Compressed video data stream switching method
AssigneeThomson Licensing
InventorsDominique Thoreau, Yannick Olivier, Franck Hiron, Anita Orhand
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Abstract
According to the method, the second data stream is modified prior to transmission, by a replacement of the bidirectional pictures with bidirectional commutation pictures of which the pictures blocks have a null residue and a null motion vector which is either forward or backward, according to the position of the blocks in the picture. The applications relate to the transmissions and the storage of programmes, the editing.
Claims10
Compressed video data stream switching method for the transmission of a first data stream corresponding to a first video sequence, followed by, in a given switching point of this first stream, a second data stream corresponding to a second video sequence—each sequence being coded according to a GOP (Group of Pictures) structure—each GOP comprising intra type pictures coded in intra, predictive type pictures coded in inter and bidirectional type pictures coded in inter, wherein the second data stream is modified prior to its transmission, by replacing bidirectional type pictures, pictures following the intra picture of the first GOP of the second sequence following the switching point, when one considers the coding order of the pictures, by bidirectional pictures, called commutation pictures, in which pictures blocks have a null residue and a null motion vector that is either forward or backward according to the position of the blocks in the picture.
Dependencies are inferred from the claim text.