DEVICE AND METHOD FOR SWITCHING FROM A FIRST DATA STREAM TO A SECOND DATA STREAM

摘要

A device receives first and second data streams representing an audio and/or video content. The device is configured beforehand so as to disseminate the content from the first stream. Following a command for switching from the first stream to the second stream, the device determines by correlation a reference point in the first stream and in the second stream, and determines an offset in time from time-stamping information associated with the reference point in each of the first and second streams. Before switching, the device: pauses the second stream until the offset in time is absorbed when the offset in time indicates that the first stream is late; decreases a frame rate of the first stream until the offset in time is absorbed when the offset in time indicates that the first stream is in advance.

主权项

1. A method implemented by a device for disseminating video or audiovisual contents, said device receiving a first data stream representing a video or audiovisual content and a second data stream representing the video or audiovisual content, said device being configured beforehand to disseminate said video or audiovisual content using the first data stream,
the method being such that, before switching from the first data stream to the second data stream, said device performs: pausing the second data stream until the offset in time is absorbed when an offset in time indicates that the first data stream is late with respect to the second data stream; decreasing a frame rate of the first data stream until the offset in time is absorbed when the offset in time indicates that the first data stream is in advance with respect to the second data stream, wherein, following detection of a command for switching dissemination of the video or audiovisual content from the first data stream to the second data stream, said device performs: determining by correlation analysis a reference point in the video or audiovisual content in the first data stream and in the second data stream, the correlation being made on the basis of luminance histograms of images in the first and second data streams; and determining the offset in time between the first data stream and the second data stream using time-stamping information associated with said reference point in each of the first and second data streams.