公开(公告)号：US10999578B2

公开(公告)日：2021-05-04

申请号：US16612889

申请日：2017-12-12

Applicant: Google LLC

Inventor： Chao Chen ,  Balineedu Adsumilli ,  Shawn Singh ,  Yilin Wang

IPC: H04N19/124 ,  H04N19/103 ,  H04N19/154 ,  H04N19/172 ,  H04N19/176 ,  H04N19/61

Abstract: Systems and methods for transcoding media content are disclosed. In some embodiments, the method includes obtaining a transcoded media content that is transcoded from an uploaded media content. The method includes determining a plurality of degradation metric values corresponding to the transcoded media content based on the uploaded media content and the transcoded media content, each degradation metric value corresponding to a different degradation metric type. The method includes mapping each degradation metric value to a respective calibrated score to obtain a plurality of calibrated scores. The method includes determining an aggregated quality score of the transcoded media content based on the plurality of calibrated scores and an exponential weighting function. The exponential weighting function exponentiates each of the calibrated scores by a respective weighting exponent and aggregates the exponentiated calibrated scores. The method includes selectively reencoding the transcoded media content based on the aggregated quality score.

公开(公告)号：US20210112295A1

公开(公告)日：2021-04-15

申请号：US16613961

申请日：2017-12-12

Applicant: Google LLC

Inventor： Neil Birkbeck ,  Balineedu Adsumilli ,  Damien Kelly

IPC: H04N21/2662 ,  H04N21/81 ,  H04N21/233 ,  H04N21/234 ,  H04N21/4728

Abstract: Signals of an immersive multimedia item are jointly considered for optimizing the quality of experience for the immersive multimedia item. During encoding, portions of available bitrate are allocated to the signals (e.g., a video signal and an audio signal) according to the overall contribution of those signals to the immersive experience for the immersive multimedia item. For example, in the spatial dimension, multimedia signals are processed to determine spatial regions of the immersive multimedia item to render using greater bitrate allocations, such as based on locations of audio content of interest, video content of interest, or both. In another example, in the temporal dimension, multimedia signals are processed in time intervals to adjust allocations of bitrate between the signals based on the relative importance of such signals during those time intervals. Other techniques for bitrate optimizations for immersive multimedia streaming are also described herein.