Abstract: A video decoding method according to an embodiment of the present disclosure includes: obtaining a width of a picture based on information about the width of the picture that is obtained from a bitstream and obtaining a height of the picture based on information about the height of the picture that is obtained from the bitstream; when an x coordinate according to a luma width of a current block generated from the picture is not greater than the width of the picture, a y coordinate according to a luma height of the current block is not greater than the height of the picture, and a split mode of a luma block of the current block is a non-split mode, decoding the luma block; and determining a chroma block corresponding to the luma block and decoding the chroma block, wherein the information about the width of the picture indicates a number of luma samples arranged in a width direction of the picture, the number of luma samples arranged in the width direction is an integer multiple of 8, the information about the