Methods for performing wrap-around motion compensation

A method for encoding a video, comprising:

• signaling a first wrap-around motion compensation flag associated with one or more pictures indicating whether a horizontal wrap-around is enabled or disabled for the one or more picture, and a second wrap-around motion compensation flag associated with a sequence of pictures indicating whether a horizontal wrap-around is enabled or disabled for the sequence of pictures;
• and
• determining whether the first wrap-around motion compensation flag is equal to a first value or a second value based on the second wrap-around motion compensation flag or a luma coding tree block size, wherein determining whether the first wrap-around motion compensation flag is equal to the first value or the second value based on the second wrap-around motion compensation flag or the luma coding tree block size further comprises:
• when the second wrap-around motion compensation flag is equal to the second value, determining the first wrap-around motion compensation flag equal to the second value, or
• when the luma coding tree block size in unit of minimum coding block plus 1 is greater than a picture width in unit of minimum coding block minus 1, determining the first wrap-around motion compensation flag is equal to the second value;
• wherein the first wrap-around motion compensation flag equal to the first value indicates a horizontal wrap-around motion compensation is enabled and the first wrap-around motion compensation flag equal to the second value indicates the horizontal wrap-around motion compensation is disabled, and
• the second wrap-around motion compensation flag equal to the first value indicates the horizontal wrap-around motion compensation is enabled and the second wrap-around motion compensation flag equal to the second value indicates the horizontal wrap-around motion compensation is disabled.

A non-transitory computer readable storage medium for storing a bitstream generated by an encoder, the encoder configured to perform operations comprising:

• signaling a first wrap-around motion compensation flag associated with one or more pictures indicating whether a horizontal wrap-around is enabled or disabled for the one or more picture, and a second wrap-around motion compensation flag associated with a sequence of pictures indicating whether a horizontal wrap-around is enabled or disabled for the sequence of pictures;
• and
• determining whether the first wrap-around motion compensation flag is equal to a first value or a second value based on the second wrap-around motion compensation flag or a luma coding tree block size, wherein determining whether the first wrap-around motion compensation flag is equal to the first value or the second value based on the second wrap-around motion compensation flag or the luma coding tree block size further comprises:
• when the second wrap-around motion compensation flag is equal to the second value, determining the first wrap-around motion compensation flag is equal to the second value, or
• when the luma coding tree block size in unit of minimum coding block plus 1 is greater than a picture width in unit of minimum coding block minus 1, determining the first wrap-around motion compensation flag is equal to the second value;
• wherein the first wrap-around motion compensation flag equal being to the first value indicates that a horizontal wrap-around motion compensation is enabled and the first wrap-around motion compensation flag being equal to the second value indicates that the horizontal wrap-around motion compensation is disabled, and
• the second wrap-around motion compensation flag being equal to the first value indicates that the horizontal wrap-around motion compensation is enabled and the second wrap-around motion compensation flag being equal to the second value indicates that the horizontal wrap-around motion compensation is disabled.