公开(公告)号：US11410700B2

公开(公告)日：2022-08-09

申请号：US17349733

申请日：2021-06-16

申请人： Apple Inc.

发明人： Gurtej Singh G. Chandok ,  Eric L. Chien ,  Christopher M. Garrido ,  Ming Jin ,  Karthick Santhanam ,  Brian T. Toombs ,  Joshua L. Hare ,  David L. Biderman ,  Patrick Miauton ,  Luciano M. Verger

IPC分类号： H04N5/783 ,  G11B27/00

摘要： A video playback buffer adjustment system is disclosed. The video playback buffer has a target size, measured in units of time of content, and includes a compressed frames queue and an uncompressed frames queue. The uncompressed frames queue has a minimum threshold queue size. If the size of the uncompressed frames queue falls below the minimum threshold size, then a next encoded frame in the compressed frames queue is removed from the compressed frames queue, decoded, and enqueued in the uncompressed frames queue. If a current size of the playback queue exceeds the target size plus Δ (a hysteresis value), then a playback frame rate is increased, and a presentation time of one or more frames in the uncompressed frames queue is adjusted according to the increased playback frame rate. If the playback queue size is less than the target size minus Δ, the playback speed can be reduced.

公开(公告)号：US20210400338A1

公开(公告)日：2021-12-23

申请号：US17304273

申请日：2021-06-17

申请人： Apple Inc.

发明人： Luciano M. Verger ,  David L. Biderman ,  Christopher M. Garrido ,  Karthick Santhanam ,  Brian T. Toombs ,  Gurtej Singh G. Chandok ,  Joshua L. Hare ,  Patrick Miauton ,  Ming Jin ,  Bradley F. Patterson

IPC分类号： H04N21/44 ,  H04N21/442 ,  H04N21/458

摘要： A method and apparatus of a device that uses a video jitter buffer to buffer the video frames for a received video stream is described. The device uses the video jitter buffer to estimate the delay variability of the frames and pick a target delay that will help harmonize the playback with minimal loss and delay. This is achieved by estimating the delay spread, which is the result of performing statistical analysis of the measured lags of the video frames received. The video jitter buffer provides target delay recommendation and reference frame information to the video player in order to anchor the playback and schedule the frames presentation time.

公开(公告)号：US20210398563A1

公开(公告)日：2021-12-23

申请号：US17349733

申请日：2021-06-16

申请人： Apple Inc.

发明人： Gurtej Singh G. Chandok ,  Eric L. Chien ,  Christopher M. Garrido ,  Ming Jin ,  Karthick Santhanam ,  Brian T. Toombs ,  Joshua L. Hare ,  David L. Biderman ,  Patrick Miauton ,  Luciano M. Verger

IPC分类号： G11B27/00

摘要： A video playback buffer adjustment system is disclosed. The video playback buffer has a target size, measured in units of time of content, and includes a compressed frames queue and an uncompressed frames queue. The uncompressed frames queue has a minimum threshold queue size. If the size of the uncompressed frames queue falls below the minimum threshold size, then a next encoded frame in the compressed frames queue is removed from the compressed frames queue, decoded, and enqueued in the uncompressed frames queue. If a current size of the playback queue exceeds the target size plus Δ (a hysteresis value), then a playback frame rate is increased, and a presentation time of one or more frames in the uncompressed frames queue is adjusted according to the increased playback frame rate. If the playback queue size is less than the target size minus Δ, the playback speed can be reduced.