A method for video coding is provided. The method may include: arranging video data in a plurality of luma subblocks and a plurality of chroma subblocks, where each chroma subblock corresponds to one or more luma subblocks; and deriving an affine motion vector for a chroma subblock out of the chroma subblocks using motion vectors of the corresponding luma subblocks. The video data has a color sub-sampling format, and the corresponding luma subblocks are derived according to the color sub-sampling format.
展开▼
