| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the bandwidth required to transmit a video program stream used in addition to a main video program stream in order to reduce the channel change time. <P>SOLUTION: A service is encoded and streamed in its original format, plus encoded and streamed in a low resolution format. The method comprises selecting GOPs transmitted in a companion service that have a presentation time of an I picture close to the presentation time of an I picture of the original service. These selected GOPs of the companion stream will not be used and do not need to be transmitted. After a channel change action, a receiver waits for a first compressed I picture to be decoded in both streams. As soon as two encoded I pictures are available to be decoded at the same time, the receiver systematically chooses the main stream but not the companion stream. <P>COPYRIGHT: (C)2012,JPO&INPIT |
