公开(公告)号：US11968383B2

公开(公告)日：2024-04-23

申请号：US17491944

申请日：2021-10-01

Applicant: Apple Inc.

Inventor： Zeina Sinno ,  Steven E. Saunders

IPC: H04N19/46 ,  H04N17/00 ,  H04N19/154 ,  H04N19/176

CPC classification number: H04N19/46 ,  H04N17/00 ,  H04N19/154 ,  H04N19/176

Abstract: Techniques are presented for inserting markers into a video stream. For each frame of an encoded video stream, disclosed techniques may determine a structure of macroblocks from a code of the frame, and then, select macroblocks to be replaced from the determined structure of macroblocks. Inserting a marker into a frame may be carried out by replacing codes of the selected macro blocks with a code of a marker that identifies the frame. Marking frames of the video stream may facilitate finding correspondence between frames from the video stream before transmission over a channel and the video stream received from the channel, based on the inserted markers. Knowledge of frame correspondence may enable a video quality metric estimation based on a comparison between the found corresponding frames.