公开(公告)号：US11153585B2

公开(公告)日：2021-10-19

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 ,  H04N19/177 ,  H04N19/142 ,  H04N19/103 ,  H04N19/154 ,  H04N19/146 ,  H04N19/147

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：US10798387B2

公开(公告)日：2020-10-06

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 ,  H04N21/647 ,  H04N19/146 ,  H04N21/234 ,  H04N21/2343 ,  H04N17/00 ,  H04N19/00 ,  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：US11758148B2

公开(公告)日：2023-09-12

申请号：US17093449

申请日：2020-11-09

Applicant: NETFLIX, INC.

Inventor： Zhi Li ,  Anne Aaron ,  Anush Moorthy ,  Christos Bampis

IPC: H04N19/154 ,  H04N19/59 ,  H04N21/647 ,  H04N19/146 ,  H04N21/234 ,  H04N21/2343 ,  H04N17/00 ,  H04N19/00 ,  H04N19/593

CPC classification number: H04N19/154 ,  H04N17/004 ,  H04N19/00 ,  H04N19/146 ,  H04N19/59 ,  H04N19/593 ,  H04N21/23418 ,  H04N21/23439 ,  H04N21/647

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：US11019374B2

公开(公告)日：2021-05-25

申请号：US16780752

申请日：2020-02-03

Applicant: NETFLIX, INC.

Inventor： Glenn Van Wallendael ,  Anne Aaron ,  Kyle Swanson ,  Jan De Cock ,  Liwei Guo ,  Sonia Bhaskar

IPC: G06F15/16 ,  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：US10674180B2

公开(公告)日：2020-06-02

申请号：US14622771

申请日：2015-02-13

Applicant: NETFLIX, Inc

Inventor： Anne Aaron ,  Zhonghua Ma

IPC: H04N19/65 ,  H04N19/176 ,  H04N17/00

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.

公开(公告)号：US11503304B2

公开(公告)日：2022-11-15

申请号：US17093456

申请日：2020-11-09

Applicant: NETFLIX, INC.

Inventor： Zhi Li ,  Anne Aaron ,  Anush Moorthy ,  Christos Bampis

IPC: H04N19/154 ,  H04N19/59 ,  H04N21/647 ,  H04N19/146 ,  H04N21/234 ,  H04N21/2343 ,  H04N17/00 ,  H04N19/00 ,  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：US11425432B2

公开(公告)日：2022-08-23

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: G06F15/16 ,  H04N21/2343 ,  H04L65/80 ,  H04N19/587 ,  H04L65/70 ,  H04L65/75

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：US10827185B2

公开(公告)日：2020-11-03

申请号：US15207468

申请日：2016-07-11

Applicant: NETFLIX, Inc.

Inventor： Anne Aaron ,  Zhi Li ,  Todd Goodall

IPC: H04N19/156 ,  H04N19/86 ,  H04N19/149 ,  H04N19/154 ,  H04N19/00 ,  G06K9/00 ,  H04N17/00

Abstract: In various embodiments, a quality trainer trains a model that computes a value for a perceptual video quality metric for encoded video content. During a pre-training phase, the quality trainer partitions baseline values for metrics that describe baseline encoded video content into partitions based on genre. The quality trainer then performs cross-validation operations on the partitions to optimize hyperparameters associated with the model. Subsequently, during a training phase, the quality trainer performs training operations on the model that includes the optimized hyperparameters based on the baseline values for the metrics to generate a trained model. The trained model accurately tracks the video quality for the baseline encoded video content. Further, because the cross-validation operations minimize any potential overfitting, the trained model accurately and consistently predicts perceived video quality for non-baseline encoded video content across a wide range of genres.

公开(公告)号：US10547856B2

公开(公告)日：2020-01-28

申请号：US15296580

申请日：2016-10-18

Applicant: NETFLIX, INC.

Inventor： Jan De Cock ,  Anne Aaron

IPC: H04N7/12 ,  H04N19/21 ,  H04N19/184 ,  H04N21/2343 ,  H04N21/845

Abstract: A bitrate allocation engine allocates bitrates for distributed encoding of source data. Upon receiving a chunk of source data, the bitrate allocation engine generates a curve based on multiple points that each specify a different visual quality level and corresponding encoding bitrate for encoding the chunk. Subsequently, the bitrate allocation engine computes an optimized encoding bitrate based on the generated curve and an optimization factor that is associated with different visual quality levels and corresponding encoding bitrates for multiple chunks of the source data. The bitrate allocation engine then causes the chunk to be encoded at the optimized encoding bitrate. Advantageously, the resulting encoded chunk is optimized with respect to the optimization factor for multiple chunks of the source data.

公开(公告)号：US11750821B2

公开(公告)日：2023-09-05

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 ,  H04N19/184 ,  H04N19/30

CPC classification number: H04N19/146 ,  H04N19/154 ,  H04N19/184 ,  H04N19/30

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.