Limited memory access window for motion vector refinement

A method for transmitting a bitstream of video data, the method comprising:

• storing the bitstream of video data, wherein the bitstream of video data is generated by:
• splitting a video image to obtain a block;
• obtaining an initial motion vector;
• determining a refinement of the initial motion vector by bilateral matching in a search space, wherein the search space is located on a position given by the initial motion vector and includes one or more fractional sample positions, and wherein each of the one or more fractional sample positions belonging to the search space is obtained by interpolation filtering with an interpolation filter of a predefined tap-size assessing integer samples only within a window, the window being formed by integer samples accessible for the bilateral matching in the search space;
• and
• generating the bitstream of video data comprising the block encoded based on the refinement, wherein the window is defined around a position pointed by the initial motion vector, wherein the window is larger than the block, and wherein the search space is a rectangular sub-window of the window;
• and
• transmitting the bitstream of video data.