Method and apparatus for storing or transmitting coding parameters separately from coded audio-visual data
View Patent ↗Compression parameter sets are stored in files separate from the main AV or transmitted separately and prior to any subsequent transmission of AV data. The scope of parameter set identifiers is limited to not more than a Program Chain. Either existing files are extended by including the compression parameter sets directly, or separate files containing the compression parameter sets are created. In order to support easy authoring of compound content, it is proposed to amend each compression parameter set or groups of such parameter sets with scope period information, which can be based on time stamps, on file names, or on sector numbers on the disc. It is additionally proposed to employ an indirect referencing mechanism, where parameter set identifiers are referring to secondary tables, and where the entries of secondary tables are defined to be themselves identifiers referring in turn to entries of a common parameter set table provided once.
1. Video coding method practiced by a video encoder and using a number of compression parameter sets being referenced from within coded data, wherein said compression parameter sets are stored in auxiliary data files that are uniquely associated to a file or stream containing a main Audio Visual (AV) bit stream, and wherein identifiers of said compression parameter sets and the corresponding references to these identifiers in the main AV bit stream are unique within said auxiliary data files and associated file or stream containing the main AV bit stream
indirectly referencing said compression parameter sets by said video encoder,
defining the parameter set identifiers in the AV bit stream of each of a set of parts of AV material being to refer to entries of a secondary table by the video encoder;
storing said secondary table in auxiliary files in a data structure which is repeated per each said part so said secondary table is individually available per each said part by the video encoder;
defining entries of all said secondary tables of said AV material to be themselves to refer in turn to entries of a common parameter set table provided once per said AV material by the video encoder.
2. Video coding method according to claim 1 , wherein the validity period of said compression parameter set identifiers is explicitly signaled.
3. Video coding method according to claim 2 , wherein the signaling of the validity period of the compression parameter set identifiers is based on the presentation or decoding time information associated to portions of the main AV bit stream.
4. Video coding method according to claim 2 , wherein the signaling of the validity period of the compression parameter set identifiers is based on the file names associated to portions of the main AV bit stream.
5. Video coding method according to claim 2 , wherein the signaling of the validity period of the compression parameter set identifiers is based on an existing identification of the underlying transport or storage entities, such as packets or sectors, associated to portions of the main AV bit stream carried therein.
6. Video coding apparatus using a method according to claim 1 .
7. Video decoding method for decoding a video signal coded according to claim 1 .
8. Video decoding apparatus using a method according to claim 7 .
9. Video coding method according to claim 1 , wherein existing auxiliary data files related to said file or stream containing the main AV bit stream are extended to carry said compression parameter sets.