Methods for temporal motion vector prediction

A method for decoding a bitstream, the method comprising:

• receiving a bitstream;
• and
• decoding the bitstream to generate a video sequence, the decoding comprising:
• determining whether a collocated block in a collocated picture of a current block has a block vector (BV);
• in response to the collocated block having the BV, determining the BV;
• determining a motion vector for Temporal Motion Vector Prediction (TMVP) for the current block based on the BV of the collocated block;
• and
• determining a reference index of the TMVP to be a reference index of the collocated picture.

A method for transmitting a bitstream, the method comprising:

• receiving a video sequence;
• encoding the video sequence by:
• determining whether a collocated block in a collocated picture of a current block has a block vector (BV);
• in response to the collocated block having the BV, determining the BV;
• determining a motion vector for Temporal Motion Vector Prediction (TMVP) for the current block based on the BV of the collocated block;
• and
• determining a reference index of the TMVP to be a reference index of the collocated picture;
• and
• transmitting a bitstream that is generated based on the encoding.