Method of switching between video sequences and corresponding device

Abstract

The invention relates, in encoding/decoding systems, to an improved method of switching from a first coded video sequence to a second one. In order to avoid underflow or overflow of the decoder buffer, a transcoding of the input streams IS1 and IS2 is used to shift the temporal position of the switching point and to obtain at the output of the provided transcoders ( 11, 12 ) streams TS1 and TS2 containing an identical entry point and the same decoder buffer characteristics.

1 . A method of switching from a first coded video sequence to a second one, said video sequences having been encoded by different video encoders using regulation buffers, wherein the switching step is preceded by a transcoding step of each of said coded sequences, provided for shifting the temporal position of the switching point.  
     
     
         2 . A device for switching from a first coded video sequence to a second one, said video sequences having been encoded by different video encoders using regulation buffers and said device comprising a switching circuit that receives on two inputs coded input bistreams corresponding to said first and second video sequences and yields an output stream corresponding to only one of said coded input bitstreams, wherein each input of the switching circuit is preceded by a transcoding circuit.