Proposals for improving data sharing in the svc(scalable video coding) file format

A method for improving data sharing in an SVC(Scalable Video Coding) file format is provided to avoid the repetition of data with respect to a common part of meta data according to tracks to obtain the reduction effect of storing capacity. An ID designating a track and an ID designating a layer are formed in meta data. All the metal data designating the same layer refers to original meta data to prevent the same presentation of the original meta data from being repeatedly copied. When tracks having the same presentation are formed as one scalable base track and several sub-tracks, references capable of searching the scalable base track is formed in the respective sub-tracks to search all the tracks having the same presentation.