Patent ID: 6243495
Filing Date: 2001-06-05
Classification: H04N

Abstract:
A method of modifying a group of picture structure from a low-delay mode bitstream to a non-low-delay mode bitstream comprising:converting motion vectors for pictures in the low-delay mode bitstream corresponding to anchor frames in the non-low-delay mode bitstream to motion vectors for anchor frames in the non-low-delay mode bitstream;converting motion vectors for pictures in the low-delay mode bitstream corresponding to bidirectionally predicted pictures in the non-low-delay mode bitstream to motion vectors for bidirectionally predicted pictures in the non-low-delay mode bitstream; andrecoding an uncompressed video derived from the low-delay mode bitstream into the non-low-delay mode bitstream using the motion vectors for anchor frames in the non-low-delay mode bitstream and motion vectors for bidirectionally predited pictures in the non-low-delay mode bitstream.