METHOD FOR FAST CHANNEL CHANGE AND CORRESPONDING DEVICE

摘要

In a video delivery environment where a channel change in an audio/video receiver starts with a burst delivery of an audio/video stream to the receiver, characteristics of the audio/video stream are determined such as audio-video drift and burst characteristics in terms of duration of excess data delivery. At least one of these characteristics determines an offset to add to an initialization of a decoder clock, so that moving images are shown as early as possible after receipt of the channel change command, to be joined by lip synchronized audio before burst end.

主权项

1. A method for fast channel change of an audio/video receiver device receiving an audio/video stream over an Internet Protocol network, wherein the method is implemented by said audio/video receiver device, the method comprising:
receiving a channel change command; transmitting a request for burst delivery of said audio/video stream corresponding to a new channel; initializing a decoder clock in said audio/video receiver device with a value of a last Program Clock Reference comprised in said burst delivery before receipt of a video Presentation Time Stamp comprised in said burst delivery plus an offset, wherein said offset is a function of a drift between video frames and corresponding audio frames in said burst and of a duration of excess data delivery of said burst delivery defined as a duration of a part of said burst delivery during which data is received in excess compared to a delivery at playout rate; and receiving said audio/video stream at said playout rate after end of said burst delivery.