Video encoding and decoding method based on entry point information in a slice header, and apparatus using same

A video decoding method, performed by a decoding apparatus, comprising:

• obtaining entry point information specifying an entry point of a substream for a picture from a bitstream;
• reconstructing the picture based on the entry point information;
• and
• deblocking filtering on the picture,
• wherein the entry point information include a number syntax element representing a number of offset syntax elements in a slice header,
• wherein the entry point information includes an offset syntax element representing an entry point offset between in bytes two entry points,
• wherein the entry point information includes a length syntax element representing a bits length of the offset syntax element,
• wherein a value of the length syntax element plus one corresponds to the bits length of the offset syntax element and the length syntax element is signaled when the number of the offset syntax elements is larger than 0,
• wherein a value of the number syntax element corresponds to the number of offset syntax elements in the slice header, and
• wherein the offset syntax element is signaled when the number of the offset syntax elements is larger than 0.

A non-transitory computer readable storage medium storing a bitstream generated by a method, the method comprising:

• reconstructing a picture;
• deblocking filtering on the picture;
• deriving entry point information specifying an entry point of a substream for the picture;
• and encoding the entry point information to generate the bitstream, wherein the entry point information include a number syntax element representing a number of offset syntax elements in a slice header, wherein the entry point information includes an offset syntax element representing an entry point offset between in bytes two entry points, wherein the entry point information includes a length syntax element representing a bits length of the offset syntax element, wherein a value of the length syntax element plus one corresponds to the bits length of the offset syntax element and the length syntax element is signaled when the number of the offset syntax elements is larger than 0, wherein a value of the number syntax element corresponds to the number of offset syntax elements in the slice header, and wherein the offset syntax element is signaled when the number of the offset syntax elements is larger than 0.