e" This process is invoked when memory_management_control_operation is equal to 2. Depending on field_pic_flag the value of LongTermPicNum is used to mark a long-term reference picture as "unused for reference" as follows: If field_pic_flag is equal to 0, the long-term reference frame or long-term complementary reference field pair having LongTermPicNum equal to long_term_pic_num and both of its fields are marked as "unused for reference". Otherwise (field_pic_flag is equal to 1), the long-term reference field specified by LongTermPicNum equal to long_term_pic_num is marked as "unused for reference". When that reference field is part of a reference frame or a complementary reference field pair, the frame or complementary field pair is also marked as "unused for reference", but the marking of the other field in the same reference frame or complementary reference field pair is not changed. 8.2.5.4.3 Assignment process of a LongTermFrameldx to a short-term reference picture This process is invoked when memory_management_control_operation is equal to 3. Given the syntax element difference_of_pic_nums_minus1, the variable picNumX is obtained as specified in clause 8.2.5.4.1. picNumX shall refer to a frame or complementary reference field pair or non-paired reference field marked as "used for short-term reference" and not marked as "non-existing". When LongTermFrameIdx equal to long_term_frame_idx is already assigned to a long-term reference frame or a long-term complementary reference field pair, that frame or complementary field pair and both of its fields are marked as "unused for reference". When LongTermFrameIdx is already assigned to a reference field, and that reference field is not part of a complementary field pair that includes the picture specified by picNumX, that field is marked as "unused for reference". Depending on field_pic_flag the value of LongTermFrameldx is used to mark a picture from "used for short-term reference" to "used for long-term reference" as follows: If field_pic_flag is equal to 0, the 