21/2343 ,  H04L29/06 ,  H04N19/587

Abstract: In various embodiments, an interpolation-based encoding application encodes a first subsequence included in a media title at each encoding point included in a first set of encoding points to generate encoded subsequences. Subsequently, the interpolation-based encoding application performs interpolation operation(s) based on the encoded subsequences to estimate a first media metric value associated with a first encoding point that is not included in the first set of encoding points. The interpolation-based encoding application then generates an encoding recipe based on the encoded subsequences and the first media metric value. The encoding recipe specifies a different encoding point for each subsequence included in the media title. After determining that the encoding recipe specifies the first encoding point for the first subsequence, the interpolation-based encoding application encodes the first subsequence at the first encoding point to generate at least a portion of an encoded version of the media title.

公开(公告)号：US20180167619A1

公开(公告)日：2018-06-14

申请号：US15782586

申请日：2017-10-12

Applicant: NETFLIX, INC.

Inventor： Zhi LI ,  Anne AARON ,  Anush MOORTHY ,  Christos BAMPIS

IPC: H04N19/154 ,  H04N19/59 ,  H04N19/146 ,  H04N19/593

Abstract: In various embodiments, a perceptual quality application computes an absolute quality score for encoded video content. In operation, the perceptual quality application selects a model based on the spatial resolution of the video content from which the encoded video content is derived. The model associates a set of objective values for a set of objective quality metrics with an absolute quality score. The perceptual quality application determines a set of target objective values for the objective quality metrics based on the encoded video content. Subsequently, the perceptual quality application computes the absolute quality score for the encoded video content based on the selected model and the set of target objective values. Because the absolute quality score is independent of the quality of the video content, the absolute quality score accurately reflects the perceived quality of a wide range of encoded video content when decoded and viewed.

公开(公告)号：US20160295216A1

公开(公告)日：2016-10-06

申请号：US14673621

申请日：2015-03-30

Applicant: NETFLIX, Inc

Inventor： Anne AARON ,  David RONCA ,  Ioannis KATSAVOUNIDIS ,  Andy SCHULER

IPC: H04N19/146 ,  H04N19/154 ,  H04N19/124

CPC classification number: H04N19/146 ,  H04N19/124 ,  H04N19/154 ,  H04N21/23418 ,  H04N21/23439

Abstract: In one embodiment of the present invention, an encoding bitrate ladder selector tailors bitrate ladders to the complexity of source data. Upon receiving source data, a complexity analyzer configures an encoder to repeatedly encode the source data-setting a constant quantization parameter to a different value for each encode. The complexity analyzer processes the encoding results to determine an equation that relates a visual quality metric to an encoding bitrate. The bucketing unit solves this equation to estimate a bucketing bitrate at a predetermined value of the visual quality metric. Based on the bucketing bitrate, the bucketing unit assigns the source data to a complexity bucket having an associated, predetermined bitrate ladder. Advantageously, sagaciously selecting the bitrate ladder enables encoding that optimally reflects tradeoffs between quality and resources (e.g., storage and bandwidth) across a variety of source data types instead of a single, “typical” source data type.

Abstract translation: 在本发明的一个实施例中，编码比特率梯形图选择器裁剪比特率降低了源数据的复杂度。 在接收到源数据时，复杂度分析器配置编码器以对源数据重复编码 - 将恒定量化参数设置为每个编码的不同值。 复杂度分析器处理编码结果以确定将视觉质量度量与编码比特率相关联的方程式。 屈服单元解决了该等式以估计在视觉质量度量的预定值处的压缩比特率。 基于衰减比特率，衰减单元将源数据分配给具有相关联的预定比特率梯形图的复杂度桶。 有利的是，通过选择比特率梯形图可以实现最佳地反映各种源数据类型之间的质量和资源（例如，存储和带宽）之间的折衷，而不是单一的“典型”源数据类型的折衷。

公开(公告)号：US20240163465A1

公开(公告)日：2024-05-16

申请号：US18486986

申请日：2023-10-13

Applicant: NETFLIX, INC.

Inventor： Ioannis KATSAVOUNIDIS ,  Anne AARON ,  Jan DE COCK

IPC: H04N19/42 ,  H04N19/103 ,  H04N19/142 ,  H04N19/177 ,  H04N19/179

CPC classification number: H04N19/42 ,  H04N19/103 ,  H04N19/142 ,  H04N19/177 ,  H04N19/179 ,  H04N19/154

Abstract: In various embodiments, a sequence-based encoding application partitions a set of shot sequences associated with a media title into multiple clusters based on at least one feature that characterizes media content and/or encoded media content associated with the media title. The clusters include at least a first cluster and a second cluster. The sequence-based encoding application encodes a first shot sequence using a first operating point to generate a first encoded shot sequence. The first shot sequence and the first operating point are associated with the first cluster. By contrast, the sequence-based encoding application encodes a second shot sequence using a second operating point to generate a second encoded shot sequence. The second shot sequence and the second operating point are associated with the second cluster. Subsequently, the sequence-based encoding application generates an encoded media sequence based on the first encoded shot sequence and the second encoded shot sequence.

公开(公告)号：US20220256168A1

公开(公告)日：2022-08-11

申请号：US17174121

申请日：2021-02-11

Applicant: NETFLIX, INC.

Inventor： Anush MOORTHY ,  Zhi LI ,  Liwei GUO ,  Aditya MAVLANKAR ,  Anne AARON

IPC: H04N19/146 ,  H04N19/154 ,  H04N19/30 ,  H04N19/184

Abstract: In various embodiments, an encoding ladder application generates encoding ladders for encoding media titles. In operation, the encoding ladder application generates a first convex hull representing encoding tradeoffs between quality and bitrate when encoding a media title at a first resolution; The encoding ladder application generates a second convex hull representing encoding tradeoffs between quality and bitrate when encoding the media title at a second resolution. Based on the first convex hull and the second convex hull, the encoding ladder application generates an overall convex hull. Subsequently, the encoding ladder application generates an encoding ladder for the media title based on at least the overall convex hull and a ladder requirement. Advantageously, the tradeoffs between quality and bitrate represented by the encoding ladder are customized for the media title. Consequently, encoding inefficiencies attributable to conventional fixed-bitrate ladders can be reduced.

公开(公告)号：US20220038725A1

公开(公告)日：2022-02-03

申请号：US17504412

申请日：2021-10-18

Applicant: NETFLIX, INC.

Inventor： Ioannis KATSAVOUNIDIS ,  Anne AARON ,  Jan DE COCK

IPC: H04N19/42 ,  H04N19/179 ,  H04N19/177 ,  H04N19/142 ,  H04N19/103

Abstract: In various embodiments, a sequence-based encoding application partitions a set of shot sequences associated with a media title into multiple clusters based on at least one feature that characterizes media content and/or encoded media content associated with the media title. The clusters include at least a first cluster and a second cluster. The sequence-based encoding application encodes a first shot sequence using a first operating point to generate a first encoded shot sequence. The first shot sequence and the first operating point are associated with the first cluster. By contrast, the sequence-based encoding application encodes a second shot sequence using a second operating point to generate a second encoded shot sequence. The second shot sequence and the second operating point are associated with the second cluster. Subsequently, the sequence-based encoding application generates an encoded media sequence based on the first encoded shot sequence and the second encoded shot sequence.