Merge candidate reorder based on global motion vector

A method comprising:

• receiving, by a decoder comprising circuitry, a bitstream including a coded picture, the coded picture including a first region having a first plurality of coding units and a second region having a second plurality of coding units;
• constructing, by the decoder, for each coding unit in the first region a motion vector candidate list, each motion vector candidate list having a common motion vector, wherein the order of the motion vector candidates in each motion vector candidate list is determined without regard to frequency of use and the motion vector candidate lists are ordered such that the common motion vector is first;
• decoding, by the decoder, the first plurality of coding units using the common motion vector from the motion vector candidate lists, whereby a picture region with common motion is reconstructed in the first region;
• ascertaining, by the decoder, from the bitstream individually determined motion vectors for each coding unit of the second region, wherein adjacent coding units in the second region have different individually determined motion vectors, each individually determined motion vector being one of a translational motion vector or a control point motion vector for four parameter or six parameter affine motion;
• and
• decoding, by the decoder, the second plurality of coding units using the individually determined motion vectors, whereby local motion in the second region is reconstructed.