Patent ID: 8677442
Filing Date: 2014-03-18
Classification: H04N

Abstract:
1. Method of local calculation in a receiver of a current relative temporal position of recovery within an audio/video program received by said receiver, wherein said method comprises at least the following steps: initializing a stored current relative temporal position of recovery to zero; reception of a digital audio/video data stream belonging to said audio/video program and comprising presentation time stamps; upon reception of a new presentation time stamp in said digital audio/video data stream, calculating a difference, delta, between said new presentation time stamp in said digital audio/video data stream and a stored previously received presentation time stamp, and adding said delta to said stored current relative temporal position if said delta is not greater than a determined threshold value, said threshold value being dependent on a stream recovery speed, if said delta is greater than said determined threshold value, not performing said addition, being in the presence of a sequence discontinuity caused by time reference system changes in said digital audio/video data stream, and copying of said new presentation time stamp to storage used for storing said previously received presentation time stamp; sending of an audio/video program broadcast control command from said receiver to a digital audio/video data stream server, said audio/video program broadcast control command containing a current relative temporal position of recovery of the audio/video program received by said receiver that is based on said stored current relative temporal position of recovery; comparing, during a recovery by said receiver of said audio/video program at modified speed, said presentation time stamps in said digital audio/video data stream having been calculated for a recovery at normal speed, a difference between two presentation time stamps with a picture frequency of pictures in said digital data stream; and if said difference is close to said picture frequency instead of being a product of the recovery speed, multiplying said delta by said modified speed before said adding step.