公开(公告)号：US20140241415A1

公开(公告)日：2014-08-28

申请号：US14190880

申请日：2014-02-26

Applicant: Apple Inc.

Inventor： Yeping SU ,  Hao PAN ,  James O. NORMILE ,  Hsi-Jung WU

IPC: H04N19/152 ,  H04N19/142

CPC classification number: H04N19/152 ,  H04N19/142 ,  H04N21/23418 ,  H04N21/23424 ,  H04N21/23439 ,  H04N21/2402 ,  H04N21/44004 ,  H04N21/44008 ,  H04N21/8456

Abstract: Systems and methods are presented for minimizing the suddenness and immediacy of changes to the video quality perceived by users due to bandwidth fluctuations and transitions between different bitrate streams. A method may include identifying an upcoming bitrate change in a bitstream and a nearest scene cut boundary from sync frame scene cut tags included in the bitstream. The method may include calculating whether waiting until the identified nearest scene cut boundary before changing the bitrate will cause the buffer to drop below a threshold. When the buffer is calculated to not drop below the threshold, the method may postpone the upcoming bitrate change until the identified nearest scene cut boundary.

Abstract translation: 提出了系统和方法，用于最小化由于带宽波动和不同比特率流之间的转换而使用户感知到的视频质量的突变和即时性。 一种方法可以包括从比特流中包括的同步帧场景切换标签中识别比特流中的即将到来的比特率变化和最近的场景剪切边界。 该方法可以包括计算是否在更改比特率之前等待直到所识别的最近的场景切割边界将导致缓冲器降低到阈值以下。 当缓冲区被计算为不低于阈值时，该方法可以推迟即将到来的比特率改变直到所识别的最近的场景切割边界。