Method and apparatus for adaptive reordering for reference frames

An apparatus for encoding a video bitstream, the apparatus comprising:

• a memory storing instructions;
• and
• a processor in communication with the memory, wherein, when the processor executes the instructions, the processor is configured to cause the apparatus to:
• comparing a first template of a current block and a second template of a reference block for motion information, wherein the motion information comprises a spatial reference motion information or a temporal reference motion information;
• calculating a difference between the first template and the second template;
• determining a value for an associated reference frame based in the calculated difference;
• ranking available reference frames based on the value for each of the reference frames;
• and
• reordering the reference frames based on the ranking,
• wherein when multiple motion vectors are pointing to one of the reference frames, one of the motion vectors with a smallest difference is used for determining the value.

A method of processing video data, the method comprising:

• performing, by a device comprising a memory storing instructions and a processor in communication with the memory, a conversion between video data and a bitstream by:
• comparing a first template of a current block and a second template of a reference block for motion information, wherein the motion information comprises a spatial reference motion information or a temporal reference motion information;
• calculating a difference between the first template and the second template;
• determining a value for an associated reference frame based in the calculated difference;
• ranking available reference frames based on the value for each of the reference frames;
• and
• reordering the reference frames based on the ranking,
• wherein when multiple motion vectors are pointing to one of the reference frames, one of the motion vectors with a smallest difference is used for determining the value.